4.3 - General Expression for Effective Diffusivity
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Practice Questions
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What is effective diffusivity (DA3)?
💡 Hint: Think about how substances migrate through different materials.
Define porosity.
💡 Hint: It relates to how much space exists within solids.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does DA3 represent in diffusion studies?
💡 Hint: Think of it as the rate of movement through porous materials.
True or False: Higher porosity increases diffusion rates.
💡 Hint: Relate this to paths available for substances.
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Challenge Problems
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A contaminated site has a porosity of 0.25 and an effective diffusivity of 2.5e-5 m²/s. If the retardation factor is 1.5, calculate the rate of contaminant movement over time.
💡 Hint: How does the retardation factor influence the overall migration speed?
Assuming a linear concentration gradient exists across a distance of 4 meters with a given effective diffusivity of 1.2e-4 m²/s. How long will it take for the substance to cover this distance?
💡 Hint: What is the formula for time based on distance and diffusivity?
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