7. Interphase Mass Transfer – Flux and Mass Transfer Resistance
The chapter focuses on interphase mass transfer, particularly emphasizing Fick's law of diffusion and its implications for environmental quality. It outlines how diffusion is influenced by medium properties, molecular weight, and viscosity, and presents models for understanding mass transfer in sediment and water systems. Resistance to mass transfer and its correlation with hydrodynamics are also discussed.
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What we have learnt
- Flux is defined by Fick's law of diffusion and shows the movement of substances from high to low concentration.
- Diffusion coefficients depend on factors such as the medium density, temperature, molecular weight, and viscosity of the fluid.
- Mass transfer rates can change based on the system's conditions, and hydrodynamic properties play a crucial role in determining resistance.
Key Concepts
- -- Fick's Law of Diffusion
- A law that describes the flux of a substance across a surface in response to a concentration gradient.
- -- Diffusion Coefficient (DA)
- A measure of how easily a substance diffuses through a medium, affected by factors such as molecular weight and temperature.
- -- Resistance to Mass Transfer
- The opposition to the transfer of mass across a phase boundary, influenced by medium properties and flow dynamics.
- -- Hydrodynamics
- The study of fluids in motion, which impacts how substances are transferred in environmental systems.
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