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research-article

COMPUTATIONAL FLUID DYNAMICS MODELING OF FLASHING FLOW IN CONVERGENT-DIVERGENT NOZZLE

[+] Author and Article Information
Quang Dang Le

Department of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milan, Italy
lequang.dang@polimi.it

Riccardo Mereu

Department of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milan, Italy
riccardo.mereu@polimi.it

Giorgio Besagni

Department of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milan, Italy
giorgio.besagni@polimi.it

Vincenzo Dossena

Department of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milan, Italy
vincenzo.dossena@polimi.it

Fabio Inzoli

Department of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milan, Italy
fabio.inzoli@polimi.it

1Corresponding author.

ASME doi:10.1115/1.4039908 History: Received March 20, 2017; Revised April 02, 2018

Abstract

In this paper, a computational fluid dynamics model of flashing flow, which considers the thermal non-equilibrium effect, has been proposed. In the proposed model, based on the two-phase mixture approach, the phase-change process depends on the difference between the vaporization pressure and the vapour partial pressure. The thermal non-equilibrium effect has been included by using ad-hoc modelling of the boiling delay. The proposed model has been applied to the case of two-dimensional axisymmetric convergent-divergent nozzle, which is representative of well-known applications in nuclear and energy engineering applications (e.g., the primary flow in the motive nozzle of ejectors). The numerical results have been validated based on a benchmark case from the literature and have been compared with the numerical results previously obtained by different research groups. The proposed approach has shown a good level of agreement as regards the global and the local experimental fluid dynamic quantities. In addition, sensitivity analyses have been carried out concerning (a) grid independency, (b) turbulence modelling approaches, (c) near-wall treatment approaches, (d) turbulence inlet parameters and (e) semi-empirical coefficients. In conclusion, the present paper aims to provide guidelines for the simulation of flash boiling flow in industrial applications.

Copyright (c) 2018 by ASME
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