Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26880
Title: Flow induced by a turbulent jet under random waves
Authors: Tam, BYF
Li, CW 
Keywords: Jet
Jet-wave interaction
Random waves
Issue Date: 2008
Publisher: Taylor & Francis published on behalf of the International Association for Hydro-Environment Engineering and Research
Source: Journal of hydraulic research, 2008, v. 46, no. 6, p. 820-829 How to cite?
Journal: Journal of hydraulic research 
Abstract: The flow characteristics of a vertical turbulent jet discharged in random-waves environment have been investigated experimentally to assess the dilution of wastewater discharge in coastal areas. The results show that additional wave induced mixing is significant, which is reflected from the substantial increase in jet width and turbulence, as well as the rapid decrease in centerline velocity and shortening of jet potential core. The jet-wave interaction generates two flow regimes; jet-momentum dominated near field (JDNF) and wave-momentum dominated far field (WDFF). Comparing to those of jet flow in regular waves, the transition point between the two regimes is closer to the jet outlet and the velocity decay in WDFF is milder. A Lagrangian integral model has been developed to predict the characteristics of jet in random waves. Using the commonly adopted values of the radial and forced entrainment coefficients, the computed results match the experimental data closely for cases of small to medium waves (usig/W0 < 0.05, usig = mid-depth maximum orbital velocity, W0 = jet outlet velocity), while for large waves the jet width is underpredicted, showing that the entrainment coefficients are wave dependent.
URI: http://hdl.handle.net/10397/26880
ISSN: 0022-1686
EISSN: 1814-2079
DOI: 10.3826/jhr.2008.2989
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