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Characteristics of Cavitation Flow for a Regulating Valve Based on Entropy Production Theory

Author

Listed:
  • Jie He

    (School of Electrical and Control Engineering, Xuzhou University of Technology, Xuzhou 221018, China)

  • Qihang Liu

    (Mechatronic Engineering Institution, China University of Mining and Technology, Xuzhou 221116, China)

  • Zheng Long

    (China Tobacco Shangdong Industrial Co., Ltd., Jinan 250014, China)

  • Yujia Zhang

    (Mechatronic Engineering Institution, China University of Mining and Technology, Xuzhou 221116, China)

  • Xiumei Liu

    (Mechatronic Engineering Institution, China University of Mining and Technology, Xuzhou 221116, China)

  • Shaobing Xiang

    (Mechatronic Engineering Institution, China University of Mining and Technology, Xuzhou 221116, China)

  • Beibei Li

    (Mechatronic Engineering Institution, China University of Mining and Technology, Xuzhou 221116, China)

  • Shuyun Qiao

    (School of Electrical and Control Engineering, Xuzhou University of Technology, Xuzhou 221018, China)

Abstract

A regulating valve is a key control element in the coal liquefaction industry, whose flow field distribution is related to the entropy production. In order to make a quantitative evaluation of the energy loss in the cavitation flow and calculate the magnitude and location of the hydraulic loss in the flow field more accurately, entropy production theory is employed to analyze the flow field in the regulating valve numerically. The entropy production under cavitation condition and its influence on steady-state flow force are also discussed. When the opening of the valve increases, the entropy production and energy loss change dramatically. The entropy production rate (EPR) is mainly distributed at the orifice and downstream of the regulating valve, the entropy production rate (EPR) reaches the maximum value at the orifice, and turbulent pulsation entropy production (TPEP) is the main part of the total entropy production for flow. When the valve’s opening increases from 40% to 70%, the total entropy production (TEP) increases from 467.14 W/K to 630.04 W/K. The entropy production by cavitation (EPC) increases firstly and then decreases. The smallest value of EPC is 0.103 W/K at the 40% opening, while the maximum value is 0.119 W/K at 60% opening. Furthermore, the relationship between total entropy production (TEP) and steady-state flow force can be approximated by an exponential distribution. When the steady-state flow force increases, the total entropy production for flow also increases. Cavitation effect on the steady-state flow force is strengthened firstly and then weakened with increasing the valve’s opening. Finally, a discriminant method based on the change of the steady-state flow force is proposed to detect whether cavitation occurs in the valve or not. The results in this paper could provided a directional and quantitative evaluation of energy loss in the regulating valve, which is help for the structural shape optimization and service life extension combining with external characteristics of the valve and internal flow field.

Suggested Citation

  • Jie He & Qihang Liu & Zheng Long & Yujia Zhang & Xiumei Liu & Shaobing Xiang & Beibei Li & Shuyun Qiao, 2022. "Characteristics of Cavitation Flow for a Regulating Valve Based on Entropy Production Theory," Energies, MDPI, vol. 15(17), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6480-:d:907107
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    References listed on IDEAS

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    1. Sciacovelli, A. & Verda, V. & Sciubba, E., 2015. "Entropy generation analysis as a design tool—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 1167-1181.
    2. Yu, Zhi-Feng & Wang, Wen-Quan & Yan, Yan & Liu, Xing-Shun, 2021. "Energy loss evaluation in a Francis turbine under overall operating conditions using entropy production method," Renewable Energy, Elsevier, vol. 169(C), pages 982-999.
    3. Ghorani, Mohammad Mahdi & Sotoude Haghighi, Mohammad Hadi & Maleki, Ali & Riasi, Alireza, 2020. "A numerical study on mechanisms of energy dissipation in a pump as turbine (PAT) using entropy generation theory," Renewable Energy, Elsevier, vol. 162(C), pages 1036-1053.
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