Numerical Modeling of Pressure drop due to Single-phase Flow of Water and Two-phase Flow of Air-water Mixtures through Thick Orifices

Manmatha K. Roul; Sukanta K. Dash

doi:https://doi.org/10.14445/22315381/IJETT-V3I4P216

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Volume 3 | Issue 4 | Year 2012 | Article Id. IJETT-V3I4P216 | DOI : https://doi.org/10.14445/22315381/IJETT-V3I4P216

Numerical Modeling of Pressure drop due to Single-phase Flow of Water and Two-phase Flow of Air-water Mixtures through Thick Orifices

Manmatha K. Roul , Sukanta K. Dash

Citation :

Manmatha K. Roul , Sukanta K. Dash, "Numerical Modeling of Pressure drop due to Single-phase Flow of Water and Two-phase Flow of Air-water Mixtures through Thick Orifices," International Journal of Engineering Trends and Technology (IJETT), vol. 3, no. 4, pp. 544-551, 2012. Crossref, https://doi.org/10.14445/22315381/IJETT-V3I4P216

Abstract

Pressure drops through thick orifices have been numerically inve stigated with single phase flow of water and two - phase 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 orific es. The operating conditions cover the gas and liquid superficial velocity ranges V sg = 0.3 – 4 m/s and V sl =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 3×10 4 to 2×10 5 to obtain the discharge coefficient and two - phase local multiplier. The effect of or ifice geometry on two - phase pressure 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 ( ? = 0.73 and ? = 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

Keywords

orifice, pressure drop, two phase flow, area ratio, discharge coefficient, two - phase multiplier.

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