細管内における冷媒HCFC123の強制対流沸騰

概要

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[Abstract] This paper is an experimental investigation on forced convective boiling of refrigerant HCFC 123 in a mini-tube. The inner diameters of test tubes are φ0.51 and φ0.30 mm. Ranges of the experimental parameters are as follows: the pressure P= 0.1-0.3 MPa, the mass flux G= 150-750 kg/m^2s, the heat flux q= 10-30 kW/m^2, the vapor quality x= 0.06-1.0. Heat transfer coefficients were measured in condition of constant heat fluxes, and compared with the data for a macro-scale tube. The heat transfer characteristics in mini-tubes were different from the conventional ones. The heat transfer coefficients in low quality region were higher than those for pool boiling, but decreased with vapor quality. The enhancement of heat transfer coefficients by forced convective evaporation couldn't be found. The heat transfer coefficients increased with heat flux, but were almost independent of mass flux.
近畿大学工業高等専門学校の論文