Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   MARCH 2017 , Volume 16 , Number 12 #F0074; Page(s) 50 To 60.
 
Paper: 

COMPARISON OF THE EFFECT OF HYDRODYNAMIC AND HYDROSTATIC MODELS FOR PRESSURE CORRECTION TERM IN TWO-FLUID MODEL IN MODELING GAS-LIQUID TWO-PHASE FLOWS

 
 
Author(s):  ESMAEILI KAZEM, SHOKRI VAHID*
 
* DEPARTMENT OF MECHANICAL ENGINEERING, ISLAMIC AZAD UNIVERSITY SARI BRANCH, SARI, IRAN
 
Abstract: 

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 gasliquid 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 twofluid equations system is hyperbolic in a broader range than hydrostatic pressure correction term.

 
Keyword(s): TWO PHASE FLOW, TWO-FLUID MODEL, PRESSURE CORRECTION TERM, NUMERICAL SIMULATION
 
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