Rhodamine WT is a fluorescent dye commonly used as for tracer studies in environmental settings. A mass
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Question:
- Rhodamine WT is a fluorescent dye commonly used as for tracer studies in environmental settings. A mass of 10 g of rhodamine WT is injected into a stream with a constant cross- sectional area of 4 m2. The dye is rapidly mixed across the cross-section of the stream so that it can be considered at a 1-D point source along the direction of stream flow. The dye cloud is visually estimated to be 110 m wide (along the stream) at a measuring station downstream, 90 minutes after the initial release.
- a) Assuming the visual estimate of the dye cloud is the 20sigma width, calculate the effective diffusivity in the stream between the release point and the measuring station.
- b) Calculate the max concentration of the dye cloud at this point.
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