Numerical simulation of Marangoni flow on droplet impingement on a superheated pool

doi:10.7523/j.ucas.2023.063

Abstract

Abstract: We numerically investigate the dynamic behaviors of a droplet impacting onto the non-volatile superheated liquid pool, and focuse on the influence of the Marangoni effect resulted from the inhomogeneous temperature distribution at the surface of liquid pool. Particularly, the time evolution of the flow field and the temperature field inside the pool during and after the impacting are studied. We find that the pool surface, made of oil, is cooled quickly as the ethanol droplet approaches, and a large temperature gradient is produced along the radial direction. Correspondingly, the Marangoni force directs radially inwards to resist the radial outward vapor stress, and a “jet” like structure is formed at the position where the vapor layer becomes thinnest. As the time advances, the Marangoni force becomes dominant and the “jet” is pushed radially inwards until the rear of the droplet and form the downward plume flow. In addition, as the viscosity of the liquid pool increases, the flow induced by the vapor stress is suppressed which further reduce the heat exchange efficiency near the interface.

Key words: Leidenfrost, Marangoni effect, droplet impacting liquid pool, liquid-gas phase change

CLC Number:

O359.1

ZHAO Shuo, ZHANG Jie, NI Mingjiu. Numerical simulation of Marangoni flow on droplet impingement on a superheated pool[J]. Journal of University of Chinese Academy of Sciences, 2024, 41(3): 289-297.

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