Temperature distribution on the surface of a thin water droplet on a structured surface with slight subcooling
Yu.A. Peshchenyuk1,2, G.E. Ayvazyan3, E.Ya. Gatapova1,2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2M.V. Lomonosov Moscow State University, Moscow, Russia
3National Polytechnic University of Armenia, Yerevan, Armenia
Keywords: microdroplet, microbubbles, evaporation, wetting, temperature field, IR thermography
Abstract
The dynamics of surface temperature changes for a water droplet resting on a structured black silicon substrate heated to 90°C were studied. The wetting properties of black silicon were analyzed during substrate heating in the temperature range of 30-90°C. Thermal imaging studies revealed that vapor nucleation sites form at temperatures close to the boiling point at the liquid-black silicon interface. The dynamics of temperature changes on the surface of a thin liquid droplet during the final stages of evaporation were studied, including the formation and subsequent development of bubble nuclei within the droplet. Convection and bubble formation were shown to result in non-uniform temperature fields.
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