2成分混合媒体のプール沸騰熱伝達

抄録

Experimental studies have been made for heat transfer during nucleate pool boiling on a horizontal platinum wire in nonazeotropic binary mixtures of R12+R113 and R134a+R113 at pressures from 2 to 8 bar and at heat fluxes below 1.0×10⁵W/m². The substances employed were chosen such that the pure substances have a large difference in saturation temperatures. A correlation was derived by improving J. R. Thome's correlation, predicting the heat transfer coefficients for mixtures with a large difference in saturation temperatures within an accuracy of ±20%. It is also shown that the correlation is applicable for mixtures with small differences in saturation temperatures within the same accuracy. The heat transfer coefficients using the mixtures are smaller than those using the pure substances over the entire concentration range. The heat transfer coefficients for the mixtures depend on the pressures of the system and the heat fluxes at a lesser extent than for the pure substances