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research-article

Statistical modeling of stratified two-phase flow

[+] Author and Article Information
M. Benz

Institute for Nuclear and Energy Technologies, Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
matthias.benz@kit.edu

T. Schulenberg

ASME Member Institute for Nuclear and Energy Technologies, Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
thomas.schulenberg@kit.edu

1Corresponding author.

ASME doi:10.1115/1.4035564 History: Received April 15, 2016; Revised December 17, 2016

Abstract

A new numerical model for stratified two-phase flows with wavy interface is derived in this study. Assuming an equilibrium condition between turbulent kinetic energy, potential energy and surface energy, the turbulent length scale in the inner region of a two-layer turbulence approach can be described by a statistical model to account for the influence of the waves. The average wave number, which is an input parameter to this model, is taken from wave spectra. They can be predicted from a Boltzmann statistic of turbulent kinetic energy. The new turbulence model is compared with the two-phase k-∊-turbulence model. Time averaged flow properties calculated by the new approach, such as velocity, turbulence and void profiles, are shown to be in good agreement with experimental data.

Copyright (c) 2016 by ASME
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