セル内固気二相衝突噴流の伝熱特性 : 第2報, 伝熱促進効果とその伝熱促進機構

概要

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This paper deals with the heat transfer characteristics of the impinging air jet laden with solid particles recirculating in an enclosure, which was proposed in our previous paper. The particles enclosed in the test cell were glass, aluminum and ceramic with the diameter ranging from 50μm to 600μm, and a 50μm thick stainless steel foil glued on the bottom of the test cell was used as a heat transfer surface. Results clearly show that the heat transfer coefficient in the cell containing solid particles is about 30% higher than that of the same cell without particles; the heat transfer coefficient of the gas-solid suspension within the cell is about 120% higher than the single phase flow of a conventional impinging air jet without the cell. Under our experimental conditions, it can be considered that the heat tranfer enhancement observed in the present study is mainly caused by the increase in turbulence of gas flow due to particle motion, since the heat transfer coefficient is hardly affected by the volume fraction of solid particles in the stagnation region, which is influenced by the number of particles enclosed in the test cell.
一般社団法人日本機械学会の論文
1996-04-25