Mixing layer effects on the entrainment ratio in steam ejectors through ideal gas computational simulations

Ariafar, Kavous and Buttsworth, David and Al-Doori, Ghassan and Sharifi, Navid (2016) Mixing layer effects on the entrainment ratio in steam ejectors through ideal gas computational simulations. Energy, 95. pp. 380-392. ISSN 0360-5442

Abstract

Ejector entrainment ratios are influenced by both pressure-driven effects and the mixing between the primary and secondary streams, but the significance of each factor has not been identified in prior literature. This paper presents a computational simulation investigation of flow in a representative steam ejector to specify the contribution of mixing and pressure-driven effects to the overall ejector entrainment ratio under different operating conditions. The simulation of mixing layer growth was validated by using experimental data available in the literature, while the application of the computational method to the ejector flows was validated using static pressure distribution and entrainment ratio data in the
particular experimental ejector arrangement. Simulation results show that under a fixed operating condition for the primary and discharge streams, at lower secondary pressure the ejector entrainment ratio is more strongly influenced by the mixing effects. For the particular ejector and the operating conditions considered herein, about 35% of the ejector entrainment ratio is due to mixing effects when
the secondary stream pressure lift ratio is 4.5, while this portion is reduced to about 22% when the secondary stream pressure lift ratio is 1.6.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 05 Jul 2016 01:42
Last Modified: 05 Jul 2016 01:42
Uncontrolled Keywords: steam ejector; mixing layer growth rate; compressibility effects; entrainment ratio; CFD (computational fluid dynamics)
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091305 Energy Generation, Conversion and Storage Engineering
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
B Economic Development > 85 Energy > 8505 Renewable Energy > 850506 Solar-Thermal Energy
Identification Number or DOI: 10.1016/j.energy.2015.12.027
URI: http://eprints.usq.edu.au/id/eprint/28903

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