Supersonic steam ejectors are commonly used in many applications, for example suction of non-condensable gases in steam power plants or heat-powered chillers. In the specific case of ejector chillers, CFD studies of the ejector are necessary for optimization of this device because ejector performances have a direct impact on the COP of the chiller. The complex ejector flow and the high Mach numbers make characterization of the phase change inside this component difficult. Metastability effects also have to be accounted for and some CFD commercial software provide built-in wet-steam models for this purpose. A simpler approach for numerical modeling of multiphase ejector is the Homogeneous Equilibrium Model (HEM) in which the phase change occurs in equilibrium conditions, i.e. metastability is neglected. These second kinds of models are still important tools for preliminary analysis of condensing ejectors. In the present paper a comparison between commercial software wet-steam models and an in-house developed model based on HEM is presented.

CFD Modeling of the Supersonic Condensation Inside a Steam Ejector / Giacomelli, Francesco; Biferi, Giulio; Mazzelli, Federico; Milazzo, Adriano. - In: ENERGY PROCEDIA. - ISSN 1876-6102. - ELETTRONICO. - 101:(2016), pp. 1224-1231. [10.1016/j.egypro.2016.11.137]

CFD Modeling of the Supersonic Condensation Inside a Steam Ejector

GIACOMELLI, FRANCESCO;BIFERI, GIULIO;MAZZELLI, FEDERICO;MILAZZO, ADRIANO
2016

Abstract

Supersonic steam ejectors are commonly used in many applications, for example suction of non-condensable gases in steam power plants or heat-powered chillers. In the specific case of ejector chillers, CFD studies of the ejector are necessary for optimization of this device because ejector performances have a direct impact on the COP of the chiller. The complex ejector flow and the high Mach numbers make characterization of the phase change inside this component difficult. Metastability effects also have to be accounted for and some CFD commercial software provide built-in wet-steam models for this purpose. A simpler approach for numerical modeling of multiphase ejector is the Homogeneous Equilibrium Model (HEM) in which the phase change occurs in equilibrium conditions, i.e. metastability is neglected. These second kinds of models are still important tools for preliminary analysis of condensing ejectors. In the present paper a comparison between commercial software wet-steam models and an in-house developed model based on HEM is presented.
2016
101
1224
1231
Giacomelli, Francesco; Biferi, Giulio; Mazzelli, Federico; Milazzo, Adriano
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1084574
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