H214 HEAT TRANSFER ENHANCEMENT BY THE PERFORATED PLATE INSTALLED BETWEEN AN IMPINGING JET AND THE TARGET PLATE(Electronics cooling-3)

概要

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The purpose of this study is to investigate the heat transfer augmentation by the perforated plate placed between an impinging air jet and the target plate. The liquid crystal technique using Neural networks with median filtering is used to determine the Nusselt number distributions on the target surface. The experiments were made for the jet Reynolds number (Re) 23,000. The effects of the pitch-to-diameter (p/d_l) from 1.5 to 2.5 in the perforated plate, the hole diameter on perforated plate (d_l) from 4 mm to 12 mm, the perforated plate to target surface distance (z/d_l) from 1 to 3, the nozzle-to-target surface distance (L/d) from 2 to 10, and the shape of perforation hole on the heat transfer characteristics were experimentally investigated. It was found that the average heat transfer rates at the stagnation point region corresponding to r/d ≤ 1.0 are maximum 2.3 times greater than those without the perforated plate.
一般社団法人日本機械学会の論文
2000-10-01