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

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  • Ariafar, Kavous
  • Buttsworth, David
  • Al-Doori, Ghassan
  • Sharifi, Navid

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.

Suggested Citation

  • Ariafar, Kavous & Buttsworth, David & Al-Doori, Ghassan & Sharifi, Navid, 2016. "Mixing layer effects on the entrainment ratio in steam ejectors through ideal gas computational simulations," Energy, Elsevier, vol. 95(C), pages 380-392.
    • Handle: RePEc:eee:energy:v:95:y:2016:i:c:p:380-392
    DOI: 10.1016/j.energy.2015.12.027
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    References listed on IDEAS

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    1. Ji, MyoungKuk & Utomo, Tony & Woo, JuSik & Lee, YongHun & Jeong, HyoMin & Chung, HanShik, 2010. "CFD investigation on the flow structure inside thermo vapor compressor," Energy, Elsevier, vol. 35(6), pages 2694-2702.
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    Cited by:

    1. Karthick, S.K. & Rao, Srisha M.V. & Jagadeesh, G. & Reddy, K.P.J., 2018. "Experimental parametric studies on the performance and mixing characteristics of a low area ratio rectangular supersonic gaseous ejector by varying the secondary flow rate," Energy, Elsevier, vol. 161(C), pages 832-845.
    2. Yang, Yan & Zhu, Xiaowei & Yan, Yuying & Ding, Hongbing & Wen, Chuang, 2019. "Performance of supersonic steam ejectors considering the nonequilibrium condensation phenomenon for efficient energy utilisation," Applied Energy, Elsevier, vol. 242(C), pages 157-167.
    3. Tang, Yongzhi & Liu, Zhongliang & Li, Yanxia & Huang, Zhifeng & Chua, Kian Jon, 2021. "Study on fundamental link between mixing efficiency and entrainment performance of a steam ejector," Energy, Elsevier, vol. 215(PB).
    4. Shan, Yong & Zhang, Jing-zhou & Ren, Xiao-wen, 2018. "Numerical modeling on pumping performance of piccolo-tube multi-nozzles supersonic ejector in an oil radiator passage," Energy, Elsevier, vol. 158(C), pages 216-227.
    5. Yang, Yan & Karvounis, Nikolas & Walther, Jens Honore & Ding, Hongbing & Wen, Chuang, 2021. "Effect of area ratio of the primary nozzle on steam ejector performance considering nonequilibrium condensations," Energy, Elsevier, vol. 237(C).
    6. Tashtoush, Bourhan M. & Al-Nimr, Moh'd A. & Khasawneh, Mohammad A., 2019. "A comprehensive review of ejector design, performance, and applications," Applied Energy, Elsevier, vol. 240(C), pages 138-172.
    7. Bodys, Jakub & Smolka, Jacek & Palacz, Michal & Haida, Michal & Banasiak, Krzysztof & Nowak, Andrzej J. & Hafner, Armin, 2016. "Performance of fixed geometry ejectors with a swirl motion installed in a multi-ejector module of a CO2 refrigeration system," Energy, Elsevier, vol. 117(P2), pages 620-631.
    8. Wang, Chen & Wang, Lei & Wang, Xinli & Zhao, Hongxia, 2017. "Design and numerical investigation of an adaptive nozzle exit position ejector in multi-effect distillation desalination system," Energy, Elsevier, vol. 140(P1), pages 673-681.

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