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Mass Transfer Coefficient by Film Theory Calculator

Convective Mass Transfer Coefficient Formula:

\[ k_L = \frac{D_{AB}}{\delta} \]

m²/s
m
m/s

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1. What is Mass Transfer Coefficient by Film Theory?

Definition: This calculator determines the convective mass transfer coefficient based on the film theory of mass transfer.

Purpose: It helps chemical engineers and researchers estimate the mass transfer rate between phases in processes like absorption, distillation, and extraction.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ k_L = \frac{D_{AB}}{\delta} \]

Where:

Explanation: The mass transfer coefficient is directly proportional to the diffusion coefficient and inversely proportional to the film thickness.

3. Importance of Mass Transfer Coefficient

Details: The mass transfer coefficient is crucial for designing separation processes, predicting reaction rates, and optimizing industrial equipment.

4. Using the Calculator

Tips: Enter the diffusion coefficient (DAB) in m²/s and film thickness (δ) in meters. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is typical range for diffusion coefficients?
A: For gases: 10⁻⁵ to 10⁻⁴ m²/s; for liquids: 10⁻⁹ to 10⁻¹⁰ m²/s.

Q2: How is film thickness determined?
A: Film thickness depends on flow conditions and can be estimated from boundary layer theory or experimental correlations.

Q3: What are limitations of film theory?
A: Film theory assumes a stagnant film and constant concentration gradient, which may not hold in turbulent flow.

Q4: How does temperature affect the calculation?
A: Temperature strongly affects DAB (increases with temperature) but has less effect on δ.

Q5: Can this be used for gas-phase mass transfer?
A: Yes, but gas-phase coefficients are typically much larger than liquid-phase ones.

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