TY - GEN
T1 - Heat transfer to non-azeotropic mixtures of refrigerants flowing in a horizontal evaporator tube
AU - Yoshida, Suguru
AU - Mori, Hideo
AU - Matsunaga, Takashi
AU - Ohishi, Katsumi
PY - 1991/12/1
Y1 - 1991/12/1
N2 - The characteristics of the heat transfer to nonazeotropic refrigerant mixtures of HCFC22 and CFC114 flowing in a horizontal evaporator tube were experimentally investigated. The heat transfer to the mixture was significantly degraded due to a mass transfer resistance in the region where nucleate boiling contributes substantially to the heat transfer, but such degradation was little in the forced convection dominated region. This little effect of the mass transfer resistance in the forced convection dominated region was theoretically confirmed based on a convective evaporation model for an annular two-phase flow of the mixture. A circumferential variation of the heat transfer coefficient, which was observed in the annular two-phase flow of the mixture, was theoretically explained to be attributed to the circumferential composition variation caused by the nonuniform liquid film thickness.
AB - The characteristics of the heat transfer to nonazeotropic refrigerant mixtures of HCFC22 and CFC114 flowing in a horizontal evaporator tube were experimentally investigated. The heat transfer to the mixture was significantly degraded due to a mass transfer resistance in the region where nucleate boiling contributes substantially to the heat transfer, but such degradation was little in the forced convection dominated region. This little effect of the mass transfer resistance in the forced convection dominated region was theoretically confirmed based on a convective evaporation model for an annular two-phase flow of the mixture. A circumferential variation of the heat transfer coefficient, which was observed in the annular two-phase flow of the mixture, was theoretically explained to be attributed to the circumferential composition variation caused by the nonuniform liquid film thickness.
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M3 - Conference contribution
AN - SCOPUS:0026406714
SN - 0791806138
T3 - Proc 3 ASME JSME Therm Eng Jt Conf
SP - 295
EP - 300
BT - Proc 3 ASME JSME Therm Eng Jt Conf
PB - Publ by ASME
T2 - Proceedings of the 3rd ASME/JSME Thermal Engineering Joint Conference Part 2 (of 5)
Y2 - 17 March 1991 through 22 March 1991
ER -