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Dr. Martin T. Auer MTU Department of Civil & Environmental Engineering ENVE5504 Surface Water Quality Modeling Lab 4. Mass Transport
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8 Lake Superior – 4/28/00 Completely-Mixed Lake: Lake Superior
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Distributed System: Lake Minnetonka
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Saginaw Bay Lake Huron 8 8 Horizontal Resolution: Saginaw Bay and Lake Huron
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8 8 Lake Superior – 8/25/00 Vertical Resolution – Lake Superior
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Advection and Diffusion
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Diffusion Diffusion is mediated by the magnitude of the diffusion coefficient and the concentration gradient. How do we express this mathematically?
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Scales of Diffusion Molecular diffusion is the net transport of molecules from a region of higher concentration to one of lower concentration by random molecular motion. Eddy or turbulent diffusion is a diffusive process by which substances are mixed due to eddy motion. Eddys range broadly in size and energy and thus also does the turbulent diffusion coefficient.
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Mathematics of Diffusion Fick’s 1 st Law E E Diffusion Mass Balance
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Mathematics of Diffusion X-direction E C
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