doi:10.3850/978-981-08-7724-8_16-04

ABSTRACT

A strong curved plume method that includes the influences of the horizontal momentum of the smoke layer at the balcony edge and end entrainment has been developed for assessing air entrainment into thermal plumes that spill over a balcony edge into an atrium void. This is shown to be asymptotic to two dimensional, line plume (near the balcony) and three dimensional axisymmetric plume limits (in the far field). It is shown that a virtual line source deduced from the curved plume analysis and located a distance approximately three layer depths below the balcony edge provides a reasonably good description of mass fluxes for plumes with and without end entrainment. The curved plume method has been compared with CFD predictions from the JASMINE CFD model and with Harrison’s new comprehensive experimental data. The method shows good correspondence with the data sufficiently well to be a simple option for the inclusion of end entrainment effects.

Keywords: Curved plume, Balcony spill plume, Entrainment.

© 2011 CPD Unit, University of Leeds