Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/10173
Title: Turbulent transport of passive scalar behind line sources in an unstably stratified open channel flow
Authors: Liu, CH
Leung, DYC
Keywords: Atmospheric boundary layer (ABL)
Direct numerical simulation (DNS)
Line sources
Open channel flow
Unstable stratification
Vertical plume meandering
Issue Date: 2006
Publisher: Pergamon Press
Source: International journal of heat and mass transfer, 2006, v. 49, no. 23-24, p. 4305-4324 How to cite?
Journal: International journal of heat and mass transfer 
Abstract: This study employs a direct numerical simulation (DNS) technique to study the flow, turbulence structure, and passive scalar plume transport behind line sources in an unstably stratified open channel flow. The scalar transport behaviors for five emission heights (zs = 0, 0.25H, 0.5H, 0.75H, and H, where H is the channel height) at a Reynolds number of 3000, a Prandtl number and a Schmidt number of 0.72, and a Richardson number of -0.2 are investigated. The vertically meandering mean plume heights and dispersion coefficients calculated by the current DNS model agree well with laboratory results and field measurements in literature. It is found that the plume meandering is due to the movement of the positive and negative vertical turbulent scalar fluxes above and below the mean plume heights, respectively. These findings help explaining the plume meandering mechanism in the unstably stratified atmospheric boundary layer.
URI: http://hdl.handle.net/10397/10173
ISSN: 0017-9310
EISSN: 1879-2189
DOI: 10.1016/j.ijheatmasstransfer.2006.05.026
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