Heat Transfer in Solid Bodies

2020 ◽  
pp. 21-45
Author(s):  
Vladimir Vavilov ◽  
Douglas Burleigh
Keyword(s):  
Heat Transfer ◽  
Solid Bodies

scholarly journals Conjugate heat transfer numerical study of the ejector by means of SU2 solver

2021 ◽  
Vol 2088 (1) ◽  
pp. 012004
Author(s):  
D V Brezgin ◽  
K E Aronson ◽  
F Mazzelli ◽  
A Milazzo
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Heat Conduction ◽  
Conjugate Heat Transfer ◽  
Numerical Study ◽  
Working Fluid ◽  
Static Pressure Distribution ◽  
Flow Parameters ◽  
Permeable Walls ◽  
Solid Bodies

Abstract In this paper, the test supersonic ejector with conjugate heat transfer in solid bodies has been studied numerically. An extensive numerical campaign by means of open-source SU2 solver is performed to analyze the fluid dynamics of the ejector flowfield accounting for the heat conduction in solids. The fluid domain simulation is carried out by employing compressible RANS treatment whilst the heat distribution in solids is predicted by simultaneous solving the steady heat conduction equation. The working fluid is R245fa and all simulations are performed accounting for real gas properties of the refrigerant. Experimental data against numerical results comparison showed close agreement both in terms mass flow rates and static pressure distribution along the walls. Within the CFD trials, the most valuable flow parameters at a wall vicinity are compared: distribution across the boundary layer of the temperature and the turbulent kinetic energy specific dissipation rate, boundary layer displacement and momentum thicknesses. A comprehensive analysis of the simulation results cases with adiabatic walls against cases with heat permeable walls revealed the actual differences of the flow properties in the wall vicinity. However, the ejector performance has not changed noticeably while accounting for the heat conduction in solids.

Streamlining the teaching of unsteady heat conduction in regular solid bodies with heat convection to neighboring fluids

2017 ◽  
Vol 45 (3) ◽  
pp. 245-259
Author(s):  
Antonio Campo ◽  
Jane Y Chang
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Biot Number ◽  
Engineering Students ◽  
Total Heat ◽  
Total Heat Transfer ◽  
Unsteady Heat Conduction ◽  
Cylinders And Spheres ◽  
Solid Bodies ◽  
Long Cylinder

In the analysis of unidirectional, unsteady heat conduction for simple solid bodies (large slab, long cylinder and sphere), the modern tendency adopted by authors of heat transfer textbooks is to calculate the temperatures and total heat transfer with “one-term” series accounting for the proper eigenquantities, which are expressed in terms of the Biot number. The supporting information is available in tables for a large slab, a long cylinder and a sphere. To avoid linear and quadratic interpolation for the Biot numbers listed in the tables, the goal of the present study is to use regression analysis in order to develop compact correlation equations for the first eigenvalues, the first eigencontants and the first constants (for the total heat transfer) varying with the Biot number for large slabs, long cylinders and spheres, all in the ample range 0 <  Bi ≤ 100. This direct approach will speed up the step-by-step calculations of a multitude of unsteady heat conduction problems for engineering students.

MATHEMATICAL MODELING OF THE HEAT TRANSFER PROCESS IN THE SYSTEM OF MULTILAYER CYLINDRICAL SOLID BODIES CONSIDERING INTERNAL SOURCES OF HEAT

2020 ◽  
Vol 1 (1) ◽  
pp. 66-75
Author(s):  
O Pazen ◽  
R Tatsiy
Keyword(s):  
Heat Transfer ◽  
Original Problem ◽  
Direct Method ◽  
Auxiliary Problem ◽  
Heat Transfer Process ◽  
Small Radius ◽  
Shell System ◽  
Multilayer Cylindrical Shell ◽  
Internal Sources ◽  
Solid Bodies

The article is devoted to the application of the direct method to the study of heat transfer processes in the "continuous cylinder inside a multilayer cylindrical shell" system. To solve the initial problem, an auxiliary problem is posed with a “remote” cylinder of sufficiently small radius. The solution is based on the reduction method, the concept of quasiderivatives, the Fourier scheme using the modified eigenfunctions method. The solution to the original problem was obtained by following the radius of the remote cylinder to zero.

scholarly journals Capturing heat transfer for complex-shaped multibody contact problems, a new FDEM approach

2020 ◽  
Vol 7 (5) ◽  
pp. 919-934 ◽  
Author(s):  
Clément Joulin ◽  
Jiansheng Xiang ◽  
John-Paul Latham ◽  
Christopher Pain ◽  
Pablo Salinas
Keyword(s):  
Heat Transfer ◽  
Particle System ◽  
Contact Problems ◽  
Discrete Element ◽  
Fem Model ◽  
New Approach ◽  
Inherent Feature ◽  
Solid Bodies ◽  
Multibody Contact ◽  
Element Method

Abstract This paper presents a new approach for the modelling of heat transfer in 3D discrete particle systems. Using a combined finite–discrete element (FDEM) method, the surface of contact is numerically computed when two discrete meshes of two solids experience a small overlap. Incoming heat flux and heat conduction inside and between solid bodies are linked. In traditional FEM (finite element method) or DEM (discrete element method) approaches, to model heat transfer across contacting bodies, the surface of contact is not directly reconstructed. The approach adopted here uses the number of surface elements from the penetrating boundary meshes to form a polygon of the intersection, resulting in a significant decrease in the mesh dependency of the method. Moreover, this new method is suitable for any sizes or shapes making up the particle system, and heat distribution across particles is an inherent feature of the model. This FDEM approach is validated against two models: a FEM model and a DEM pipe network model. In addition, a multi-particle heat transfer contact problem of complex-shaped particles is presented.

A preliminary investigation of field-induced ion movement in flame gases and its applications

1959 ◽  
Vol 250 (1262) ◽  
pp. 316-336 ◽  
Keyword(s):  
Heat Transfer ◽  
Electric Fields ◽  
Experimental Work ◽  
Carbon Deposition ◽  
Diffusion Flames ◽  
Preliminary Investigation ◽  
Ion Movement ◽  
Potential Applications ◽  
Combustion Processes ◽  
Solid Bodies

The possibility of utilizing ( a ) the movement of flame ions caused by an applied electro­static field and ( b ) the forces acting on flame gases due to such ion movement, as means of managing and improving some combustion processes, is being investigated. A discussion of the underlying principles leads to an outline of potential applications. An account is given of preliminary experimental work on two specific examples, namely, the effect of electric fields on heat transfer from flame gases to solid bodies and on carbon deposition from diffusion flames. Increases in heat transfer in the former and changes in magnitude, location and form of deposition in the latter are described and discussed.

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