Photothermal deflection measurements for monitoring heat transfer during modulated laser heating of solids

1992 ◽  
Vol 71 (1) ◽  
pp. 53-63 ◽  
Author(s):  
Mark A. Shannon ◽  
Ali A. Rostami ◽  
Richard E. Russo
Keyword(s):  
Heat Transfer ◽  
Laser Heating ◽  
Photothermal Deflection

Heat transfer in water under laser heating through fibres for endovenous laser coagulation

2020 ◽  
Vol 50 (8) ◽  
pp. 793-800 ◽  
Author(s):  
V P Minaev ◽  
N V Minaev ◽  
V Yu Bogachev ◽  
K A Kaperiz ◽  
D A Fedorov ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Laser Heating ◽  
Laser Coagulation

Boubaker Polynomials Expansion Scheme Solution to the Heat Transfer Equation Inside Laser Heated Biological Tissues

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
M. A. Aweda ◽  
M. Agida ◽  
M. Dada ◽  
O. B. Awojoyogbe ◽  
K. Isah ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Analytical Solution ◽  
Numerical Simulations ◽  
Laser Heating ◽  
Transfer Equation ◽  
Biological Tissues ◽  
Heat Transfer Equation ◽  
Boubaker Polynomials ◽  
Laser Heated ◽  
Expansion Scheme

In this study, an analytical solution to the heat transfer equation in biological tissues during laser heating is presented. The results were compared to recently published numerical simulations.

Research Progress on Heat Transfer Theory in Ultra-Fast Laser Heating Technology

2020 ◽  
Vol 57 (1) ◽  
pp. 010005
Author(s):  
吕慧丽 Lü Huili ◽  
毛煜东 Mao Yudong ◽  
于明志 Yu Mingzhi ◽  
杨开敏 Yang Kaimin ◽  
刘芳 Liu Fang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Laser Heating ◽  
Research Progress ◽  
Transfer Theory ◽  
Heat Transfer Theory ◽  
Heating Technology

Optically Based Rapid Heat Transfer Measurements in Complex Internal Flows

2007 ◽  
Vol 129 (12) ◽  
pp. 1655-1665 ◽  
Author(s):  
Charles W. Booten ◽  
John K. Eaton
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Boundary Conditions ◽  
Transfer Coefficient ◽  
Laser Heating ◽  
Heat Conduction Problem ◽  
Reynolds Numbers ◽  
Inverse Heat Conduction Problem ◽  
Inverse Heat Conduction ◽  
Thermal Boundary Conditions

Abstract An optically based technique was developed that involves fabrication of a thin-walled plastic model with laser heating applied to a small section of the outer surface. The heat flux distribution applied to the model by the laser was measured first using a short-duration, transient experiment. The external temperature distribution was then recorded using infrared thermography with steady laser heating. The measured heat flux and temperature distributions were used as thermal boundary conditions in a finite-element code to solve an inverse heat conduction problem for the heat transfer coefficient on the internal passage wall. Hydrodynamically fully developed turbulent flow in a round tube was used as a test case for the development of the new optical method. The Reynolds numbers used were 30,000 and 60,000. This flow was chosen because accurate computational tools were available to calculate the internal heat transfer coefficient for a variety of thermal boundary conditions. In addition, this geometry simplified both the model fabrication and the implementation of a finite-element model for the inverse heat conduction problem. Heat transfer coefficient measurements agreed with numerical simulations and semi-analytical solutions within 1.5% and 8.5% for the low and high Reynolds numbers, respectively. Additional simulations suggest that the method can be accurate with thermal boundary conditions more complex than in these experiments.

Heat Transfer Across Metal-Dielectric Interfaces During Ultrafast-Laser Heating

2011 ◽  
Author(s):  
Liang Guo ◽  
Stephen L. Hodson ◽  
Timothy S. Fisher ◽  
Xianfan Xu
Keyword(s):  
Heat Transfer ◽  
Laser Heating ◽  
Ultrafast Laser ◽  
Direct Coupling ◽  
Phonon Coupling ◽  
Coupled Transport ◽  
Dielectric Interface ◽  
Electron Phonon Coupling ◽  
Measurement Results ◽  
Dielectric Interfaces

Heat transfer across a metal-dielectric interface involves coupled transport of electrons and phonons in metal and phonons in dielectric, which can be accomplished by coupling between phonons in metal and dielectric or direct coupling between electrons in metal and phonons in dielectric. Direct electron-phonon coupling across the metal-dielectric interface is neglected in some studies [1, 2] but considered in some others [3–5]. We investigate heat transfer across metal-dielectric interfaces during ultrafast-laser heating by employing transient thermo-reflectance (TTR) measurements on Au-Si samples. With ultrafast-laser heating that creates strong thermal non-equilibrium between electrons and phonons in metal, it is possible to isolate the effect of direct electron-phonon coupling across the interface. Simulation results based on the two-temperature model (TTM) are compared with the measurement results. The comparison shows a strong direct coupling between electrons in metal and phonons in dielectric.

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