scholarly journals Measurement and identification of temperature-dependent thermal conductivity for thermal insulation materials under large temperature difference

2022 ◽  
Vol 171 ◽  
pp. 107261
Author(s):  
Hu Zhang ◽  
Chenyang Shang ◽  
Guihua Tang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Temperature Difference ◽  
Large Temperature ◽  
Temperature Dependent ◽  
Insulation Materials ◽  
Large Temperature Difference ◽  
Temperature Dependent Thermal Conductivity

scholarly journals Analysis of Convective Straight and Radial Fins with Temperature-Dependent Thermal Conductivity Using Variational Iteration Method with Comparison with Respect to Finite Element Analysis

2007 ◽  
Vol 2007 ◽  
pp. 1-15 ◽  
Author(s):  
Safa Bozkurt Coşkun ◽  
Mehmet Tarik Atay
Keyword(s):  
Thermal Conductivity ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Iteration Method ◽  
Variational Iteration Method ◽  
Large Temperature ◽  
Temperature Dependent ◽  
Element Analysis ◽  
Variational Iteration ◽  
Temperature Dependent Thermal Conductivity

In order to enhance heat transfer between primary surface and the environment, radiating extended surfaces are commonly utilized. Especially in the case of large temperature differences, variable thermal conductivity has a strong effect on performance of such a surface. In this paper, variational iteration method is used to analyze convective straight and radial fins with temperature-dependent thermal conductivity. In order to show the efficiency of variational iteration method (VIM), the results obtained from VIM analysis are compared with previously obtained results using Adomian decomposition method (ADM) and the results from finite element analysis. VIM produces analytical expressions for the solution of nonlinear differential equations. However, these expressions obtained from VIM must be tested with respect to the results obtained from a reliable numerical method or analytical solution. This work assures that VIM is a promising method for the analysis of convective straight and radial fin problems.

Thermal Conductivity Of Bi/Sb Superlattice

2000 ◽  
Vol 626 ◽  
Author(s):  
D. W. Song ◽  
G. Chen ◽  
S. Cho ◽  
Y. Kim ◽  
J. B. Ketterson
Keyword(s):  
Thermal Conductivity ◽  
Temperature Difference ◽  
Reference Sample ◽  
Negative Temperature ◽  
Temperature Dependent ◽  
Difference Making ◽  
Cdte Substrate ◽  
Improved Model ◽  
Data Reduction Method ◽  
Temperature Dependent Thermal Conductivity

ABSTRACTThe temperature-dependent cross-plane thermal conductivity of a 1-μm thick 50Å Bi / 50Å Sb superlattice on a (111) CdTe substrate was measured, using a differential 3-ω method. This method uses the temperature difference between the superlattice sample and a reference sample to calculate its cross-plane thermal conductivity. However, the substrate thermal conductivity is comparable to or smaller than the superlattice thermal conductivity near room temperature. This results in a very small or negative temperature difference, making the existing data reduction method inapplicable. Based on an improved model, the temperature-dependent thermal conductivity of the Bi/Sb superlattice is obtained and is about half of the literature value of Bi0.5Sb0.5 bulk alloy.

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