The Modeling of Bubble Lift-Off Diameter in Vertical Subcooled Boiling Flow

Jingyu Du (), Chenru Zhao, Hanliang Bo and Xin Ren
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Jingyu Du: Huaneng Clean Energy Research Institute, Beijing 102209, China
Chenru Zhao: Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
Hanliang Bo: Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
Xin Ren: Huaneng Clean Energy Research Institute, Beijing 102209, China

Energies, 2022, vol. 15, issue 18, 1-11

Abstract: Bubble lift-off diameter is characterized as the size of a bubble rising from a wall, which is vital in the boundary condition of heat transfer model and interfacial area transport equation. In this paper, mechanistic force analysis was conducted to explore a predictive model for bubble lift-off diameter in a vertical channel of subcooled boiling flow. Specifically, the component of growth force normal to the wall and the shear lift force lead to the lift-off of a bubble on the vertical surface. Through force analysis, we found that bubble lift-off diameter is arranged to be related to wall superheat, latent heat, liquid velocity, fluid properties, bulk liquid subcooling, etc. To account for the contribution of the influencing factors, the dimensionless bubble lift-off diameter was correlated with dimensionless parameters, including the Prandtl number, the Reynolds number, the Jacob number, and dimensionless subcooling. The proposed correlation was assessed according to experimental data and the predictions showed good agreement with the data.

Keywords: bubble lift-off diameter; force analysis; subcooled boiling flow (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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