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Fluids 2018, 3(2), 38; https://doi.org/10.3390/fluids3020038

Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
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Received: 4 May 2018 / Revised: 25 May 2018 / Accepted: 29 May 2018 / Published: 1 June 2018
(This article belongs to the Special Issue Flow and Heat or Mass Transfer in the Chemical Process Industry)
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Abstract

The complexity of flashing flows is increased vastly by the interphase heat transfer as well as its coupling with mass and momentum transfers. A reliable heat transfer coefficient is the key in the modelling of such kinds of flows with the two-fluid model. An extensive literature survey on computational modelling of flashing flows has been given in previous work. The present work is aimed at giving a brief review on available theories and correlations for the estimation of interphase heat transfer coefficient, and evaluating them quantitatively based on computational fluid dynamics simulations of bubble growth in superheated liquid. The comparison of predictions for bubble growth rate obtained by using different correlations with the experimental as well as direct numerical simulation data reveals that the performance of the correlations is dependent on the Jakob number and Reynolds number. No generally applicable correlations are available. Both conduction and convection are important in cases of bubble rising and translating in stagnant liquid at high Jakob numbers. The correlations combining the analytical solution for heat diffusion and the theoretical relation for potential flow give the best agreement. View Full-Text
Keywords: flashing flow; interphase heat transfer coefficient; bubble growth in superheated liquid; two-fluid model; computational fluid dynamics flashing flow; interphase heat transfer coefficient; bubble growth in superheated liquid; two-fluid model; computational fluid dynamics
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Liao, Y.; Lucas, D. Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD. Fluids 2018, 3, 38.

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