Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Effects of a single roughness element on Venturi cavitation

단일 거칠기 요소가 벤투리 캐비테이션에 미치는 영향

  • Jongbin Hwang (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) ;
  • Yisu Shin (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) ;
  • Jooha Kim (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2022.11.11
  • Accepted : 2023.02.24
  • Published : 2023.03.31
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Abstract

In this study, we investigate the effects of a single roughness element on Venturi cavitation. The single roughness element of hemispherical shape is installed at the throat inlet of a Venturi tube. Since the wake behind the roughness element induces an additional pressure drop, cavitation inception occurs at a higher Cavitation number for the Venturi model with the single roughness element than for the Venturi model with no roughness. Cavitation bubbles form along the wake of the roughness element and lengthen in the streamwise direction as the Cavitation number decreases, forming a longitudinal cavitation. With a further decrease in the Cavitation number, the longitudinal cavitation bubble merges with the sheet cavitation initiated from the exit edge of the Venturi tube throat, followed by the shedding of cloud cavitation. The merging of the longitudinal cavitation and sheet cavitation is accompanied by a sudden decrease in the discharge coefficient and an increase in the pressure loss coefficient as it chokes the flow inside the Venturi tube.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부의 집단연구지원사업(2021R1A4A1032023)을 통해 한국연구재단의 지원받아 수행되었으며, 이에 감사드립니다.

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