Water tank experiment of gas diffusion from a stack in stably and unstably stratified layers under calm conditions |
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| Institution: | 1. School of the Environment, Faculty of Science and Engineering, Flinders University, Bedford Park, South Australia 5042, Australia;2. School of Civil Engineering, University of Queensland, St Lucia, Qld. 4072, Australia;3. Dept of Geography, University of Victoria, P.O. Box 3060, Station CSC, Victoria, BC V8W 3R4, Canada;4. Earth and Environmental Sciences & Geography, University of British Columbia, Okanagan, Kelowna, BC V1V 1V7, Canada;5. Dept of Geography, University of Guelph, Guelph, ON N1G2W1, Canada |
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| Abstract: | Water tank experiments were conducted to investigate plume rrise and diffusion of gases discharged from a stack under calm conditions with stable and unstable thermal stratifications.First, tracer liquid with fluorescent dye and salt was emitted from a model of a stack in a stably stratified layer and the behavior of a plume was recorded by video camera. Using these results. we obtained formulae for plume rise height, and horizontal and vertical width of a plume as a function of thedensimetric Froude number, stability ratio and time.After the completion of these experiments under stable conditions, an unstably stratified layer was developed from a ground surface by heating a floor and the resulting concentration distribution was measured with electric conductivity probes. Using these results, we analyzed the height of the convection layer and concentration distribution as a function of the overall Richardson number and time. |
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