Aluminum Coil Research Articles

Performance Analysis of Aluminium and Copper Helical Coils in SHCTHE Using Cu-Ni Hybrid Nanofluid Under Laminar Flow Regime

Performance Analysis of Aluminium and Copper Helical Coils in SHCTHE Using Cu-Ni Hybrid Nanofluid Under Laminar Flow Regime

Data Analysis and Visualization of Mechanical Properties of Aluminium Coils, Focusing on Chemical Composition, Annealing Temperatures and Holding Time

Data Analysis and Visualization of Mechanical Properties of Aluminium Coils, Focusing on Chemical Composition, Annealing Temperatures and Holding Time

A CFD investigation of the design variables affecting the performance of finned-tube heat exchangers

A wide variety of heating and cooling applications use heat exchangers. The increase in energy prices, the requirement for size reduction, and restriction on greenhouse gas emissions has led to the need for finding ways to develop efficient heat exchangers. A cost-efficient way to enhance the model of a heat exchanger by visualizing the effects of the design parameters is using Computational Fluid Dynamics (CFD). The reason for this exploration was to lead an examination of the varieties/changes in the general intensity move process for a Finned-Tube Heat Exchanger (FTHE), also known as Air Coil Heat Exchanger (ACHE) with a variety of plan boundaries like the quantity of tubes, course of action of tubes, and the material utilized for the intensity exchanger. The widely used heat exchanger that uses refrigerant R314a and air as the working fluids was simulated with different design modifications. The simulated results exhibited as to how the number of tubes, arrangement of coils/tubes, material of tubes, and density / spacing of fins, effects the pressure drop, temperature and velocities profiles, and heat exchangers’ transfer of a heat. The use of copper coils improved the heat transfer by approximately 61% as compared to aluminium coils.

PENGARUH RADIASI MATAHARI DAN JENIS MATERIAL COIL PADA PV-MODULE SOLAR ELECTRIC COOKER

Global energy needs are increasing, while world energy reserves derived from fossils are dwindling. Therefore, a breakthrough is needed to develop green technology based on renewable energy, especially in the household sector. Indonesia is located on the equator so it has great potential to explore solar energy sources. This study aims to analyze the effect of the type of coil heater material and the level of solar radiation on the PV module solar electric cooker. Testing carried out in the Solar Energy Lab., Mechanical Engineering, State Polytechnic of Malang (7°56ʼ36.4ˮS ; 112°36ʼ49.6ˮE). The method used is true experimental using three material types based on their thermal conductivity, namely copper, aluminum, and nickel as well as the change in solar radiation on the heat of solar electric cooker generated by the PV module. The results showed that there was an effect of the parameters of thermal conductivity and changes in solar radiation on the heat generated by the PV module solar electric cooker. In the nickel coil test, it can reach a temperature of 769°C at a solar radiation of 875.9 W/m2. Testing the aluminum coil obtained a temperature of 191°C at a solar radiation level of 931.4 W/m2, and a copper coil could produce a temperature of 169°C at a solar radiation level of 855.6 W/m2

Analysis of the Polymer Two-Layer Protective Coating Impact on Panda-Type Optical Fiber under Bending.

The article discusses the effects of thermal-force on the Panda-type optical fiber. The studies used a wide temperature range. The research used two thermal cycles with exposures to temperatures of 23, 60 and −60 °C. The field of residual stresses in the fiber formed during the drawing process was determined and applied. Panda was considered taking into account a two-layer viscoelastic polymer coating under conditions of tension winding on an aluminum coil in the framework of a contact problem. The paper investigated three variants of coil radius to analyze the effect of bending on fiber behavior. The effect of the coating thickness ratio on the system deformation and optical characteristics was analyzed. Qualitative and quantitative patterns of the effect of temperature, bending, thickness of individual polymer coating layers and relaxation transitions of their materials on the Panda optical fiber deformation and optical characteristics were established. Assessment of approaches to the calculation of optical characteristics (values of the refractive indices and fiber birefringence) are given in the framework of the study. The patterns of deformation and optical behavior of the Panda-type fiber with a protective coating, taking into account the nonlinear behavior of the system materials, were original results.

AluCoating Chose Catalytic IR Technology to Speed up Powder Coating on Aluminium Coils

AluCoating Chose Catalytic IR Technology to Speed up Powder Coating on Aluminium Coils

Analysis of several factors influencing the effect of induction magnetic levitation

PurposeThe purpose of this paper is to analyze the characteristics of the factors influencing the effect of magnetic levitation, including the impedance angle of the levitated coil, number of turns, material parameter, frequency of excitation and geometric parameters. The final purpose is to provide approaches to increasing the levitation effect.Design/methodology/approachSome design principles and strategies for levitation systems are suggested, such as selecting the number of turns of the levitated coil, choosing the frequency of excitation considering the saturation phenomenon of levitation force against frequency and deciding the section area of the excitation coil and its ratio of height and thickness.FindingsThe magnetic force is not always repulsive in a cycle. Therefore, the key approach to increasing the levitation is to increase the period when the force is repulsive and decrease the time when attractive. The impedance angle of the equivalent circuit of the levitated coil determines the ratio of the two periods, and the larger the angle, the longer the repulsion period. A valuable finding is that a saturation situation exists between the levitation force and frequency; that is, when the frequency increases to a certain value, the increasing degree of force tends to decrease as the frequency increases.Originality/valueSome influential characteristics were found in some factors against the effect of the levitation system, which is beneficial for improving the efficiency of systems. For example, owing to the saturation phenomenon of the frequency, it is useless to continue increasing the frequency and the copper-levitated coil does not bring much greater force effectiveness than the aluminum coil.

Simulation and Experimental Methodology for Virtual Prototyping of Annealed Industrial Coils

The finite element three-dimensional transient model of the annealing process, including conductive and convective heat transfer in an aluminum (Al) coil was developed, implemented, and validated. It combines winding force dependent effective radial thermal conductivity model and the novel convective heat transfer modeling methodology. Experimental validation of the finite element model was performed for two industrial coils having different dimensions, strip thickness and crowning depth. The general agreement between the predicted and measured temperatures for most of the probes was better than 10% at the target material temperature. A series of measurements were configured and performed to supply both the input and validation data for the simulations. The effect of the additional wetted area on the convective heat transfer at the coil base was quantified. The guidelines on the virtual prototyping of the Al coil annealing process were provided, which can be of interest for the process designers.

Influence of contact pressure on the thermal contact conductance of layered metallic sheets

For the optimisation of the annealing process of aluminium coils, simulation of the process is often performed. To simulate the process with higher accuracy, reliable input parameters are required, and thermal conductivity (thermal contact conductance) is one of them. In the present study, a method to measure the thermal conductivity and thermal contact conductance of metallic sheets were developed based on the steady-state comparative longitudinal heat flow. The apparatus was built with a compression test machine, and thus it allows to control the pressure to the sample and carry out the measurements at different contact pressure. An equipped heater allows to heat the sample to 573 K. To evaluate the thermal conductance at the interface, a thermal resistance network model was applied. The measurements were carried out with an aluminium alloy (AA3003 sheets). In addition to the thermal contact conductance measurements, the surface roughness of the sheets was also investigated. The semi-empirical equation for the relationship between thermal contact conductance and contact pressure was obtained based on the measurement results.

Low Loss on a Litz Aluminum Wire Coil Using Magnetic Tape for Automotive Wireless Power Transmission

Litz copper wire (LCW) coils are used in wireless power-transmission systems in electric vehicles, which require minimal low loss and weight to reduce heat generation and improve fuel economy. In this study, we investigated magnetic tapes for low-loss and lightweight Litz aluminum wire (LAW) coils. The direct current resistance of the aluminum coil was higher than that of the copper coil; however, at 84 kHz, the alternative-current resistance was suppressed by the magnetic tape, and the weight of the LAW coil with a magnetic tape, which could reduce the resistance, was smaller than that of the LCW coil. The effectiveness of the magnetic tape in temperature reduction was clarified by the power-transmission experiment at 84 kHz. The transmission efficiency of the LAW coil with magnetic tape was improved and the temperature rise was reduced compared to the LCW coil.

Use of a Novel Polymer-Coated Steel as an Alternative to Traditional Can Manufacturing in the Food Industry

Metal containers (both food and beverage cans) are made from huge steel or aluminum coils that are transformed into two- or three-piece products. During the manufacturing process, the metal is sprayed on both sides and the aerosol acts as insulation, but unfortunately produces volatile organic compounds (VOCs). The present work presents a different way to manufacture these containers using a novel prelaminated two-layer polymer steel. It was experimentally possible to verify that the material survives all the involved manufacturing processes. Thus tests were carried out in an ironing simulator to measure roughness, friction coefficient and surface quality. In addition, two theoretical ironing models were developed: upper bound model and artificial neural network. These models are useful for packaging designers and manufacturers.

An experimental design for the control and assembly of magnetic microwheels.

Superparamagnetic colloidal particles can be reversibly assembled into wheel-like structures called microwheels (μwheels), which roll on surfaces due to friction and can be driven at user-controlled speeds and directions using rotating magnetic fields. Here, we describe the hardware and software to create and control the magnetic fields that assemble and direct μwheel motion and the optics to visualize them. Motivated by portability, adaptability, and low-cost, an extruded aluminum heat-dissipating frame incorporating open optics and audio speaker coils outfitted with high magnetic permeability cores was constructed. Open-source software was developed to define the magnitude, frequency, and orientation of the magnetic field, allowing for real-time joystick control of μwheels through two-dimensional (2D) and three-dimensional (3D) fluidic environments. With this combination of hardware and software, μwheels translate at speeds up to 50 µm/s through sample sizes up to 5 × 5 × 5 cm3 using 0.75 mT-2.5 mT magnetic fields with rotation frequencies of 5 Hz-40 Hz. Heat dissipation by aluminum coil clamps maintained sample temperatures within 3 °C of ambient temperature, a range conducive for biological applications. With this design, μwheels can be manipulated and imaged in 2D and 3D networks at length scales of micrometers to centimeters.

Discoveries in Aerosol Science: Characterization of Nanoparticles Emitted From Metallic Coils in Electronic Cigarettes

Electronic (e-) cigarettes, also known as electronic nicotine delivery systems, are battery-operated devices that are growing in popularity worldwide. Although e-cigarettes are known to be safer than traditional cigarettes, their potential health risks have not been extensively reviewed yet. In this study, aerosol nanoparticles generated from e-cigarette heaters were characterized. Kanthal A1 (iron + chromium + aluminum) coils, without nicotine solution or a wick, were installed in an e-cigarette atomizer. The operating conditions were varied coil resistances (0.1–1.0 Ω), a set applied power (10 W), and a stable duty cycle (50%: 5 s on, 5 s off ). The size distribution and morphology of particles were collected by a scanning mobility particle sizer and evaluated by transmission electron microscopy, respectively. From an applied power of 10 W and a 50% duty cycle, the size and total number concentration (TNC) of particles emitted increased with greater coil resistances. Within these operating conditions, the average TNC of particles generated exhibited a steep decrease during the first 15 minutes of each trial. The TNC of particles decreased over time because surface oxidation (iron oxide layer) prevented further nanoparticle emission. As a result, a used coil may reduce the risk of the metal exposure from e-cigarettes. The results indicate that our designed and tested e-cigarette generation system is useful for future research that aims to investigate the health impacts of metallic particle inhalation on e-cigarette users.

Influence of Contact Pressure on the Thermal Contact Conductance of Layered AA3003 Aluminium

For the optimization of the annealing process of aluminium coils, simulation of the process is often performed. To simulate the process with higher accuracy, reliable input parameters are required and the thermal conductivity (thermal contact conductance) is one of them. In the present study, the thermal conductivity and thermal contact conductance of AA3003 alloy sheets were measured by a steady state comparative longitudinal heat flow method at different contact pressure. To evaluate the thermal conductance at the interface, thermal resistance network model' was applied. In addition, the surface roughness of the sheets was also investigated. Based on the measurement results, the semi-empirical equation for the relationship between thermal contact conductance and contact pressure was obtained

Design and construction of an industrial ship conditioning system

This project is based on the design and construction of an industrial air conditioning system for the improvement of the working thermal comfort of workers that for various reasons there is the trend of the increase in body temperature are these by machines, equipment or the same work activities, which affects the productive performance and possible health risks. During development, the selection of mechanical equipment such as the fan, water pump, ventilation transport ducts is studied with high rates of energy efficiency. In the light of the above, the environmental economic partner alternative is chosen to implement the evaporative conditioning system, conducive to working in open places to lower the temperature by labor and technology installed in the production areas, as well as the extraction of fumes derived from production processes. The importance of the evaporative conditioning system is to derive the appropriate mechanisms to take advantage of the surface heat transfer of a panel and copper and aluminum coil using water, and thus take advantage of its temperature differential reaching 25oC, with an average humidity of 66% and energy consumption of 0.29 KW/h.

High-Speed Humanoid Robot Arm for Badminton Using Pneumatic-Electric Hybrid Actuators

We describe the development of a robot configured to play badminton, a dynamic sport that requires high accuracy. We used pneumatic-electric hybrid actuators, each combining a pneumatic actuator, with high-speed and lightweight attributes, and an electric motor with good controllability. Our first objective was to develop hybrid actuators that are lightweight and compact and with integrated sections. Using parts made of lightweight materials such as plastics and aluminum coils, and using wire for power transmission, we made actuators much lighter and smaller than previous ones. In addition, for high accuracy and power, tension sensor units and a heat countermeasure mechanism were also incorporated. As practice partners, we consider badminton robots to be more useful if they were humanoid in appearance and have a variety of shots. We, therefore, developed a humanoid robot arm. By incorporating actuators as link structures, the overall weight was reduced, and both complex degrees of freedom (DoFs) and a large range of motion were realized. Subsequently, we developed a robot with seven DoFs, three DoFs for the shoulder, two for the elbow, and two for the wrist, similar to the configuration of human arms. The robot, therefore, roughly reproduces human movements. At 19 m/s, the maximum speed of the racket was quite fast. The hybrid control reduced the motion variance, allowing improvements in accuracy of more than three times that of motions with only pneumatic control. In addition, performing path planning and tracking control with high precision was possible, tasks that are difficult for conventional pneumatic dynamic robots.

Cooling Aluminium Coils by Outdoor Air

Cooling Aluminium Coils by Outdoor Air

Mechanical properties and residual stresses in cold-rolled aluminium channel sections

In recent years, aluminium alloys have been paid more attention in the construction industry due to their attractive attributes such as light mass, high strength, easy recycling and high corrosion resistance. Traditionally, aluminium alloy sections used for structural applications have been formed by extrusion. Until recently, structural aluminium C- and Z- sections have been successfully cold-rolled from aluminium coil using existing rolling systems for cold-formed steel sections. During the cold-rolling process, plastic deformation at the corner regions results in strain hardening and associated enhancement of the yield stress. Also, the cold-rolling process may generate residual stresses around the cross-sections affecting the structural behaviour of members. It is therefore necessary to determine the mechanical properties and residual stresses caused by the cold-forming process. This paper describes an experimental program carried out at the University of Sydney to thoroughly investigate the distributions of mechanical properties and residual stresses throughout the cross-sections of cold-rolled aluminium C-sections. The experimental results provide an understanding of the magnitude and distribution of mechanical properties and residual stresses in cold-rolled aluminium sections, which are found to be different from those in cold-rolled steel and stainless-steel sections. Based on the experimental findings, the longitudinal membrane residual stresses are very small up to approximately 3% of yield stresses and may be neglected, whereas the longitudinal bending residual stresses are measured up to 30% of yield stresses.

Life Cycle Assessment of Electrical Distribution Transformers: Comparative Study Between Aluminum and Copper Coils

Abstract Environmental impacts of electrical transformer manufacturing vary according to transformer power distribution capacity and metal type used in coil manufacture. 75 Kilovolt-ampere (kVA) tr...

Industrial application of a quick, non-destructive anisotropy characterisation method

Centerless X-ray diffractometers are specially designed for non-destructive residual stress measurement. The residual stress, and the crystalline anisotropy are induced by elastic deformation and are stored within the crystal structure. The similarity between residual stress and pole figure measurement led to the idea of developing the texture test method for centreless diffractometers. After the determination of identical lattice plane series distribution that can be measured with centreless and conventional diffractometers, advanced anisotropy measurements techniques were invented. In some cases, to characterize the sample from the aspect of crystalline anisotropy it is enough to make measurements in the specific directions (e.g. χ cuts in the rolling, cross and diagonal direction). With our centreless X-ray diffractometer, we managed to measure a χ cuts in the rolling direction under two minutes without sample cutting. The implementation of this non-destructive technique into the production line can be possible, consequently monitoring of the texture evolution even on industrial-sized aluminium coils. In this paper we compare the conventional X-ray diffraction measuring technique with our developed method on the example of a cold rolled aluminium sheets at different reductions.