Air Entrainment at a Two-Dimensional Plunging Jet of Water

Hinton, Craig (). Air Entrainment at a Two-Dimensional Plunging Jet of Water B.Sc Thesis, School of Engineering, The University of Queensland.

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Author Hinton, Craig
Thesis Title Air Entrainment at a Two-Dimensional Plunging Jet of Water
School, Centre or Institute School of Engineering
Institution The University of Queensland
Thesis type B.Sc Thesis
Supervisor Hubert Chansone
Graham Illidgee
Richard Manasseh
Language eng
Subjects 0913 Mechanical Engineering
Formatted abstract
Air bubble entrainment may take place at the impingement boundary of a plunging jet when its impact velocity exceeds a critical value. Numerous applications of plunging jets occur in nature and industry. A waterfall plunging into a pool below and a plunging breaking wave are examples of naturally occurring pseudo-two-dimensional plunging water jets. The food processing industry as well as sewerage and water treatment plants use plunging jets, with the process of air entrainment critical to their application of aeration and mixing requirements. Despite many industrial applications, few studies have detailed the air bubble properties in developing shear layers next to impingement.

In the present study air content, bubble frequency and bubble size distributions were investigated for a range of jet impact velocities and jet fall lengths. Air content and bubble frequency results are consistent with previous work conducted with differing flow conditions. The air content distributions are found to closely follow a solution of the advective diffusion process.

Bubble size distribution data provided new original results and enabled correlation with the air content and bubble frequency. Acoustic recordings of bubbles were conducted and the data analysis was compared with conductivity probe measurements of bubble chord sizes.

It is the purpose of this research thesis to present new experimental results and to contribute to an increase in knowledge towards air entrainment of two-dimensional plunging water jets. Also to find relations between bubble size, air content and bubble frequency with a critical investigation of the effectiveness and accuracy of measuring bubble sizes using the bubbles acoustic properties.
Keyword air entrainment
plunging jet

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Tue, 06 Jan 2015, 12:33:39 EST by Ahmed Taha Siddiqui on behalf of Scholarly Communication and Digitisation Service