• Login
    View Item 
    •   DSpace Home
    • Professional Associations
    • IEM Journal
    • View Item
    •   DSpace Home
    • Professional Associations
    • IEM Journal
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Large eddy simulation of the effect of hat fux on pollutant dispersion in an urban street canyon

    Thumbnail
    View/Open
    02Dec2009.pdf (767.5Kb)
    Date
    2009-12
    Author
    Chan, Andy, Prof.
    Cheung, Eric
    Siddheshwar, Pradeep G., Dr.
    Metadata
    Show full item record
    Abstract
    The effect of heat flux on pollutant dispersion in an urban street canyon with fixed aspect ratio of 1 is investigated under four different heating configurations: windward heating, leeward heating, ground heating, and walls and ground heating, using large-eddy simulations (LES). For each heating configuration, the Reynolds number is varied from 400 to 3,000 and the Grashof number from 80,000 to 800,000. The retention value (the ratio of pollutant remaining inside canyon to the total pollutant emitted) is used to compare the effect of heating on pollutant dispersion under each heating configuration. Numerical results show that the wind flow patterns, pollutant dispersion patterns and retention values depend not only on the canyon aspect ratio and inflow wind speed, but also on the strength of heating and the heating configuration. The most significant effect arises from the case of windward heating when the main vortex rotating in the clockwise direction is countered by the buoyancy effect near the windward wall; the pollutant accumulated near the leeward wall is therefore decreased. On the other hand, no significant change is observed in the wind flow and pollutant dispersion pattern for the cases of leeward, ground and walls and ground heating. As the strength of heating is increased gradually, the strength of the vortex rotating in the counter-clockwise direction at the lower corner of the windward wall also increases; this causes the pollutant to accumulate near the windward wall. A further increase in the strength of heating causes the formation of a third vortex above the second one, the pollutant accumulated near the windward wall is therefore increased.
    URI
    http://www.myiem.org.my/content/iem_journal_2009-180.aspx
    http://dspace.unimap.edu.my/123456789/13696
    Collections
    • IEM Journal [310]

    Atmire NV

    Perpustakaan Tuanku Syed Faizuddin Putra (PTSFP) | Send Feedback
     

     

    Browse

    All of UniMAP Library Digital RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Atmire NV

    Perpustakaan Tuanku Syed Faizuddin Putra (PTSFP) | Send Feedback