Experimental measurements are reported for the nucleate boiling of benzene, diphenyl, and benzene-diphenyl mixtures. Heat flux is presented as a function of the temperature difference between the heat transfer surface and the coolant saturation temperature. Correlations expressing nucleate boiling are discussed in view of the data. Critical heat fluxes are reported for all the fluids tested and are compared with correlations in the literature. The data were obtained in a pool boiling apparatus at pressures ranging from subatmospheric to 475 psig. System pressure was maintained with nitrogen gas. The test section was a horizontal, 6-inch long, 3/8-inch OD, type 304 stainless steel tube which was heated by direct current;the tube itself was used as a resistance element. For the pure fluids, the nucleate boiling heat transfer data were correlated reason ably well by use of the Rohsenow, Gilmour and Levy equations. The values of the critical heat fluxes for the pure fluids were best correlated by the Bernath relationship. However, none of the literature expressions adequately predicted the large increases in critical heat fluxes obtained when small percentages of benzene were added to diphenyl.
展开▼
