Bubble growth in a volatile liquid droplet: interface dynamics
Yu.A. Peschenyuk1,2, A.A. Semenov1,2, G.E. Aivazyan3, M.S. Lebedev4, E.Ya. Gatapova1,2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia, Novosibirsk, Russia
3National Armenian Polytechnic University, Erevan, Armenia
4Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russia
Keywords: cavitation, NACA 0012 series foil, high-speed visualization, Strouhal number
Abstract
The study is focused on the process of bubble growth inside a intensively evaporating liquid droplet placed on a hot structured surface made of black silicon. Experiments are carried out with volatile fluids FС-72, HFE 7100, ethanol and water. The method using the Schliren-system was developed for study of bubble growth inside a droplet. The contact line speed was measured during microdroplet evaporation, including the case of a growing bubble inside the droplet. The speeds of the contact for droplet evaporation with/without bubble were compared. The contact line instability was found, emerging due to a developed structure of substrate; it facilitates the enlargement of local flows in microregions. This facilitates the heat transfer enhancement.
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