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

Jie He, Qihang Liu, Zheng Long, Yujia Zhang, Xiumei Liu (), Shaobing Xiang, Beibei Li and Shuyun Qiao
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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

Energies, 2022, vol. 15, issue 17, 1-18

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.

Keywords: regulating valve; entropy production; flow force; cavitation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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