Study Of Heat Transfer Problems Research Articles

Thermal analysis of radiated (aluminum oxide)/water through a magnet based geometry subject to Cattaneo-Christov and Corcione’s Models

The study of heat transfer problems is of paramount significance due to their wider spectrum of applications specifically in heat engines, insulation, chemical and thermal engineering etc. The formulation of new model completed via enhanced nanofluid properties and under physical parameters and then in-depth mathematical investigation done via numerical approach and scrutinized the results for preeminent physical parameters. Thermal conductivity estimation under Corcione’s model increased by taking the particles concentration up to φ=0.6% and electrical conductivity diminishes from 0.999001 to 0.994036. Further, the eye bird analysis of the results revealed that the stretching number S1 from 0.1 to 1.3 and α2=0.1,0.2,0.3,0.4 resists the fluid flow over the surface and the nanofluid movement is slow compared to conventional liquid due to high viscous forces. Keeping the concentration φ% and Ha=0.1,0.2,0.3,0.4 the velocity G'(η) drops and it rises for increasing S1. Furthermore, the addition of radiative thermal flux (Rd) and internal heating effects (Hg) in the model increase its applicability for high thermal transport applications and is observed maximum for nanofluid. The local thermal rate at the surface could be enhanced by keeping Rd and Hg from 0.0 to 0.8 and minimal rate of heat transport is observed for simple fluid while it is dominant for nanofluid.

Numerical Study of Natural Convection in Square Cavity with Inner Bodies Using Finite Element Method

A numerical study of heat transfer problem by natural convection of a fluid inside a square cavity with two inner bodies is presented. This subject is of great interest in the engineering area, mainly in applications involving development of heat exchangers and cooling or heating systems of bodies by natural convection mechanism. Two cases have been studied. The inner bodies are square in case 1 and circular in case 2. In both cases, the bodies are solid and thermally conductive, the cavity lower and upper horizontal surfaces are isothermal with high temperature Th and low temperature Tc, respectively. Both vertical surfaces are adiabatic. A FORTRAN code using Finite Element Method (FEM) is developed to simulate the problem and solve the governing equations. The distributions of stream function, ψ, dimensionless temperature, θ, and vorticity, ω, are determined. Heat transfer is evaluated by analyzing the behavior of the average Nusselt number. The Grashof number and thermal diffusivity ratio are considered in range from 2 × 104 to 105 and from 0.1 to 100, respectively. The fluid is air with Prandtl number fixed in 0.733.

Interactive software application for calculation of non‐stationary heat conduction in a cylindrical body

AbstractIn this paper we present software application used for the study of heat transfer problems that is a part of education of subject Process Engineering taught at the Tomas Bata University in Zlín. The application speeds up calculation of non‐stationary heat conduction and visualizes temperature distribution in the cylindrical body. © 2010 Wiley Periodicals, Inc. Comput Appl Eng Educ 21: 89–94, 2013

Testing the computer assisted solution of the electrical analogy in a heat transfer process with a phase change which has an analytical solution

A new method has been developed for the computer assisted solution of electrical analogies. The method, relatively simple in comparison with other methods, allows the study of heat transfer problems, including the change of phase. The aim of this work has been to apply this technique to the study of a heat transfer problem with change of phase, which has an analytical solution, in order to test its validity. The results obtained by both methods, analytical and analogical, are compared, and they are observed to agree satisfactorily. It makes it possible to establish that the technique developed is suitable for the study of processes with a phase change present.

A New Method of Heat Transfer Coefficient Measurements by Liquid Crystal and Digital Processing

In the last ten years liquid crystals have emerged as reliable temperature sensors for heat transfer research, and have been applied in a number of situations to visualize temperature distribution under complex flow fields. In this study, the true-colour image processing of the liquid crystal has been successfully applied to the study of heat transfer problems. A new procedure has been developed (this involves a colour scale representation of the local contours of local Nusselt number) to obtain an average Nusselt number using the Hue ratio coefficient (ratio of the number of pixels for the hue range considered to the total number of pixels of a certain area).