Dense gas simulation flows over rough surfaces

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Title Dense gas simulation flows over rough surfaces
Author(s) Wayne D. Peters, Steven R. Cogswell, James E. S. Venart
Journal Heat and Mass Transfer in Chemical Process Industry Accidents, Journal of Hazardous Materials
Date 1996
Volume 46
Issue 2-3
Start page 215
End page 223
Abstract Mixing within a gravity current head, passing over a rough surface, is assessed using a two-dimensional quantitative full-field flow visualization technique. The method combines salt-water modelling, laser-induced dye fluorescence and video image enhancement. The mixing mechanisms that occur internal to the head structure are shown to play a major role in the overall dilution process and to be significantly affected by surface roughness. The effect of surface roughness is consequential for the accurate prediction of heavier-than-air gas dispersions, for instance. Flows with Reynolds numbers of 500, 1000 and 1500 and density differences of 0.5, 1.0 and 1.5% are considered. Results are presented for flows over two surface types, smooth and rough with a relative roughness element height of 0.35 and frontal obstruction of 50% based on roughness element diameter.
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