Specific interface area in a system of two immiscible liquids experiencing intense direct contact boiling

Authors

  • Денис Сергеевич Голдобин (Denis S. Goldobin) Institute of Continuous Media Mechanics UB RAS; Perm State University
  • Анастасия Владимировна Долматова (Anastasia Dolmatova) Institute of Continuous Media Mechanics UB RAS
  • Ильяс Маратович Газдалиев (Iljas Gazdaliev) Perm State University

DOI:

https://doi.org/10.17072/1994-3598-2017-3-5-15

Abstract

In this paper we present an approach to theoretical estimation of the mean interface area in the unit volume (δS/δV), which is significant for a system of two well-stirred immiscible liquids experiencing interfacial boiling. The estimation is based on the balance of mechanical energy transformations and the laws of momentum- and heat-transfer within the turbulent boundary layer. Specifically, we assume that the rising bubbles of generated vapour perform stirring of the fluid and serve as a source of the energy of macroscopic mechanical motion. In statistically quasi-steady state, the potential energy of the bubble buoyancy generated per the unit time converts into the kinetic energy of flow, which, in turn, is dissipated due to viscosity per the same time. Description of the viscose dissipation and heat transfer towards the interface is based on the theory of turbulent boundary layer. The theory allows to derive the relations between the specific contact area of two liquids and the other macroscopic characteristics describing the state of the system. In particular, this makes it possible to derive equations for the cooling dynamics of the system in the absence of an external heat influx. On the basis of this approach, one can construct a self-contained mathematical description of the process of interfacial boiling. In this paper, the volume fractions of the two components are assumed to be similar, as well as the values of their kinematic viscosity and molecular thermal diffusivity.

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Published

2017-12-28

How to Cite

Голдобин (Denis S. Goldobin) Д. С., Долматова (Anastasia Dolmatova) А. В., & Газдалиев (Iljas Gazdaliev) И. М. (2017). Specific interface area in a system of two immiscible liquids experiencing intense direct contact boiling. Bulletin of Perm University. Physics, (3(37). https://doi.org/10.17072/1994-3598-2017-3-5-15

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