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Molar Flux of Diffusing Component A through Non-Diffusing B based on Mole Fractions of A and LMPP Calculator

Molar Flux Formula:

\[ N_A = \frac{D_{AB} \cdot P_t^2}{\delta} \cdot \frac{y_{A1} - y_{A2}}{P_{B,lm}} \]

m²/s
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1. What is Molar Flux of Diffusing Component A?

Definition: Molar flux (NA) measures the amount of substance (in moles) that diffuses through a unit area per unit time in a binary gas mixture.

Purpose: This calculator determines the molar flux of component A through non-diffusing component B based on mole fractions and log mean partial pressure.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ N_A = \frac{D_{AB} \cdot P_t^2}{\delta} \cdot \frac{y_{A1} - y_{A2}}{P_{B,lm}} \]

Where:

Explanation: The formula accounts for the concentration gradient (via mole fractions), diffusion characteristics, and the logarithmic mean partial pressure of the non-diffusing component.

3. Importance of Molar Flux Calculation

Details: Accurate molar flux calculations are essential for designing separation processes, mass transfer equipment, and understanding diffusion phenomena in chemical engineering.

4. Using the Calculator

Tips: Enter all required parameters with appropriate units. Mole fractions should be between 0 and 1. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is the log mean partial pressure?
A: It's the logarithmic average of the partial pressures of component B at two different points in the system.

Q2: When is this equation applicable?
A: For steady-state diffusion of component A through stagnant (non-diffusing) component B in a binary gas mixture.

Q3: How do I determine the diffusion coefficient?
A: It can be measured experimentally or estimated using theoretical correlations based on gas properties.

Q4: What are typical units for molar flux?
A: The standard SI unit is moles per square meter per second (mol/(s·m²)).

Q5: Can this be used for liquid-phase diffusion?
A: No, this specific form is for gas-phase diffusion. Liquid-phase diffusion uses different formulations.

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