Bubble dynamics during boiling on biphilic surfaces with arrays of cavities
V.Yu. Vladimirov, S.Ya. Khmel, E.A. Chinnov
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: boiling, wettability, bubble dynamics, heat transfer intensification
Abstract
A video recording of the boiling process on biphilic copper surface with arrays of hydrophobic cavities of about 100 μm in size and a pitch of 780 μm was conducted. The departure diameters and frequencies for bubbles were determined depending on the heat flux, and their ascent rates were established depending on the diameter. The dependence of the diameters on the heat flux was compared with theoretical dependencies and with data from other authors. It was shown that common dependencies do not take into account the parameters important for boiling on biphilic surfaces with inhomogeneities in the form of depressions/caverns and are poorly suited for describing the bubble dynamics on them.
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