Transfer Analysis Research Articles

GALERKIN FINITE ELEMENT ANALYSIS OF BUOYANCY-DRIVEN HEAT TRANSFER OF WATER-BASED CU-AL2O3 HYBRID NANOFLUID INSIDE A U-SHAPED ENCLOSURE WITH LOCALIZED HEAT

GALERKIN FINITE ELEMENT ANALYSIS OF BUOYANCY-DRIVEN HEAT TRANSFER OF WATER-BASED CU-AL2O3 HYBRID NANOFLUID INSIDE A U-SHAPED ENCLOSURE WITH LOCALIZED HEAT

Analysis of Phase Transfer of Thermal Chemicals in Linerless Thermal Labels

Analysis of Phase Transfer of Thermal Chemicals in Linerless Thermal Labels

CFD analysis of fluid flow and heat transfer in solar air heater having sinusoidal roughness

CFD analysis of fluid flow and heat transfer in solar air heater having sinusoidal roughness

Numerical Analysis of Heat Transfer and Flow Characteristics of a Precooler with a Methanol Cracking Reaction

Numerical Analysis of Heat Transfer and Flow Characteristics of a Precooler with a Methanol Cracking Reaction

Exploring intermolecular interactions in some halogen substituted formyl coumarins and their DFT studies

The present manuscript describes an in-depth analysis of various interactions present in the crystal structure of formyl coumarins using Crystal explorer 17.0. Element based interactions were quantified by the decomposition of generated 3D surfaces into 2D fingerprint regions. DFT methods were used to explore electrostatic parameters, global and local reactivity descriptors. Electrophilicity based charge transfer (ECT) analysis was done to explore the probability of charge transfer between formyl coumarins and DNA base pairs. The reactivity and selectivity of different formyl coumarins have been accessed using Fukui functions in their reduced form. Non-bonding orbital (NBO) analysis revealed the presence of various hyperconjugative interactions and their stabilization energy in formyl coumarins. Non-linear optical properties are presented in terms of first order hyperpolarizibility (β0), where maximum β0 is observed for C4 (1.64 × 10-30esu.) which is found to be 2 times greater than that of p-nitroaniline. Molecular electrostatic potential (MEP) plots are mapped in terms of electron density.

Analysis of heat and mass transfer in the manufacturing process of instant soy milk using a laboratory scale spray dryer

The events that occur during the drying include heat and mass transfer processes. So based on this, this research will discuss "Analysis of Heat and Mass Transfer in the Process of Making Instant Soy Milk Using a Laboratory Scale Spray Dryer". The research method used is the experimental method. The research that will be carried out will consist of preliminary research and main research. The purpose of this preliminary study was to determine the drying air temperature, fogging pressure, and the ratio of soy milk powder to water in solution. The best results from preliminary research are used in the main study. Data processing using technical analysis. The results showed that an increase in the drying air temperature of 80 ° C, 85 ° C, 90 ° C, 95 ° C, and 100 ° C caused a decrease in the need for drying air, namely 27.323 kg of dry air / hour to 9.840 kg of dry air / hour, time the drying of the material is shorter, namely 1 hour 10 minutes to 1 hour, the increase in thermal efficiency is 81.9% to 84.3%, and the increase in product weight coming out of the drying chamber is 3.1 grams to 4.1 grams. The results of the questionnaire showed that the panelists tended to rank taste first (65%), aroma second (61.25%), color third (47.5%).

Application of the Dorodnitsyn Transformation for Analysis of Heat and Mass Transfer in Rotating Flows

Application of the Dorodnitsyn Transformation for Analysis of Heat and Mass Transfer in Rotating Flows

Power law modeling of functionally graded Adomian’s decomposition method for thermoelastic materials in heat transfer and thermal stress analysis

This work deals with applying the iteration method for the numerical solutions of a one-dimensional thermoelastic material. The governing equations have been constructed in the context of generalized thermoelasticity with one relaxation time model of Lord and Shulman (L-S). Some properties have been considered functional graded based on power law, and the lattice design parameter has been assumed. Adomian's decomposition method (ADM) and iteration techniques have been applied to solve the governing differential equations with an algorithm method. The numerical results have been represented in figures. The numerical results affirm that Adomian's decomposition method is a successful iteration method for solving and modeling thermoelastic problems. The lattice design parameter, empirical parameter, and ratio of the material properties significantly impact the temperature increment, strain, stress, displacement distributions, where they play vital roles in transferring the thermo-mechanical waves through the thermoelastic materials.

Analysis of Fluid Flow and Heat Transfer in Corrugated Perforated Plate Fin Heat Sinks

Abstract This paper reports a mathematical model for predicting the fluid and heat flow characteristics of a Z-shaped corrugated perforated plate heat sink. Experiments were carried out to validate overall pressure drop as well as heat transfer predictions. A two-pronged approach was undertaken to design a corrugated perforated fin geometry: (a) macroscopic packaging, where the flow is distributed into conduits before being fed into perforated plates, and (b) microscopic design, where the pores are sized to maximize heat dissipation. A methodology typically used for predicting flow maldistribution is extended for packaging porous perforated plates in the macroscopic approach. An illustrative study is carried that estimates the optimum number of porous perforated plate fins that can be packaged within a given volume under fixed pressure drop constraint. In the microscopic approach, an order of magnitude analysis was carried out to decide the optimum diameter to maximize the heat transfer rate and expression for optimum diameter, and maximum achievable heat flux is proposed. Numerical simulations were carried out by considering full perforated plate porous fin geometry and single-channel geometry, and good agreement in their results was found. Finally, this study elaborates on the importance of achieving uniform flow distribution across the porous perforated plate fins.

Transient Heat Transfer Characteristics of Twisted Structure Heated by Exponential Heat Flux

This study was conducted to investigate the transient heat transfer characteristics of a twisted structure. The twisted structure was heated according to exponential function (Q=Q0×exp(t/τ), where Q0 is the initial heat generation rate, W/m3; t is time, s; and τ is the period of heat generation rate). A wide range of τ from 37 ms to 14 s was applied for the experimental study. A platinum plate with five pitches (each was 180° twisted with 20 mm in length) was used in the experiment. Helium gas with inlet temperature of 298 K under 500 kPa was used as the coolant. The heat transfer coefficient is found to increase with the decrease of τ, and the transition point was estimated to be at τ≈1s, which means that, when the increasing ratio of heat generation rate satisfies dQdt≥Q0⋅et, the heat transfer enhancement phenomenon will be observed. The response analysis for transient heat transfer at fluid-solid interface was conducted by applying the concept of penetration depth. It is considered that, when the penetration depth is smaller than the thermal boundary thickness, the heat transfer from the interface (wall surface) to the fluid domain is not fully developed during the disturbance.

Modeling Epitaxial Layer Growth from Gas Phase for Analysis of Influence of Changing Technological Process with Variation in Growth Zone Heating

Abstract In this paper, we analyze the nonstationary heat transfer during growth of epitaxial layers in epitaxy reactors from the gas phase. Based on this analysis, we formulate several recommendations on organization of heating of the growth zone for increasing homogeneity of epitaxial layers. We introduce an analytical approach for analysis of heat transfer during the growth of epitaxial layers from the gas phase. The approach gives a possibility to simultaneously take into account the nonlinearity of heat transfer, as well as changes of their parameters both in space and time.

System Of Indicators Reflecting The Process Of Innovation Transfer In Higher Educational Institutions

Technology transfer process plays an important role in the process of increasing the competitive advantage of the enterprises of the country, in the development of the country’s economy and as well in implementation of the scientific achievements to the practice. The article lists out system indicators for analysis and rational organization of innovation transfer, on the basis of application of which scientific conclusions and recommendations for further improvement of management of process are provided.

Identifying Operational Benefits of the Arrival Management System – A KPI-Based Experimental Method by Evaluating Radar Trajectories

The arrival management (AMAN) system is a decision support tool for air traffic controllers to establish and maintain the landing sequence for arrival aircraft. The original intention of designing the AMAN system is to improve the efficiency of air traffic management (ATM), but few studies are investigating the operational benefits of this system based on key performance indicators (KPIs) and evaluating actual data in a real-time environment. The main purpose of this paper is to propose a KPI based transferable comparative analysis method for identifying the operational benefits of the AMAN through radar trajectories. Firstly, six KPIs are established from a joint study of the mainstream ATM performance frameworks worldwide. Secondly, appropriate evaluation technique approaches are determined according to the characteristics of each KPI. Finally, a Chinese metropolitan airport is taken for the case study, and three periods are defined to form data samples with high similarity for comparative experiments. The results validate the feasibility of the proposed method and find comprehensive performance improvements in arrival operations under the effects of the AMAN system.

Experimental analysis of the heat transfer generated during the operation of an automotive disc brake

ABSTRACT This experimental mathematical work aims to analyse the results obtained from the heat transfer of a typical automotive disc brake and thus compare the behaviour of heat dissipation of this mechanical element under different operating conditions. The results demonstrate that the disc brakes can be used effectively in severe operational conditions with a speed of 36 km/h and an ambient temperature of 25°C, without affecting the safety of the occupants or the braking system. The use of semi-metallic pads increases the temperature over the wear track superficial temperature by around 20% more than the asbestos pad, but the material removal during sliding is around ~2.5 times more for the asbestos pad due to the coupling in the tribosystem (pad and disc brake). The heat dissipation in the disc brakes depends on the geometry of the disc, the material from which it is manufactured, the material of the pad, the weight of the vehicle, and the operating conditions, as it could be verified with the mathematical and experimental results, thus validating the contribution of the effectiveness of the braking process during its real operation.

Experimental and Numerical Analysis of Heat Transfer from a Round Jet Impinging on an Asymmetric Concave Surface

Experimental and Numerical Analysis of Heat Transfer from a Round Jet Impinging on an Asymmetric Concave Surface

Analysis of Pseudo-Homogeneous and Bulk Charge Transfer in Dye-Sensitized Solar Cells

Analysis of Pseudo-Homogeneous and Bulk Charge Transfer in Dye-Sensitized Solar Cells

BRET Analysis of GPCR Dimers in Neurons and Non-Neuronal Cells: Evidence for Inactive, Agonist, and Constitutive Conformations.

G-protein-coupled receptors (GPCRs) are dimeric proteins, but the functional consequences of the process are still debated. Active GPCR conformations are promoted either by agonists or constitutive activity. Inverse agonists decrease constitutive activity by promoting inactive conformations. The histamine H3 receptor (H3R) is the target of choice for the study of GPCRs because it displays high constitutive activity. Here, we study the dimerization of recombinant and brain H3R and explore the effects of H3R ligands of different intrinsic efficacy on dimerization. Co-immunoprecipitations and Western blots showed that H3R dimers co-exist with monomers in transfected HEK 293 cells and in rodent brains. Bioluminescence energy transfer (BRET) analysis confirmed the existence of spontaneous H3R dimers, not only in living HEK 293 cells but also in transfected cortical neurons. In both cells, agonists and constitutive activity of the H3R decreased BRET signals, whereas inverse agonists and GTPγS, which promote inactive conformations, increased BRET signals. These findings show the existence of spontaneous H3R dimers not only in heterologous systems but also in native tissues, which are able to adopt a number of allosteric conformations, from more inactive to more active states.

Transfers and orbital maintenance of spatial retrograde orbits for Phobos exploration

Quasi-satellite orbits (QSOs) are stable retrograde orbits in the restricted three-body problem that have gained attention as a viable candidate for future deep-space missions towards remote planetary satellites. JAXA’s robotic sample return mission MMX will utilize QSOs to perform scientific observations of the Martian moon Phobos before landing on its surface and attempt sample retrieval. The complex dynamical environment around Phobos makes the proximity operations of MMX quite challenging and requires novel and sophisticated techniques for maintaining and transferring between different quasi-satellite orbits. The present paper explores the application of invariant manifolds of unstable retrograde orbits to design transfer trajectories around Phobos. Starting from the equations of the Circular Hill Problem with ellipsoidal Phobos, we first compute families of three-dimensional QSOs using out-of-plane bifurcations near planar orbits. The feasibility of using unstable family members as staging orbits between high-altitude and low-altitude QSOs is later assessed. The final candidates are ranked based on MMX scientific requirements, transfer analyses, and station-keeping costs. It is found that intermediate 3D-QSOs can be maintained with as little as 1m/s per month. Furthermore, it is discovered that transfer from high-altitude QSOs to low-altitude QSOs can be executed with a total ΔV of less than 40m/s and total time of flight of less than 5 days.

Establishment and test of ‘dynamic relative area’ models for hot-metal dephosphorization and rephosphorization

ABSTRACT The kinetic models of hot-metal dephosphorization and rephosphorization have been widely used in the analysis of phosphorus mass transfer, but most of the existing models deviate greatly from the experimental results. Therefore, to reduce the deviation of traditional models in data fitting, according to the change in hot-metal phosphorus content during dephosphorization or slag phosphorus content during rephosphorization, a new dephosphorization model and rephosphatization model were established by introducing a concept of ‘dynamic relative area’, and their rationality and universality were proved. The results showed that the new dephosphorization model presents obvious advantages in the fitting accuracy of [%P]-time data, but no significant difference is observed between the new and old rephosphorization models. Besides, the RHS-time curve stability of the new dephosphorization model is much higher than that of the old model, while the RHS-time curves of the new and old rephosphorization models show little difference and remain relatively stable.

Influence of the angle and perimeter of contact of the blades in a horizontal axis aerator on the transfer of dissolved oxygen

Dissolved oxygen (DO) is a fundamental parameter in water bodies that can be supplied using horizontal axis mechanical agitators. However, blade geometry and operating conditions can influence the process cost. In this work, it is studied the effect of the perimeter and angle of impact of the blades on the water in a prototype of horizontal axis mechanical aeration, starting from the DO transfer analysis. Measurements were made on anoxic water samples using two types of blades with the same area, varying their perimeter and angle of impact. Other parameters that influence the DO transfer process were controlled in this work. The results show the increase in the perimeter, and blade impact angle with the water body, which generates a reduction in the standard aeration efficiency (SAE) up to 30 % in the process. In that way, it is obtained the best results for the prototype Type II blades with a KLa value of 3.69 h-1, and a SAE of 0.47 kgO2∙kW-1h-1 when using an impact angle of 13.5 °. In general, the geometry of the blades is a fundamental design parameter, which influences the transfer of dissolved oxygen in the water. The results of this study can contribute to improving the efficiency of these mechanical systems, reducing the energy consumption associated with oxygenation processes.