Numerical Modeling of Pressure drop due to Singlephase Flow of Water and Two-phase Flow of Airwater Mixtures through Thick Orifices
Journal Title: INTERNATIONAL JOURNAL OF ENGINEERING TRENDS AND TECHNOLOGY - Year 2012, Vol 3, Issue 4
Abstract
Pressure drops through thick orifices have been numerically investigated with single phase flow of water and twophase flow of air–water mixtures in horizontal pipes. Two-phase computational fluid dynamics (CFD) calculations, using Eulerian–Eulerian model have been employed to calculate the pressure drop through orifices. The operating conditions cover the gas and liquid superficial velocity ranges Vsg = 0.3–4 m/s and Vsl = 0.6–2 m/s, respectively. The local pressure drops have been obtained by means of extrapolation from the computed upstream and downstream linearized pressure profiles to the orifice section. Simulations for the single-phase flow of water have been carried out for local liquid Reynolds number ranging from 3×104 to 2×105 to obtain the discharge coefficient and two-phase local multiplier. The effect of orifice geometry on two-phase pressur losses has been considered by selecting two pipes of 60 mm and 40 mm inner diameter and four different orifice plates (for each pipe) with two area ratios (σ = 0.73 and σ = 0.54) and two different orifice thicknesses (s/d = 0.025, 0.59). The results obtained from numerical simulations are validated against experimental data from the literature and are found to be in good agreement
Authors and Affiliations
Manmatha K. Roul#1 , Sukanta K. Dash*
Keywords
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