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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v35.i5.10
pages 395-416

Effect of Labyrinth Cavities on Cavitation Reduction in a Conical Valve

S. P. Asok
Department of Mechanical Engineering, Mepco Schlenk Engineering College (MSEC), Sivakasi, India
K. Sankaranarayanasamy
Department of Mechanical Engineering, National Institute of Technology, Tiruchirapalli, India
Thirumalachari Sundararajan
Thermodynamics and Combustion Engineering Laboratory Department of Mechanical Engineering Indian Institute of Technology Madras, Chennai – 600036, India
R. Manivannan
Department of Mechanical Engineering, Mepco Schlenk Engineering College (MSEC), Sivakasi, India

ABSTRAKT

High-intensity cavitation occurring in water flow past a valve causes vibration, noise, fatigue, and erosion of the valve and the associated piping. This paper aims to reduce cavitation through a design modification on the tapering body of a conical valve. The flow and cavitation characteristics of two different 1 in sized hydraulic conical valves have been investigated. The first one is a conventional conical valve (CCV). The newly designed second valve has labyrinth cavities on the conical valve body and hence is named the labyrinth conical valve (LCV). Computational fluid dynamics (CFD) simulations identified LCV to cavitate less than CCV. To validate the CFD predictions, different experiments were conducted. The predicted mass flow rates were found to be in close agreement with the experimental results. The bubble flow patterns of the valves were indistinguishable in visual observation. Hence, a detailed digital image processing (DIP) analysis was invoked. It showed that the cavitating flow through a LCV possessed both less bubble pixel count and bubble image entropy attributable to low cavitation. Further endorsement was obtained through a bacterial testing method using the interesting fact that cavitation can disinfect water. This test indicated that the number of E. coli bacterial colonies in the water handled by a LCV is larger compared to that of a CCV, thus confirming that the LCV is a low-cavitation valve.


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