The effect of the properties of both the solids and liquids on the mechanism of pool boiling in the heterogeneous case



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The results of experiments to find boiling curves in pool boiling are reported. An electrically heated metal wire (304 type stainless steel A. W. G. No. 29 ) was immersed into distilled water, 1-butanol, methylethylketone and some binary mixtures (1.5%, 6%, 62%) 1-butanol in water, and (4.1%, 20%, 52%, 88.5%) M.E.K. in water. From these experiments, boiling curves were obtained. Comparison of data is made with that of Stralen for the same percentage of M.E.K. but with a platinum wire. Because of this difference in experimental data, investigation is made into the literature. From this investigation, it is indicated that boiling heat transfer is by heat conduction with a phase change of the conducting liquid. This is accomplished by the heat energy released or dissipated from the surface of the heating material and absorbed by the conducting liquid with phase change and mass transfer. Thus boiling heat transfer is a problem of heat conduction which is governed by the properties of both the solid materials and of the liquids. The diffusivity of the heating solid governs the energy transfer from the heat source to the adjacent layer of liquid. The latent heat of evaporation of liquids plays an important role in the cooling effect upon the solid heating surface. A large quantity of heat can be withdrawn from the heating surface in a short period by bubble growth due to evaporation. Both the diffusivity of the heating materials and the properties of liquids govern the heat transfer efficiency and play an important role in boiling heat transfer. But the diffusivity of the heating solid governs the heat energy transference from the heat source to the adjacent layer of liquid and participates in boiling heat transfer only in the heterogeneous case.