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A study on the flow characteristics of butterfly valve with baffles

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Abstract

In the industry, globe valves, which are commonly used to precise control the flow rate along with opening and closing flow in pipes, are technically and economically limited in valve size due to structural instability related to complex internal flow passage. Butterfly valves, on the other hand, have advantages such as low weight and low manufacturing costs, but it is difficult to control the flow rate at an opening angle of 60°or higher and flow is unstable in the case of butterfly valve. Therefore, the purpose of this study is to have characteristics of flow rate of the globe valve that is used in the industry at the same diameter of pipeline and flow stability due to uniformity of flow through the baffle hole by adding 1/2 baffle to butterfly valve. Hole size of baffles were set at 5, 7 and 9 mm and baffles were set at the rear of the butterfly valve. To verify the method of numerical analysis, the results of experimental study were compared with the results of numerical study. As a results, it is confirmed that characteristics of flow rate of butterfly valve with baffle is similar to globe valve in the case of hole size 5 mm. In addition, flow pattern is to be stable by analyzing turbulence energy. Consequently, when applying baffle to butterfly valve, it is possible to reduce the flow unstability and change the flow rate of butterfly valve.

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Abbreviations

ρ:

Density [kg/m3]

\(\underline{\underline v} \) :

Velocity vector [m/s]

T :

Stress tensor [Pa]

S :

Source term [N]

I :

Unit tensor [-]

P :

Peclet number [-]

⌈:

Diffusion coefficient [m2/s]

C v :

Flow coefficient [gallon/min psi0.5]

Q:

Flow rate [gallon/min]

G:

Specific gravity of the fluid [-]

D p :

Diameter of pipe [mm]

y+ :

Dimensionless wall distance [-]

k :

Turbulence kinetic energy [m2/s2]

ε :

Rate of dissipation of turbulence kinetic energy [m2/s3]

ω :

Specific rate of dissipation [1/s]

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Acknowledgments

This paper was supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0002092, The Competency Development Program for Industry Specialist).

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Authors and Affiliations

  1. Graduate School, Dept. of Mechanical Engineering, Dong-A University, Busan, Korea

    Seung-Jun Oh & Jeong-Hwan Yoon

  2. Dept. of Mechanical Engineering, Dong-A University, Busan, Korea

    Si-Pom Kim

Authors
  1. Seung-Jun Oh
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  2. Jeong-Hwan Yoon
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  3. Si-Pom Kim
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Corresponding author

Correspondence to Si-Pom Kim.

Additional information

Recommended by Editor Yang Na

Seung-Jun Oh received his M.S. in Mechanical Engineering from Dong-A university, Busan, Korea in 2018. He is attending Ph.D. in the Mechanical Engineering at Dong-A University. His research interests include valve system, thermodynamics and fluid dynamics.

Jeong-Hwan Yoon received his M.S. in Mechanical Engineering from Dong-A university, Busan, Korea in 2016. He is attending Ph.D. in the Mechanical Engineering at Dong-A University. His research interests include thermodynamics, fluid dynamics and statistics.

Si-Pom Kim received his Ph.D. in engineering at Seoul University. He is currently a Professor of Mechanical Engineering at Dong-A University, Busan, Korea. His research interest is in thermodynamics and fluid flow.

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Oh, SJ., Yoon, JH. & Kim, SP. A study on the flow characteristics of butterfly valve with baffles. J Mech Sci Technol 35, 1065–1073 (2021). https://doi.org/10.1007/s12206-021-0220-1

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  • DOI: https://doi.org/10.1007/s12206-021-0220-1

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