Study on boiling heat transfer in a shear flow through the lattice Boltzmann method

Abstract

The liquid–vapor phase change and the boiling heat transfer induced by a microheater in a fluid are numerically studied through a two-phase lattice Boltzmann method. The fluid is subjected to simple shear. The effects of the gravity force, flow strength, and wall wettability are taken into account. A direct comparison between the cases of pool boiling and flow boiling is made in terms of the bubble release period, flow features, and the temperature of the microheater. In particular, it is shown that the flow motion has a negligible effect on the bubble release period for hydrophilic surfaces. By contrast, the bubble departure is considerably accelerated by the shear flow for hydrophobic surfaces which is associated with the formation of “bubble neck.”

Recent Advances of Surface Wettability Effect on Flow Boiling Heat Transfer Performance

“…In addition, Sarker et al (2019) indicated the single bubble departure diameter decreased from 1.75 mm to 0.75 mm with the decrease of contact angle decrease from 65.30° to 42.32°. Moreover, Nie et al (2021) studied the effect of surface wettability on bubble separation in flow boiling by the two-phase lattice Boltzmann method. They found the fluid flow has little effect on the release period of the bubble on the hydrophilic surface.…”