Experimental characterization of air-entrainment in a plunging jet

Xiaoliang Qu, Afshin Goharzadeh, Lyes Khezzar, Arman Molki

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37 Scopus citations

Abstract

This paper presents a detailed experimental study of a plunging jet on a free liquid surface. An experimental characterization facility is designed and constructed for generating a vertical round water jet impinging on a free surface of a pool. The experimental analysis focuses on the jet penetration depth, its relation to impact velocity V j and free jet falling length L j. The results obtained are compared with previous studies. The flowmap for four different regimes, in terms of impact jet velocity is obtained. The details of the two-dimensional velocity field below the pool liquid free surface under a no-entrainment regime, are obtained using Particle Image Velocimetry (PIV) and reveal the spatial extent of the entrained region. The initial impact process and air cavity features are also investigated and compared with previous semi-theoretical results.

Original languageBritish English
Pages (from-to)51-61
Number of pages11
JournalExperimental Thermal and Fluid Science
Volume44
DOIs
StatePublished - Jan 2013

Keywords

  • Air entrainment
  • Flow map regime
  • Impinging jet
  • Particle Image Velocimetry

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