Corrugation Shape Research Articles

Investigating the influences of the geometry and orientation of corrugation in the steel shear walls on the cyclic behavior through the use of finite element analysis

To dampen the loading sequences in the constructions, using the shear walls is recommended. Shear walls, which withstand the lateral forces (i.e., parallel to the plane of the wall) of wind and seismic activity, prevent buildings from collapsing while columns and load-bearing walls support the structure’s compression load all the way to the foundation. Besides, some new techniques are innovated for strengthening the structure like outrigger system. The steel shear walls are mostly used in the steel structures due to their high strength, ductility, and low weight. Recently, implementing Corrugated Steel Shear Walls (CSSWs) has gained more attention because they can absorb much amount of energy compared to flat steel shear walls. There are two important parameters in the CSSWs that play crucial roles in controlling their strength; corrugation geometry and orientation. Therefore, the current research paper aims to study numerically the effects of four corrugation geometries (trapezoidal, square, zigzag, and curved) with two orientations on the cyclic behavior of the CSSWs. Finite Element Analysis (FEA) is used to simulate the seismic loading conditions and finally, this procedure is validated through the comparison of the modeled flat shear wall with the experimentally published results. The difference between the peak loads of hysteresis curves obtained numerically and experimentally is about 8.5%. The stated FEA procedure in this paper can be regenerated by other researchers. The results confirmed the applicability of the CSSWs compared to the flat shear walls. Also, the vertical corrugation infill patterns result in higher strength in comparison to the horizontal ones. For instance, in the zigzag and square corrugation shapes, the plastic energy dissipation of the vertically oriented specimens (13.84 and 14.01 KJ, respectively) is higher around 7% and 29%, respectively than the horizontally oriented ones (12.9 and 10.84 KJ, respectively). Besides, the trapezoidal and curved corrugation geometries show the highest cumulated energy and plastic energy dissipation.

Effect of Baffle Board on Aerodynamic and Stealth Performance of Double S-Duct Caret Intake

Intake is not only the main air supply component of an aircraft, but also one of the forward radar scattering sources. The aerodynamic and stealth performance of intake is critical to the serviceability of advanced fighter aircrafts. The effects of baffle boards with different configurations on the performance of the caret intake with a double S-duct diffuser are presented in this article. The multi-level fast multipole method (MLFMM) and the SST k-ω turbulence model were respectively used to calculate the surface current and the flow field. It was found that the average RCS value of intake can be effectively reduced by installing the baffle board with vertical orientation in the front diffuser, with the DC60 value and the loss of outlet total pressure both increased slightly. The boundary layer separation and the RCS characteristics of intake were closely related to the configuration of the corrugated baffle board. Compared with the traditional curved board, by installing the corrugated board with optimized corrugation number and shape, the stealth performance of intake can be further improved, and the loss of aerodynamic performance can be also reduced.

Structural design and adaptive tracking control of automatic welding robot for liquefied natural gas containment system

Liquefied natural gas (LNG) is commonly transported by LNG carriers and stored in cargo containment systems. The primary barrier of the MARK III cargo containment system is welded to a closed space with corrugated stainless steel plates. To meet the requirements of excellent sealing and thermal insulation for cargo containment, the welding process of the corrugated plate need to be strictly controlled, which poses a challenge to the development of related welding equipment. In this paper, we present a new five-axis automatic welding robot system used for plasma arc welding on corrugated surfaces. The moment transfer scheme of the dual linkage mechanism makes the rotary movement of the robot more accurate and stable which gives the system with simpler control algorithm and better overall force characteristics. To ensure tracking accuracy, a novel sensing method based on a LASER sensor, two contact sensors, and an angle sensor is proposed to implement multiple functions such as tracking the welding arc length, identifying corrugation shapes, and detecting welding gun posture. Based on the devised tracking sensor system and welding robot, a servo-control system with a surface-tracking welding control algorithm is established. The experimental results show that the robot system's welding speed is about 7 times that of hand welding and the welding qualification rate was 99%, significantly improving welding efficiency and quality as a critical equipment technology in the process of corrugated plate welding.

Global stability design of concrete-filled corrugated steel tubular columns

In recent years, various types of concrete-filled steel tubular (CFST) columns were proposed and they have been widely used in engineering practice. Considering the great confinement effect of corrugated steel plate on the concrete, a novel type of CFST column called concrete-filled corrugated steel tubular (CFCST) column was proposed. The CFCST column consists of horizontally corrugated steel plates, corner steel bars and infilled concrete. In this paper, the stability performance of CFCST columns is studied. Firstly, a finite element (FE) model was developed for numerical simulation. The ultimate resistances, load-displacement curves and failure modes obtained from the FE models were compared with previous test results to verify the validity of the FE model. Subsequently, seven sets of numerical examples were analyzed to investigate the impact of key parameters on the global stability performance of CFCST columns. These examples involved variations in geometric dimensions, corrugation shapes and material strengths. Finally, the stability coefficients φ of CFCST columns obtained from FE numerical simulation were compared to several existing stability curves. On this basis, a new stability curve was proposed for predicting the global stability resistance of CFCST columns with good accuracy and reasonable redundancy.

Linear stability of the viscous liquid flow in a channel with corrugated walls

Using the complete Navier-Stokes equations, we investigate the linear stability of a viscous flow in a channel with various corrugated walls. We consider both the longitudinal corrugations when the main flow has two velocity components and the transversely corrugated wall when the basic flow has one velocity component. In frame of one approach and in a wide range of variations in the corrugation parameters and shapes, we analyze the neutral curves for the linear stability problem. We calculate the critical Reynolds number above which the main flow is unstable and there are disturbances growing in time. Perturbations of the velocity and pressure fields are, in general, three-dimensional with two wave numbers. We solve numerically the generalized eigenvalue problem. In the case of the transversely corrugated wall, we obtain two regions of parameters where the dependencies of the critical Reynolds number on the corrugation parameters are qualitatively different. The limits of these regions depend only on the ratio of the amplitude and period of corrugations. In the case of the longitudinal-corrugations, we find the corrugation parameters where the basic flow is unstable with respect to the periodic disturbances with the same wavelength as the corrugations wavelength and undergoes “the unavoidable transition” to a flow with more complicated behaviour in time.

Shear force distribution mechanism of perfobond leiste connectors in joint between corrugated steel web and concrete top slab

Compared to composite bridges with flat steel webs (FSWs), the corrugation shape and significant shear deformation of the steel web in composite bridges with corrugated steel webs (CSWs) will influence the distribution and magnitude of the shear force of connectors in the joint between the steel web and concrete slab. However, these effects have not been considered in current design specifications, which may lead to unsafe designs. This paper investigates the shear force distribution mechanism of perfobond leiste (PBL) connectors in the joint between the CSW and concrete top slab in composite bridges with CSWs. The theoretical solution for the shear force of the joint per unit length is firstly derived based on the elastic bending theory considering the shear deformation of the CSW. Then, finite element simulations using hybrid models of solid and spring elements are conducted to further investigate the shear force distribution of PBL connectors and influencing parameters. The results show that the shear deformation of the CSW has a negligible effect on the shear force of the joint per unit length. In contrast to composite bridges with FSWs, the CSW induces sinusoidal variations in the shear force of PBL connectors, which leads to an increase in the shear force of partial PBL connectors. The amplification factor for the shear force increases with the wavelength of the CSW and the shear stiffness of the PBL connector, while it decreases with the increasing dimensions of the steel upper flange, perforated ribs, and hole spacing. Finally, a calculation formula and corresponding procedure are proposed for predicting the shear force of PBL connectors in the joint between the CSW and concrete top slab for composite bridges with CSWs.

Review of Developments in Plate Heat Exchanger Heat Transfer Enhancement for Single-Phase Applications in Process Industries

A plate heat exchanger (PHE) is a modern, effective type of heat transfer equipment capable of increasing heat recuperation and energy efficiency. For PHEs, enhanced methods of heat transfer intensification can be further applied using the analysis and knowledge already available in the literature. A review of the main developments in the construction and exploration of PHEs and in the methods of heat transfer intensification is presented in this paper with an analysis of the main construction modifications, such as plate-and-frame, brazed and welded PHEs. The differences between these construction modifications and their influences on the thermal and hydraulic performance of PHEs are discussed. Most modern PHEs have plates with inclined corrugations on their surface that create a strong, rigid construction with multiple contact points between the plates. The methods of PHE exploration are mostly experimental studies and/or CFD modelling. The main corrugation parameters influencing PHE performance are the corrugation inclination angle in relation to the main flow direction and the corrugation aspect ratio. Optimisation of these parameters is one way to enhance PHE performance. Other methods of heat transfer enhancement, including improving the form of the plate corrugations, use of nanofluids and active methods, are considered. Future research directions are proposed, such as improving fundamental understanding, developing new corrugation shapes and optimisation methods and area and cost estimations.

Gravity-driven film flow inside an inclined corrugated pipe: An experimental investigation of corrugation shape and tip width

Fluorescence images were acquired in gravity-driven film flow through inclined corrugated pipes representing a range of corrugation shapes and tip widths. The film flow developed an identifiable statically deformed free surface with a wavelength similar to the substrate for most cases of corrugation shape and tip width. The amplitude and phase shift of the statically deformed free surface, as well as the steady-state film thickness, varied more with tip width than with corrugation shape. Transient fluctuations in the free surface elevation were examined for evidence of periodic traveling waves. In general, the film flow produced transient free surface fluctuations, and in many cases, periodic traveling waves with parameters that varied similarly with corrugation shape as with tip width. For flow conditions that produced positive phase shift, low amplitude, or minimal curvature of the statically deformed free surface, transient and periodic behavior were suppressed, supporting previous findings on the importance of the shape and position of the statically deformed free surface. An increase in corrugation tip width also reduced the transient and periodic response. These two findings implicate flow dynamics in the substrate trough as a leading factor in the development of transient and periodic behavior. Steady-state response and the existence of time-dependent behavior are influenced more by tip width than corrugation shape, in agreement with two-dimensional film flow over topography; however, transient fluctuation and periodic traveling wave parameters are similarly influenced by corrugation shape and tip width, which contrasts two-dimensional findings.

Numerical study on novel airfoil corrugated plate heat exchanger: A comparison with commercial type and geometrical parameter analysis

• Symmetric airfoil is used for PHE design for the first time. • CFD simulation is validated with a previous experimental. • New type of PHE has less pressure drop than commercial type while maintaining the same amount of heat transfer. • Effects of geometrical parameters of plate heat exchanger on performance was numerically studied. • Airfoil PHE is a potential alternative to commercial type. Utilizing an effective corrugation shape in plate heat exchanger (PHE) results in a substantial increase in thermal performance and a more compact design for these devices. This article presents, for the first time in the literature, an innovative PHE design that employs symmetric airfoil profile corrugation (airfoil corrugated PHE). As a consequence of the airfoil corrugation, unique flow channel is formed inside the PHE, which results in lower pressure drop while maintaining the equivalent heat transfer rate as the commonly used commercial sinusoidal PHE. In order to get a comprehensive understanding of the performance of airfoil corrugated PHE, essential parameters such as corrugated angle, corrugated pitch, mirror arrangement, and airfoil profile were examined over Reynolds number ranges of 4,600–8,400. Compared to sinusoidal corrugation, the innovative PHE has roughly 17% reduced pressure drop while keeping the same amount of heat transfer, as determined by a computational analysis of thermal and hydraulic parameters. 60° was the optimal corrugated angle, demonstrating a 10% increase in overall heat transfer coefficient (OHTC) compared to both 30° and 90°. In addition, the NACA 0030 airfoil profile obtained the highest thermal performance, with an OHTC that was roughly 12% greater than that of the NACA 0020 and NACA 0025 profiles. Nonetheless, as one of the geometrical parameters changes, the pressure drop is proportionate to the increase in heat transfer. NACA 0030 saw a pressure drop increase of around 33.7%, the greatest of any case. The geometrical parametric study indicates that the ideal configuration of the innovative PHE consists of NACA 0030 airfoil profile, chevron angle of 60° degrees, single mirror arrangement, and corrugated pitch of 3.14 mm, as shown by the maximum performance of evaluation criterion (PEC) value of 1.08.

Effect of Corrugated Sheet Diameter on Structural Behavior under Cryogenic Temperature and Hydrodynamic Load

The most important technical issue in the shipbuilding industry regarding liquefied natural gas (LNG) carrier cargo containment systems (CCS) is securing the structural reliability of the primary barrier, which is in direct contact with the LNG. Fracture of the primary barrier by the hydrodynamic load of the LNG CCS may lead to disasters because it is difficult to implement immediate safety measures in the marine environment, unlike on land. Hence, structural reliability of the LNG membrane is the most critical issue in LNG carrier CCSs, where thin and corrugated 304L stainless steel is often used as the primary barrier to prevent repeated thermal deformation from the temperature difference during loading (−163 °C) and unloading (20 °C) of the LNG. However, plastic deformation of the 1.2 mm-thick corrugated membrane of the LNG CCS has been reported continuously owing to its vulnerability to cryogenic hydrodynamic loads. In the present study, we conducted a parametric analysis to investigate the effects of the corrugation shape as a preliminary study of the primary barrier. Finite element analysis was conducted with a simplified plate to focus on the effects of corrugation. Furthermore, a two-step validation was conducted using the above experimental results to ensure reliability of the structural analysis. The results show that optimizing the corrugation shape could ensure better structural safety than the conventional design.

Evaluation of a novel semicircular locking external fixator for treating fractures of long bones: Biomechanical comparison with a circular external fixator

PurposeThis study aimed to investigate the biomechanical properties of a novel semicircular locking external fixator with locking screw mechanism, shape of trapezoidal corrugations, half- ring designed for greater stability. Materials and methodsThe novel external fixator had a half-ring with the shape of trapezoidal corrugations and locking screws fixing the bone at different angles in all three planes (sagittal, axial, and coronal). The biomechanical properties of the semicircular locking external fixator (group 1) were compared with those of a standard Ilizarov-type circular external fixator (group 2) (TST, İstanbul, Turkey) in an experimental study design. Five frames were used in each group. Standard PE 1000 (polyethylene) rod models (n = 10) simulating the tibia bone model were used. Both systems were compared biomechanically by applying axial and torsional loads simultaneously. ResultTwo samples in group 2 were damaged before the test ended during axial loading. All of the samples in group 1 completed the tests without damage after 150,000 cycles. The axial stiffness of the semicircular locking external fixator was found to be significantly higher than that of the Ilizarov-type circular external fixator (p < 0.05). No statistically significant difference was found between the two fixators in torsional loading. The application time of semicircular locking external fixator was significantly shorter than Ilizarov-type circular external fixator (p < 0.05). ConclusionThe novel semicircular locking external fixator was biomechanically stronger than the Ilizarov-type external fixator for treating fractures of long bones. It can be used as a permanent external fixator for the definitive treatment of long bone fractures with soft tissue damage in terms of stability and application time.

Numerical study of the flange buckling behavior of trapezoidally corrugated web girders

Trapezoidal corrugated web steel plate girders (TCWPGs) are heavily considered as advanced structural elements in the structural engineering branch due to their many advantages. However, not many researchers focused on studying the calculation of the capacity of these girders under bending moment and the bending behavior of these girders when it fails by flange local buckling of the slender compression flange. In this paper, an intensive parametric study has been performed on trapezoidal corrugated web girders subjected to pure bending moment to investigate and analyze the flange local buckling coefficient. Flange slenderness ratio, web slenderness ratio, flange-to-web thicknesses ratio and the trapezoidal web enclosing effect were investigated numerically to study and analyze their effect on the coefficient of local flange buckling in this type of girders. Also, bending moment resistance of these girders has been studied. The behavior of these girders has been investigated using ABAQUS FE software. A criterion of the Egyptian code for classifying the compression flanges has been found to be suitable to be used for studying the effect of web thickness on the bending moment resistance of trapezoidal web girders. Depending on the shape of the web corrugations, it is specified if the compression flange slenderness should be depending on the average outstand distance or the maximum outstand distance. Also, some important advices have been introduced for the economic and safe design of these girders to be taken in designers’ consideration. Ultimately, a new design procedure has been deduced to present a classification limit for non-compact compression flanges in plate girders with trapezoidal corrugated web.

Effect of corrugation structure and shape on the mechanical stiffness of the diaphragm

Here, we studied the change in the mechanical stiffness of a diaphragm according to the corrugation pattern. The diaphragm consists of a silicon oxide and nitride double layer; a corrugation pattern was formed by dry etching, and the diaphragm was released by wet etching. The fabrication of the thin film was verified using focused ion beam and scanning electron microscopy images. The mechanical stiffness of the diaphragm was obtained by measuring the surface vibration using a laser Doppler vibrometer while applying external sound pressure. Flat squares, diaphragms with square corrugations, and circular corrugation patterns were measured and compared. The stiffness of the diaphragm with a corrugation structure was found to be smaller than that without a corrugation structure; in particular, circular corrugation showed a better effect because of the high symmetry. Furthermore, the effect of corrugation was theoretically predicted. The proposed corrugated diaphragm showed comparable flexibility with the state-of-the-art MEMS microphone diaphragm.

Effect of stress and groove geometry on the performance of an IBG filter with Si3N4-filled corrugations

We design and estimate the performance of an integrated Bragg grating (IBG) filter that has Si3N4-filled periodic grooves on a silicon strip waveguide. Also, the entire IBG filter is covered with Si3N4 cladding. The refractive index variation along the length of the filter is achieved by the periodic Si3N4-filled corrugations. We consider different geometries of grooves that can be other than the ideal rectangular shape as a result of fabrication limitations. Moreover, we also include the stress-optic effect, which arises because of the different thermal expansion coefficients and lattice constants of the core and cladding materials, to estimate filter performance. We categorically estimate the impact of groove geometry and the stress-optic effect on the filter performance—namely, resonance wavelength, bandwidth, extinction ratio, and side-lobe suppression ratio. Also, the effects of varying the waveguide width, cladding thickness, and corrugation depth on the optical performance of the proposed filter is studied. Our numerical studies reveal that a larger magnitude of stress can be found for lower waveguide width, lower cladding thickness, lower corrugation depth, and rectangular corrugation shape. The estimated changes in the resonance wavelength, bandwidth, extinction ratio, and side-lobe suppression ratio due to the stress effect and geometrical variation of the groove for the IBG filter designed with a waveguide width of 300 nm (600 nm), cladding thickness of 100 nm (400 nm), and rectangular corrugation depth of 10 nm (50 nm) are 1891 pm (1593 pm), 21% (3.8%), 27.2% (5.5%), and 26.9% (5.4%), respectively. The significant performance variation in the IBG filter due to stress and groove shapes emphasizes the need to address these factors to estimate the performance of the proposed IBG filter.

Nonlinear dynamic analysis for a corrugated thin film on a pre-strained finite-thickness bi-layer substrate

To improve the robustness of the film/substrate-type stretchable electronics, an intermediate layer has been adopted in their design in recent years. However, the intermediate layer could significantly influence the static and dynamic behaviours of the tri-layer structure (film/intermediate layer/substrate structure). In this paper, considering the shear stress between the film and intermediate layer and the deformation of the intermediate layer and substrate layer, and accounting for the corrugation shape of the film, an improved theoretical model of the tri-layer structure is established and the buckling behaviour of the tri-layer is studied to obtain static buckling amplitude and wavelength. Then, the governing equation of motion of this structure (using the theory of corrugated beam for the buckled film bonded on a finite-thickness bi-layer substrate) is derived, based on the geometrical homogenization theory and the Lagrange equation. By using the numerical results of buckling analysis and the Jacobi elliptic function, the analytical nonlinear frequency of the tri-layer structure with corrugated film is obtained. Finally, numerical examples are analysed to reveal the influences of the Young's modulus and thickness of the intermediate layer on the nonlinear frequency of the corrugated tri-layer structure. From these results, it is concluded that when the thickness of the intermediate layer is hundreds times greater than that of the stiff film (which is the dimension of the current typical design), with the increase of the intermediate layer's Young's modulus, the nonlinear frequency of the tri-layer structure decreases. However, when the intermediate layer is thinner than the film, the nonlinear frequency is independent of the intermediate layer's Young's modulus, which implies that the tri-layer structure degenerates into a bi-layer (film-substrate) structure. These results are helpful for the design of reliable film/substrate-type stretchable electronic devices.

Experimental study of encased composite corrugated steel webs under shear loading

This paper focuses on enhancing the shear strength of steel I-girder using different types of corrugation filled by concrete. This study used three types of corrugation shape (triangular, trapezoidal, and rectangular). Corrugation shapes had the same depth (60 mm). All specimens used in the study had equal weight, which is approximately (38) kilograms per specimen. The specimens were categorized into two groups, the first group without encasing by concrete while the second group contains self-compacted concrete to encase the corrugated steel web for two faces of I-girder. The experimental work included measuring the ultimate load capacities and load -deflection curves . The experimental results showed that the concrete filled corrugated web girders have high shear strength compared to the specimens that don’t have concrete encasing. Also, the shape of the corrugation was found to have an impact on the shear strength of the steel girders encased with concrete.

Structural design and mechanical characterization of an auxetic advanced grid structure composite

The structural design, manufacture and mechanical evaluation of an auxetic advanced grid structure (AGS) composite were investigated. The mechanical behavior of the auxetic AGS composite under the compressive loading was simulated via finite element method (FEM). The auxetic AGS composite was fabricated via autoclave processing, and the processing quality and mechanical properties were evaluated. The simulation results show that the auxetic AGS composite after deformation is in a corrugation shape, which is different from the saddle deformation shape of the orthogonal AGS composite. Compared with the orthogonal AGS composite, the transverse expansion is lower and the stress is more uniformly distributed. An 30° included angle between grid and axis is the most optimal structure for the auxetic AGS composite. Excellent manufacturing quality and superior mechanical properties are found for the MT300/603 carbon fiber/epoxy auxetic AGS composite. The mechanical experiment results show the optimal MT300/603 auxetic AGS composites have a compression modulus of 65.92 GPa and a compression failure load of 64.65 kN. The failure occurs between the grid and skin at the crossing of the grids, showing a higher compression strength than the orthogonal AGS composite. The optimal MT300/603 auxetic AGS composite exhibits a characteristic negative Poisson’s ratio. The AGS composite structure with superior overall mechanical performance can potentially be used on aerospace structures.

Shear Behaviour of Steel Girder with Web-Corrugated Core Sandwich Panels

Last few decades, corrugated web steel girders have the foremost widespread and used steel constructions due to their lightweight and high load carrying capacity compared with the stiffened flat web. This study aims to comprise an experimental work by testing ten specimens to improve the girders shear resistance. One reference specimen with a flat web in addition to nine models that are categorised to three groups in which each group differs in the corrugation shape. Rectangular, trapezoidal and triangular corrugation shapes of different heights (20, 40, and 60 mm) were utilised. All specimens used in the study have equal weight, which is approximately 30 kilograms per specimen. The experimental work included measuring the ultimate load capacities and load-deflection curves. Results showed that different failure modes were observed for those beams. It was also found that the beam with trapezoidal corrugation web has an increase in its strength by nearly 28% compared with the reference beam.

Properties of a multi-layer multi-span corrugated package

In this article we deal with the problem of cyclic compression of a multilayer multi-span corrugated package by using the finite element method (FEM) and a three-dimensional model (3-D model) of deformation in Ansys. We take into account plastic deformation of the package, as well as the complex law of its propagation and mutual elastic slippage with dry friction over tops of corrugation and in local regions at the tops of corrugation along the package tapes, valid for any geometrical shape of corrugation. This solution can be considered as the second part of the general complex nonlinear problem of cyclic compression of a multilayer multi-span corrugated package with dry friction on contact surfaces. The solution obtained makes it possible to construct any loading processes in the field of elastic-hysteresis package loops. The comparison of elastic-frictional characteristics of the package (EFCs) obtained by calculation and the experimental ones showed their good agreement. The influence of the corrugated package parameters on its EFCs was studied. A number of properties of the package were determined allowing us to draw conclusions and formulate recommendations that make it possible to define the number of package tapes, the required accuracy in the manufacture of corrugations of its tapes, and the choice of the geometric shape of corrugations in almost all cases of practical use of corrugated packages. The solution obtained can be used to determine the effectiveness of a bumper and other protective devices during crash tests of a car for frontal and side impacts and to determine the optimal parameters of these devices by calculating. Certain results and recommendations of this paper can be useful for the calculation of parameters of damping elements of a blisk, hollow wide-chord blades of aircraft GTE fans, ring dampers of rocket engine rotors, as their damping elements are made in the form of multilayer, multi-span corrugated packages.

Effect of surface corrugation on cooling capacity of ceiling panel

In this paper surface corrugation as a method of capacity enhancement of ceiling panels is presented. The triangular corrugation shape was analyzed. Influence of corrugation length L and corrugation angle β on panel cooling capacity was investigated theoretically. The calculation model was validated experimentally. In calculations the range of corrugation length L was from 30 mm to 120 mm, and the range of corrugation angle β was from 30° to 180°. In experiments the values of the above parameters were: L = 0.04 m, β = 90°, and β = 180°. A special cuvette-type-laboratory panel was used to obtain nearly uniform temperature distribution at the entire cooling surface. The width and length of the laboratory panel were 380 mm and 1502 mm, respectively. The panel surface emissivity was ɛ = 0.9. Calculations have shown that in the typical room conditions the cooling power of the panel with small values L = 30 mm and β = 30° can achieve even 121 W/m2 and it can be up to 90% higher than the specific power of a reference panel with a flat surface. For geometry more desirable from an operating point of view: L = 40 mm and β = 90°, both experimental and theoretical results have shown that the cooling power of the corrugated surface increased by 15÷20% compared to a traditional flat surface. A physical interpretation of the regularities found is presented.