科学の新領域と混相流―次世代技術における混相流―表面張力を利用したコンパクト気液分離器の開発

概要

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In the present study, a novel gas-liquid separator using surface tension force is proposed and its performance is evaluated. The gas bubbles are forced out from the liquid flow at the expanding section by the minimization effect of excess gas-liquid interface free energy, while the liquid phase remains confined inside the micro grooves. Two major gas-liquid separation limits, i.e., (1) flooding limit at high liquid flow rate, and (2) entrainment limit at high gas flow rate are observed and investigated by air-water experiment. Dimensionless correlation for predicting gas-liquid separation limits is proposed. Based on the knowledge from the air-water experiment, a compact gas-liquid separator for R-410A system is developed and the basic characteristics of the separator in refrigerant cycle are investigated. The volume of the present separator is 1/7 compared to that of the conventional separators. Pressure drop reduction in an evaporator is confirmed by bypassing the gas from the evaporator. Finally, a series of 4-16kW capacity gas-liquid separators for practical use is developed.
日本混相流学会の論文