Abstract
Two-phase flow in ribbed convergent rectangular upward vertical duct was studied.Water and air were usedas materials for two-phase. Numerical studies have been performed to test the influence of increased air and water discharges on the pressure profile and pressure drop through the convergent section, as the effect of increasing the convergent angle on the pressure difference across the convergent section was studied.Water inlet discharges used were between (5-20 L/min), and air discharges were between (5.833-16.666 L/min). Two test channels with convergent angles (10 and 15 degrees) were used.Computational fluid dynamics for a three-dimensional model was simulated with ANSYS fluent 18 depending on the boundary condition and governed by equations of Eulerian multiphase flow model.The results indicated that the pressure along the test channel raises as water and air discharge rise. It was observedtoo the pressure drop increases with the increase of the convergence angle.
Highlights
Two-phase flow is defined as two-phase flow simultaneously in the same pipe like gas and liquid, gas and solid, two dissimilar liquids or liquid and solid. the most complexes of these types is the flow of gas -liquids due to the compressibility and deformation of both phases
It was noted that the Conclusions, which obtained from different researchers were not corresponding under the same test conditions and same fluids, Because Most researchers used classical visual-only method In their studies of flow patterns.Zhu[5] Conducted a numerical study of the effect of hydrofoil on the distribution of bubbles for the bubble flow of different ranges of attack angles and Reynolds number
Roul and Dash [6] employed the EulerianEulerian approach with turbulent model k-epsilon; the results show the numerical values for pressure difference across sudden enlargement was good agreement with experimental values
Summary
Two-phase flow is defined as two-phase flow simultaneously in the same pipe like gas and liquid, gas and solid, two dissimilar liquids or liquid and solid. the most complexes of these types is the flow of gas -liquids due to the compressibility and deformation of both phases. It was observed that the deviation between the numerical values of void fraction and the pressure difference with the experimental values was increased with the increase of the void fraction.Ueda et al [9] used The volume of fluid VOF model, which includes the effect of wall adhesion and surface tension on flow, it was successfully predicted for the bubble flow pattern for low gas discharge and annular flow pattern for high gas discharge.Kumer[10] Performed numerically simulation for water oil two-phase stratified flow in the horizontal and inclined pipes by using volume of fraction (VOF) approach and RNG k-ε. The effect of void fraction, opening angle and Reynolds number was studied on pressure distribution inside a test channel this work, an experimental and numerical study of twophase flow was carried out across a gradual divergent section. The objectives for the present work investigate the effect of water discharge, air discharge and a convergence angle on the pressure profile and drop pressureacross vertical ribbed convergence section.As comparedof experimental and numerical results obtained from the program of ANSYS
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