Results of calculation of the efficiency of circular porous channels in the transient region 2300≤ Resm ≤ 10,000 of movement of an incompressible coolant (water) in smooth-wall channels compared with the porouschannels at the first-kind boundary conditions are presented. The efficiencies of circular porous channels and smooth-wall ones were compared using the modified Guhman method, in accordance with which the efficiency of a short porous channel, in which a coolant is rapidly heated, is determined by comparison of this channel with a long smooth-wall channel. As a criterion for selection of the length of a circular porous channel, the attainment of the value 0.8 by the average dimensionless temperature of the liquid at the output of this channel was used. The influence of different design and regime parameters of the channels being compared on their efficiencies was investigated and the parameters, at which the gain in heat transfer superpasses the loss in hydraulics, were determined.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 85, No. 6, pp. 1167–1177, November–December 2, 2011.
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Lukisha, A.P. Calculation of the efficiency of circular porous channels by the modified Guhman method. J Eng Phys Thermophy 85, 1266–1277 (2012). https://doi.org/10.1007/s10891-012-0770-2
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DOI: https://doi.org/10.1007/s10891-012-0770-2