A CORRELATION FOR FORCED CONVECTIVE BOILING HEAT-TRANSFER OF NONAZEOTROPIC REFRIGERANT MIXTURE OF HCFC22 CFC114 IN A HORIZONTAL SMOOTH TUBE/

Experiments are carried out on the boiling heat transfer of nonazeotro pic refrigerant mixtures of HCFC22/CFC114 flowing inside a 7.9 mm ID h orizontal smooth tube. Using a water-heated, double-tube type evaporat or. the local heat transfer coefficients are measured for both counter and parallel flows. An empirical correlation equation is proposed for the data in the annular-flow regime, taking into account the mixture effect in the authors' previous correlation equation for pure refriger ants. The mean deviation between the calculated and measured heat tran sfer coefficients is 8.9% for the present experimental data and 7.1% f or the data obtained by Jung. The equation reveals that the convection heat transfer is dominant due to the suppression of nucleate boiling for the mixtures.