Infrared experiment on the wall temperature distribution for a particle packed channel with constant heat flux |
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Authors: | Jianhua Du Xuejiao Hu Bin Ma Wei Wu Buxuan Wang |
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Institution: | (1) Department of Thermal Engineering, Tsinghua University, 100084 Beijing, China |
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Abstract: | With constant heat flux, wall temperature distribution for a particle filled channel was measured using infrared thermal vision
technology. It was found that nonuniform relative high-temperature regions were randomly distributed on the heating wall,
possibly due to the lower flow velocity, or even due to the blocked flow near the points where particles contact with the
heating wall directly. Not only porosity but also the size and shape of the pores are changed in the wall region of particle-packed
structures, because of the limitation of the wall, and the changes affect largely the fluid flow and heat transfer. The transition
of the flow pattern in pores can be inferred according to the variation of Nu with Re, where the area weighted wall temperature
is adopted to calculate the Nu. |
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Keywords: | porous media heat transfer enhancement infrared thermograph |
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