10402 ミニおよびマイクロチャンネルにおけるサブクール流動沸騰(環境問題と伝熱工学(1),OS.10 環境問題と伝熱工学)

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Subcooled flow boiling of water and aqueous solution of ethanol has been investigated in horizontal mini and micro channels. Tested fluids are water and aqueous solution of 10 and 50 wt% of ethanol. Mini-sized channel is 140mm in length, 1mm in height and 1mm in width, and micro-channel is 290mm in length, 0.5mm in height and 0.7mm in width. Copper heating surface of 1mm × 10mm is placed at the bottom of mini-sized channel and that of 0.5mm × 10mm is used for the micro-channel. The tested liquid subcooling is 40K at atmospheric condition and the liquid velocity is 0.15〜1.0 m/s in mini-channel .and 0.3〜0.5m/s in mini-channel. Microbubble emission boiling occurs in transition boiling and the heat fluxes increase higher than the ordinary critical heat fluxes for the channels.
2009-03-05