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Research Papers: Fundamental Issues and Canonical Flows

A Parametric Study of Hydrodynamic Cavitation Inside Globe Valves

[+] Author and Article Information
Zhi-jiang Jin

Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
e-mail: jzj@zju.edu.cn

Zhi-xin Gao

Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
e-mail: zhixingao@foxmail.com

Jin-yuan Qian

Institute of Process Equipment;
State Key Laboratory of Fluid Power and
Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China;
Department of Energy Sciences,
Lund University,
P.O. Box 118,
Lund SE-22100, Sweden
e-mails: qianjy@zju.edu.cn;
jin-yuan.qian@energy.lth.se

Zan Wu

Department of Energy Sciences,
Lund University,
P.O. Box 118,
Lund SE-22100, Sweden
e-mail: zan.wu@energy.lth.se

Bengt Sunden

Department of Energy Sciences,
Lund University,
P.O. Box 118,
Lund SE-22100, Sweden
e-mail: bengt.sunden@energy.lth.se

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received May 16, 2017; final manuscript received September 15, 2017; published online October 31, 2017. Assoc. Editor: Shizhi Qian.

J. Fluids Eng 140(3), 031208 (Oct 31, 2017) (9 pages) Paper No: FE-17-1278; doi: 10.1115/1.4038090 History: Received May 16, 2017; Revised September 15, 2017

Hydrodynamic cavitation that occurs inside valves not only increases the energy consumption burden of the whole piping system but also leads to severe damages to the valve body and the piping system with a large economic loss. In this paper, in order to reduce the hydrodynamic cavitation inside globe valves, effects of valve body geometrical parameters including bending radius, deviation distance, and arc curvature linked to in/export parts on hydrodynamic cavitation are investigated by using a cavitation model. To begin with, the numerical model is compared with similar works to check its accuracy. Then, the cavitation index and the total vapor volume are predicted. The results show that vapor primarily appears around the valve seat and connecting downstream pipes. The hydrodynamic cavitation does not occur under a small inlet velocity, a large bending radius, and a large deviation distance. Cavitation intensity decreases with the increase of the bending radius, the deviation distance, and the arc curvature linked to in/export parts. This indicates that valve geometrical parameters should be chosen as large as possible, while the maximal fluid velocity should be limited. This work is of significance for hydrodynamic cavitation or globe valve design.

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Figures

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Fig. 1

Schematic structure of the studied globe valve

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Fig. 2

Computational cells of the studied globe valves

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Fig. 3

Pressure along the middle surface of valve throat of half opened valves: (a) inlet velocity is 5 m/s and (b) inlet velocity is 10 m/s

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Fig. 4

Structural parameters at different values of the globe valve

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Fig. 5

Flow and pressure fields under different bending radiuses (a), (b) R = 60 mm, (c), (d) R = 80 mm, and (e), (f) R = 120 mm

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Fig. 6

Flow and pressure fields under different deviation distances (a), (b) H = 60 mm and (c), (d) H = 50 mm

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Fig. 7

Cavitation in half opened state valves when H = 40 mm (a) R = 60 mm, (b) R = 80 mm, and (c) R = 120 mm

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Fig. 8

Cavitation in half opened state valves when R = 80 mm (a) H = 50 mm and (b) H = 60 mm

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Fig. 9

Cavitation index of half opened valves (a) inlet velocity is 5 m/s, (b) inlet velocity is 7.5 m/s, and (c) inlet velocity is 10m/s

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Fig. 10

Cavitation index of fully opened valves at an inlet velocity of 10 m/s

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Fig. 11

Total vapor volume in half opened valves when inlet velocity is 5 m/s

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Fig. 12

Flow and pressure fields under different arc curvatures at R = 80 mm (a), (b) r = 40 mm, (c), (d) r = 80 mm, and (e), (f) r = 100 mm

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Fig. 13

Flow and pressure fields under different arc curvatures at R = 100 mm (a), (b) r = 40 mm, (c), (d) r = 80 mm, and (e), (f) r = 100 mm

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Fig. 14

Cavitation in half opened state valves when R = 80 mm (a) r = 40 mm, (b) r = 80 mm, and (c) r = 100 mm

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Fig. 15

Cavitation in half opened state valves when R = 100 mm (a) r = 40 mm, (b) r = 80 mm, and (c) r = 100 mm

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Fig. 16

Cavitation index of half opened valves under different arc curvatures

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