Numerical study of cloud cavitation effects on hydrophobic hydrofoils

Jonghyun Kim, Joon Sang Lee

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

To explore the effect of hydrophobicity on cloud cavitation, the behaviors of cloud cavitation over the Clark-Y hydrofoil under various slip condition were investigated. Large eddy simulation (LES) was used for the turbulence model. The mass transfer model, which was considered to be a two-phase mixture flow, was used for the vaporization and condensation processes in the transport equation. The volume of fluid (VOF) scheme was used to track the interface of the dispersed phase by using the local volume fraction. Slip strength was controlled using the friction coefficient. The cavitation model in this study agreed with experimental and previous numerical studies. The results show that as the slip strength grew stronger, the friction drag was reduced; the cavity became longer and the shedding frequency decreased. For this reason, cloud cavitation is stabilized in condition of strong slip strength. Thus, a relatively weak re-entrant jet occurs in conditions of strong slip strength which gives rise to small amount of vapor shedding at the closure. This means that cloud cavitation instability was alleviated as the hydrophobicity increased.

Original languageEnglish
Pages (from-to)591-603
Number of pages13
JournalInternational Journal of Heat and Mass Transfer
Volume83
DOIs
Publication statusPublished - 2015 Apr

Fingerprint

hydrofoils
Hydrofoils
cavitation flow
Cavitation
slip
Hydrophobicity
hydrophobicity
friction drag
Friction
turbulence models
Large eddy simulation
large eddy simulation
Turbulence models
Vaporization
coefficient of friction
closures
mass transfer
Drag
Condensation
Volume fraction

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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title = "Numerical study of cloud cavitation effects on hydrophobic hydrofoils",
abstract = "To explore the effect of hydrophobicity on cloud cavitation, the behaviors of cloud cavitation over the Clark-Y hydrofoil under various slip condition were investigated. Large eddy simulation (LES) was used for the turbulence model. The mass transfer model, which was considered to be a two-phase mixture flow, was used for the vaporization and condensation processes in the transport equation. The volume of fluid (VOF) scheme was used to track the interface of the dispersed phase by using the local volume fraction. Slip strength was controlled using the friction coefficient. The cavitation model in this study agreed with experimental and previous numerical studies. The results show that as the slip strength grew stronger, the friction drag was reduced; the cavity became longer and the shedding frequency decreased. For this reason, cloud cavitation is stabilized in condition of strong slip strength. Thus, a relatively weak re-entrant jet occurs in conditions of strong slip strength which gives rise to small amount of vapor shedding at the closure. This means that cloud cavitation instability was alleviated as the hydrophobicity increased.",
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Numerical study of cloud cavitation effects on hydrophobic hydrofoils. / Kim, Jonghyun; Lee, Joon Sang.

In: International Journal of Heat and Mass Transfer, Vol. 83, 04.2015, p. 591-603.

Research output: Contribution to journalArticle

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AU - Kim, Jonghyun

AU - Lee, Joon Sang

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AB - To explore the effect of hydrophobicity on cloud cavitation, the behaviors of cloud cavitation over the Clark-Y hydrofoil under various slip condition were investigated. Large eddy simulation (LES) was used for the turbulence model. The mass transfer model, which was considered to be a two-phase mixture flow, was used for the vaporization and condensation processes in the transport equation. The volume of fluid (VOF) scheme was used to track the interface of the dispersed phase by using the local volume fraction. Slip strength was controlled using the friction coefficient. The cavitation model in this study agreed with experimental and previous numerical studies. The results show that as the slip strength grew stronger, the friction drag was reduced; the cavity became longer and the shedding frequency decreased. For this reason, cloud cavitation is stabilized in condition of strong slip strength. Thus, a relatively weak re-entrant jet occurs in conditions of strong slip strength which gives rise to small amount of vapor shedding at the closure. This means that cloud cavitation instability was alleviated as the hydrophobicity increased.

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