Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15902
Title: Vehicle queue effect on the characteristics of air flow, and exhaust scalar dispersion and distribution fields in the vehicle wake
Authors: Huang, JF
Chan, TL 
Keywords: Cold- and hot-wire technique
Scalar distribution region
Vehicle queue effect
Vehicle wake
Wind tunnel
Issue Date: 2012
Publisher: Pergamon Press
Source: International journal of heat and mass transfer, 2012, v. 55, no. 25-26, p. 7981-7990 How to cite?
Journal: International journal of heat and mass transfer 
Abstract: The characteristics of air flow, and vehicular exhaust scalar (i.e.; pollutant) dispersion and distribution fields in the near-wake region of a scale-model vehicle which was placed alone or behind the preceding one(s) in a closed-circuit wind tunnel facility were experimentally investigated for typical urban driving conditions. The wake structure behind a queue of studied vehicles is mainly dominated by the last one, while the preceding vehicle(s) will lead to a stronger downwash flow in the wake. For the vehicle with rear slant angle (α < 30°) which has a pair of trailing vortices in the wake flow, the vehicular exhaust jet plume will be mainly trapped inside these two trailing vortices and fills an "m-shaped" scalar distribution region behind the vehicle. Half of the m-shaped region which is on the vehicular tailpipe exit side shares a larger portion of scalar distribution than the other half. This unbalanced scalar distribution is enhanced by the preceding vehicle(s). For the vehicle with rear slant angle (α > 30°) which has a two-dimensional wake flow, the vehicular exhaust jet plume will be carried by such a wake flow to form an "n-shaped" scalar distribution region behind the vehicle with a peak scalar region at its center. The preceding vehicle(s) will further enlarge the n-shaped scalar distribution region and push the peak scalar region closer to the ground. It is clearly shown that the two- or three-dimensional flow behind the studied vehicle can provide different shapes of exhaust scalar dispersion and distribution fields in the vehicle wake.
URI: http://hdl.handle.net/10397/15902
ISSN: 0017-9310
EISSN: 1879-2189
DOI: 10.1016/j.ijheatmasstransfer.2012.08.031
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