期刊
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
卷 46, 期 12, 页码 1242-1250出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2007.01.007
关键词
heat transfer; pressure drop; metallic porous block; slot jet; experiments
This study experimentally investigated the convective heat transfer and pressure drop in the metallic porous block with a confined slot air jet. Aluminum foam block with the porosity of 0.93 and the pore density of 10 PPI (pores per inch) was used. The size of the aluminum foam block was fixed. Variable parameters were the ratio of the jet nozzle width to the porous block height (W-j/H), the ratio of the jet-to-foam tip distance to the porous block height (C/H) and the jet Reynolds number (Re). Experimental results reveal that the wall temperature at the stagnation point (x/L = 0) under the slot jet flow was minimal, and monotonously rise along the channel axis until the channel exit. Parametric studies indicate that increasing Re increased the average Nusselt number (Nu), decreasing W-j/H slightly increased Nu, and the effect of C/H on Nu were negligible. The dimensionless pressure drop (CfRe2(L/W-j)(2)) increased as Re increased or W-j/H declined. The effect of C/H on CfRe2 (L/W-j)(2) does not seem regular. Besides, The Nu in the configuration without by-pass flow (i.e. C/H = 0) generally exceeded that with by-pass flow (i.e. C/H = 1-3) at a given dimensionless pumping power (CfRe3(L/W-j)(2)). Within the successfully measured parameter (W-j/H = 0.22-0.35, C/H = 0-3 and Re = 1697-31003), the largest Nu under the same CfRe3(L/W-j)(2) appeared on W-j/H = 0.35 and C/H = 0. (C) 2007 Elsevier Masson SAS. All rights reserved.
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