A study of the heat transfer characteristics of a laser rod in a concentric circular tube |
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Authors: | Z Li X Huai Y Tao |
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Institution: | (1) Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100080, P.R. China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100080, P.R. China |
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Abstract: | An analytical solution was derived from a two-dimensional heat conduction model with non-uniform boundary conditions for a
side-pumped, side-cooled cylindrical laser rod. The convective heat transfer coefficient and the spatially varying fluid temperature
were determined from the theoretical solutions or experimental correlations of convective heat transfer in an annular passage
with prescribed heat fluxes. The first term of the analytical solution coincides with the result of the one-dimensional model.
The other terms indicate that the axial temperature-rise in a laser rod has positive correlations with the axial coolant temperature-rise,
the radial Biot number and the length-to-radius ratio of the laser rod. Subsequently, a conjugate numerical simulation that
couples up the fluid convection and the solid conduction was performed. Compared with the analytical solution, the conjugate
numerical simulation better exhibits the entrance effects of flow and heat transfer; therefore, it may provide more accurate
solution in specific cases.
PACS 44.10.+i; 44.90.+c |
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Keywords: | |
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