9. Interphase Mass Transfer – Individual and Overall Mass Transfer Coefficients
The chapter discusses interface mass transfer, particularly focusing on air-water interactions and the associated resistances at the mass transfer interfaces. It elaborates on the impact of mixing and boundary layers on concentration gradients, highlighting the difficulty of measuring conditions at molecular levels while emphasizing the assumptions made in mass transfer studies. The steady-state assumption plays a significant role in simplifying the analysis of flux across interfaces.
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What we have learnt
- Mass transfer occurs at the interface between different phases.
- The concentration profiles and gradients are influenced by mixing and resistance at the interface.
- The steady-state assumption is critical in analyzing flux and concentration at the interface.
Key Concepts
- -- Interface Mass Transfer
- The movement of mass from one phase to another at the boundary separating those phases.
- -- Concentration Gradient
- The change in concentration of a substance across a distance, influencing the rate of mass transfer.
- -- Steady State Assumption
- An assumption stating that the rate of accumulation of mass at the interface is zero, meaning the mass entering the interface equals the mass leaving.
- -- Mass Transfer Coefficient
- A value representing the mass transfer rate per unit area and per unit concentration difference, crucial for quantifying mass transfer.
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