Performance Prediction of Compressible Two-Phase Flow through Ejectors | ||||
| ERJ. Engineering Research Journal | ||||
| Article 4, Volume 38, Issue 1, January 2015, Page 31-46 PDF (7.08 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2015.66773 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| N.I.I Hewedy; M.H Hamed; A.F.M Mahrous; T.A Ghonim | ||||
| Mechanical Power Engineering Department, Faculty of Engineering, Menoufiya University, Shebin El-Kom, Egypt. | ||||
| Abstract | ||||
| The objective of present work is to investigate theoretically the performance of two-phase flow (gas-liquid) through ejectors. The numerical investigation is based on non-homogeneous, (liquid and vapor velocities are not equal), non-equilibrium (liquid and vapor temperatures are not equal), two-fluid model, (Eulerian-Eulerian), conservation equations governing steady, two–dimensional (axisymmetric), turbulent, compressible, and parabolic two-phase flow. These equations are namely continuity, momentum, and energy. These equations are solved iteratively using control volume method with Prandtl’s mixing length as a turbulence model. Mass and heat transfer between the liquid and vapor phases are considered. Wall function is used instead of using very fine grid near the wall. The coordinates system is converted to bodyfitted coordinates. Refrigerant 134a is used as a working fluid. The Modified Benedict-Webb-Rubin (MBWR) equation of state is used to represent compressibility. The presented model is validated against previously published data in literature. The validation showed reasonable agreement. Effects of changes in geometry and operating conditions on ejector performance are investigated. Moreover, effects of certain parameters on ejector efficiency are presented showing that, for maximum efficiency both geometrical and operational parameters must be carefully selected. Overall, the results lead to useful information for ejector optimum design and prediction of the ejector behavior and performance. | ||||
| Keywords | ||||
| Non-homogeneous; non-equilibrium; two-phase flow; mass and heat transfer; compressible flow; Two-fluid model; maximum efficiency | ||||
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