シャープターンをもつ微細溝付き偏平流路内の気液二相流

概要

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Experimental study has been conducted on air-water two-phase flows in the evaporator flat channels with a sharp 180-degree turn. In order to achieve high ability of liquid film formation and low flow resistance, the triangular cross-sectioned microgrooves with 0.5mm depth and 0.98mm pitch have been engraved over the channel walls. The local void fractions and pressure drops have been measured in two channels with different groove-inclination angles, 45°and 90°to the channel axis, under four channel attitudes. The microgrooves, in particular 45° microgrooves, are very effective to make uniform distributions of the local void fraction and to suppress the liquid films deficit in the channel. The pressure drops of the micro-grooved channels are only 1.2-1.5 times those of the smooth channel, and they can be well correlated by modified Chisholm's equation irrespective of the channel attitudes.
一般社団法人日本機械学会の論文
1998-07-25