Liquid Phase Mass Transfer Coefficient By Two Film Theory Calculator

Two Film Theory Equation:

\[ K_x = \frac{1}{\left(\frac{1}{k_y \cdot H}\right) + \left(\frac{1}{k_x}\right)} \]

Gas Phase Mass Transfer Coefficient (k_y):

mol/s·m²

Henry's Constant (H):

Liquid Phase Mass Transfer Coefficient (k_x):

mol/s·m²

Overall Liquid Phase Mass Transfer Coefficient (K_x):

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1. What is the Two Film Theory?

The Two Film Theory is a fundamental concept in mass transfer operations that describes the transfer of a component between two phases. It assumes that resistance to mass transfer is concentrated in two thin films adjacent to the interface, one in each phase.

2. How Does the Calculator Work?

The calculator uses the Two Film Theory equation:

\[ K_x = \frac{1}{\left(\frac{1}{k_y \cdot H}\right) + \left(\frac{1}{k_x}\right)} \]

Where:

\( K_x \) — Overall Liquid Phase Mass Transfer Coefficient (mol/s·m²)
\( k_y \) — Gas Phase Mass Transfer Coefficient (mol/s·m²)
\( H \) — Henry's Constant (-)
\( k_x \) — Liquid Phase Mass Transfer Coefficient (mol/s·m²)

Explanation: The equation calculates the overall mass transfer coefficient based on the individual phase resistances and Henry's constant, which relates gas and liquid phase concentrations.

3. Importance of Mass Transfer Coefficient Calculation

Details: Accurate calculation of mass transfer coefficients is crucial for designing and optimizing separation processes such as absorption, distillation, and extraction in chemical engineering applications.

4. Using the Calculator

Tips: Enter gas phase mass transfer coefficient in mol/s·m², Henry's constant (dimensionless), and liquid phase mass transfer coefficient in mol/s·m². All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the physical significance of Henry's Constant?
A: Henry's Constant represents the solubility of a gas in a liquid. A higher value indicates lower solubility, while a lower value indicates higher solubility.

Q2: When is the Two Film Theory most applicable?
A: The theory is most applicable when the interface is well-defined and the mass transfer resistance is indeed concentrated in thin films near the interface, which is typical in many gas-liquid contact operations.

Q3: What are typical ranges for mass transfer coefficients?
A: Mass transfer coefficients typically range from 10^-6 to 10^-2 mol/s·m², depending on the system, flow conditions, and physical properties of the fluids.

Q4: Are there limitations to the Two Film Theory?
A: Yes, the theory assumes steady-state conditions, constant film thickness, and no chemical reactions. It may not accurately represent systems with high turbulence or complex interfacial phenomena.

Q5: How does temperature affect mass transfer coefficients?
A: Temperature generally increases mass transfer coefficients by reducing viscosity and increasing diffusion rates, though the effect on Henry's constant varies with the specific gas-liquid system.