Thermal wave determination of layer thicknesses using a pulsed ring heat source

2001 ◽  
Author(s):  
Zhong Ouyang
Keyword(s):  
Heat Source ◽  
Thermal Wave

Photothermal examination of buried layers

1986 ◽  
Vol 64 (9) ◽  
pp. 1291-1292 ◽  
Author(s):  
J. Baumann ◽  
R. Tilgner
Keyword(s):  
Thermal Properties ◽  
Heat Source ◽  
Thermal Wave ◽  
Diffusion Length ◽  
Thermal Waves ◽  
Layer Sample ◽  
Buried Layer ◽  
Buried Layers ◽  
Periodic Illumination

The influence of a buried layer within a sample on the propagation of thermal waves is determined by measuring the phase and amplitude of the photothermal signal during periodic illumination. The results are in agreement with the calculation that follows a thermal-wave approach involving a three-layer sample and a Lambert–Beer-like distribution of the heat source in the covering layer. In this way determination of the thickness or thermal properties of buried layers even much thinner than their thermal-diffusion length is possible.

scholarly journals Determination of a spacewise dependent heat source

2007 ◽  
Vol 209 (1) ◽  
pp. 66-80 ◽  
Author(s):  
Tomas Johansson ◽  
Daniel Lesnic
Keyword(s):  
Heat Source

An analytical approach of heat transfer modelling with thermal stresses in circular plate by means of Gaussian heat source and stress function

2021 ◽  
Author(s):  
Sangita Pimpare ◽  
Chandrashekhar Shalik Sutar ◽  
Kamini Chaudhari
Keyword(s):  
Boundary Condition ◽  
Heat Source ◽  
Circular Plate ◽  
Thermal Stresses ◽  
Research Work ◽  
Homogeneous Boundary Condition ◽  
Flux Boundary Condition ◽  
Differential Transform ◽  
The Mathematical Model

Abstract In the proposed research work we have used the Gaussian circular heat source. This heat source is applied with the heat flux boundary condition along the thickness of a circular plate with a nite radius. The research work also deals with the formulation of unsteady-state heat conduction problems along with homogeneous initial and non-homogeneous boundary condition around the temperature distribution in the circular plate. The mathematical model of thermoelasticity with the determination of thermal stresses and displacement has been studied in the present work. The new analytical method, Reduced Differential Transform has been used to obtain the solution. The numerical results are shown graphically with the help of mathematical software SCILAB and results are carried out for the material copper.

THERMAL TRANSPORT PHENOMENON IN PROCESSED MEAT HEATED BY LASER HEAT SOURCE

2008 ◽  
Vol 08 (01) ◽  
pp. 17-25
Author(s):  
SHUICHI TORII ◽  
WEN-JEI YANG
Keyword(s):  
Heat Source ◽  
Thermal Wave ◽  
Numerical Technique ◽  
Internal Heat ◽  
Internal Heat Source ◽  
Conservation Equation ◽  
Processed Meat ◽  
Laser Heat ◽  
Short Period ◽  
Laser Heat Source

The present study deals with the effect of laser radiation on the propagation phenomenon of a thermal wave in processed meat subjected to symmetrical heating on both sides. Laser heating is modeled as an internal heat source with various time characteristics. The Cattaneo heat flux law, together with the energy conservation equation, is solved by a numerical technique based on an explicit scheme, i.e. MacCormack's predictor-corrector scheme. The study concludes that (1) if the absorption coefficient of the continuously operated laser heat source increases, then temperature overshoot occurs in processed meat within a very short period of time; (2) the overshoot and oscillation of thermal wave depend on the frequency of the heat source time characteristics; and (3) the criterion for the occurrence of thermal wave in a thin processed meat is the thickness of the order of about 1 mm.

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