Abstract
Surface tension of alcohol/water mixtures has been measured over the whole fraction range and then it has been measured when a surface-active agent was added into the mixtures. The effect of the concentration of alcohol and the surface-active agent on surface tension was experimentally clarified, in order to gain base data related to enhancement of a heat transfer coefficient in the mixtures and water. The experiment has also been carried out to enhance the boiling heat transfer coefficients of water and alcohol/water mixtures on a horizontal heated fine wire at pressure of 0.1 Mpa by adding the surface-active agent into the tested liquid. As a result, the coefficients were enhanced in lower alcohol concentration (C≤O.5) and low heat flux range which is just after onset of boiling. It was also found that the enhancement effect by the surfactant disappears in concentrations over 1000 ppm. Finally, we clarified that the surface tension remarkably affects the heat transfer coefficients in nucleate pool boiling.
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