Abstract
Critical heat flux (CHF) of binary mixtures in nucleate pool boiling was newly measured with a horizontal platinum wire, 0.5 mm in diameter, over the full range of concentrations of mixtures including their pure components. Test mixtures were methanol/water, ethanol/water, methanol/ethanol, ethanol/n-butanol, and methanol/benzene, each in the saturated state at atmospheric pressure. The 250 raw CHF data were obtained at the 56 concentrations of the five mixtures. Compared with CHF which would be expected from a single component with the same properties of the mixtures, aqueous mixtures reveal significant increases of CHF, while the other three organic mixtures show the same level of CHF. In correlating the data, a dimensionless Marangoni number was newly introduced to successfully acheive to an empirical correlation of CHF.
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