Dilution of toxic gases and smoke emissions from residential chimneys using a low-cost cap

Sharifian, Ahmad and Hashempour, Javad (2012) Dilution of toxic gases and smoke emissions from residential chimneys using a low-cost cap. In: 18th Australasian Fluid Mechanics Conference (AFMC 2012), 3-7 Dec 2012, Launceston, Australia.

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Abstract

Smoke and toxic gases emitted from chimneys present health hazard. Their concentration should be minimised before reaching the ground. The wind lowers the concentration before it reaches the surface. However, heavier than air toxic gases flow downward which is particularly problematic in the case of low wind speeds in high-density populated areas. Two effective solutions are to extend the height of the chimney or to employ a filter but generally these solutions are not practical or economical for residential applications. An innovative low-cost chimney cap is proposed to dilute toxic gases within the chimney before ejection. The configuration of the cap is inspired from chambers which are currently used to generate fire-whirl in the laboratory. The cap consists of two identical half cylinders which are placed off-centre at the top of the chimney. The previous experiments indicate that the entrained air swirls around the central vertical axis of the chamber and generates a whirling motion. The chimney discharge and the exhaust concentration are computed by modelling the cap. The computational results indicate that such a configuration not only is able to reduce the concentration of the discharge, but also is able to increase the discharge at low wind speeds.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © The 18th Australasian Fluid Mechanics Conference. This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 11 Feb 2013 04:33
Last Modified: 05 Mar 2018 05:52
Uncontrolled Keywords: dilution; chimney; cap
Fields of Research : 04 Earth Sciences > 0401 Atmospheric Sciences > 040101 Atmospheric Aerosols
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
12 Built Environment and Design > 1204 Engineering Design > 120401 Engineering Design Empirical Studies
Socio-Economic Objective: D Environment > 96 Environment > 9601 Air Quality > 960106 Urban and Industrial Air Quality
URI: http://eprints.usq.edu.au/id/eprint/22419

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