Effect on bubble dynamics during pool boiling heat transfer in a novel aqueous binary mixture of surfactants

Abstract

Temperature near the heating region changes with the water boiling curve when the heat flux applied. In this study, experiments were carried out by maintaining a cylindrical subcutaneous hypodermic needle as a single active nucleation site. By controlling heat supplied to the site, a single bubble was formed in the saturated water. The boiling phenomenon was recorded. The surfactants used were sodium dodecyl sulfate (SDS) and centrimonium bromide (CTAB). Aqueous binary mixture SDS-CTAB was prepared on a volume percent basis. The effect was measured by studying a single bubble. The vapor bubble resulting from the nucleation site was observed. Bubble parameters, without and with a surfactant, were plotted in two heat fluxes concerning the excess temperature. It is found that, compared with saturated water, the average measurements of bubble detachment diameters and terminal velocities decreased, but the bubble departure frequency increased. On the other side of analysis, with increasing excess needle temperature of site, at 601 kW/m², the detachment diameter decreased, departure frequency increased, rising velocity was increased and at 950 kW/m², the detachment diameter increased, departure frequency increased, rising velocity decreased.