Volume 16, Issue 12 (2-2017)                   Modares Mechanical Engineering 2017, 16(12): 50-60 | Back to browse issues page

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Esmaeili K, Shokri V. Comparison of the effect of hydrodynamic and hydrostatic models for Pressure correction term in two-fluid model in modeling gas-liquid two-phase flows. Modares Mechanical Engineering. 2017; 16 (12) :50-60
URL: http://mme.modares.ac.ir/article-15-7729-en.html
1- Department of Mechanical Engineering, Sari Branch, Islamic Azad University, Sari, Iran
2- هیات علمی
Abstract:   (5293 Views)
This paper presents a numerical study using two-fluid model in order to compare the effect of hydrodynamic and hydrostatic models for pressure correction term in two-fluid model in modeling gas-liquid two-phase flows to provide a more accurate model. Two-fluid model is solved by Godunov Approximate Riemann Solver. The two-fluid model is applied using both hydrodynamic pressure correction term and hydrostatic pressure correction term for four sample examples including Water Faucet Case, Water-Air Separation Case, Toumi’s Shock Tube Case, and Large Relative Velocity Shock Tube Case. Hydrostatic pressure correction term is neglected for vertical geometry, therefore, in this geometry; two-fluid model cannot be hyperbolic. Thus, hydrostatic pressure correction term is not a stabilizing term. Also, in horizontal pipe and for atmospheric conditions, hydrostatic pressure correction term presents better results than hydrodynamic pressure correction term. But, in non-atmospheric conditions, hydrodynamic pressure correction term presents better results. Therefore, in order to select a suitable pressure correction term for two-fluid model, we consider geometry (vertical or horizontal) and flow conditions (atmospheric or under-pressure). Also, hydrodynamic pressure correction term in two-fluid equations system is hyperbolic in a boarder range than hydrostatic pressure correction term.
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Article Type: Research Article | Subject: Two & Multi Phase Flow
Received: 2016/08/10 | Accepted: 2016/10/19 | Published: 2016/11/23

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