The hybrid Lattice Boltzmann method is adopted for a detailed study of surface wettability effects on evolution of vapor bubbles and temperature field of heat exchange surface at boiling. The simulation results show that the bubble departure diameter increases with an increase of static contact angle, and its value normalized by the capillary length approaches 3 for superlyophobic surface. In the range of contact angles of 110 - 129 the size of the dry area bounded by triple contact line greatly increases compared to the bubble departure diameter. At contact angles θ 153 the dry area does not shrink even at the bubble departure stage and the typical film boiling regime is observed. It has been shown that the deterioration of wettability affects the evolution of the temperature field beneath the bubble, which leads to a significant change in the local heat transfer rate.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 3 Dec 2020|
|Event||36th Siberian Thermophysical Seminar, STS 2020 - Novosibirsk, Russian Federation|
Duration: 5 Oct 2020 → 7 Oct 2020