Experimental investigation of wall temperature evolution in a compact heat exchanger at a drastic change in the heat flux |
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Authors: | B V Perepelitsa |
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Institution: | (1) Mechanical Engineering Department, National Institute of Technology Karnataka, Surathkal, 575025, Karnataka, India |
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Abstract: | Results of experimental study of the nonstationary temperature field on the surface of a complex shape channel at a jump-like
change in heat release with time in the wall of packing with one-way heat supply are presented. Measurements were carried
out in the air flow between two plates with triangular corrugations directed at 90° relative each other. Measurements were
carried out by thermocouples with the thickness of less than 10 microns. The effect of Reynolds number and supplied power
on the temperature change over the heat exchanger surface with time caused by a jump-like change in supplied electric power
at a turbulent air flow is analyzed. Investigations have revealed typical features of temperature evolution over the perimeter
of the heated cell. Experimental data on time dependence of temperature can be approximated well by the exponential function. |
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