Molar Flux of Diffusing Component A for Equimolar Diffusion with B based on Partial Pressure of A Calculator

Molar Flux Formula:

\[ N_A = \frac{D_{AB}}{R \cdot T \cdot \delta} \cdot (P_{A1} - P_{A2}) \]

Diffusion Coefficient (D_AB):

m²/s

Temperature of Gas:

Film Thickness:

Partial Pressure of A (Point 1):

Partial Pressure of A (Point 2):

Molar Flux of A (mol/s·m²):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Molar Flux of Diffusing Component A?

Definition: Molar flux is the amount of substance (in moles) that passes through a unit area per unit time during diffusion.

Purpose: This calculation is essential in chemical engineering for designing separation processes, reactors, and mass transfer equipment.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ N_A = \frac{D_{AB}}{R \cdot T \cdot \delta} \cdot (P_{A1} - P_{A2}) \]

Where:

\( N_A \) — Molar flux of component A (mol/s·m²)
\( D_{AB} \) — Diffusion coefficient (m²/s)
\( R \) — Universal gas constant (8.314 J/mol·K)
\( T \) — Absolute temperature (K)
\( \delta \) — Film thickness (m)
\( P_{A1}, P_{A2} \) — Partial pressures of A at points 1 and 2 (Pa)

Explanation: The formula calculates the molar flux based on Fick's law of diffusion for equimolar counter-diffusion.

3. Importance of Molar Flux Calculation

Details: Accurate molar flux calculations are crucial for designing efficient mass transfer operations in chemical processes.

4. Using the Calculator

Tips: Enter the diffusion coefficient, temperature, film thickness, and partial pressures at both points. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is equimolar counter-diffusion?
A: It's when two components diffuse at equal molar rates in opposite directions, common in binary systems.

Q2: What are typical values for diffusion coefficients?
A: For gases, typically 10⁻⁵ to 10⁻⁴ m²/s; for liquids, 10⁻⁹ to 10⁻¹⁰ m²/s.

Q3: How does temperature affect molar flux?
A: Higher temperature generally increases diffusion coefficient and thus molar flux.

Q4: What is the film thickness in mass transfer?
A: It's the hypothetical stagnant layer where concentration gradients exist.

Q5: Can this calculator be used for liquids?
A: Yes, but ensure proper units (especially for partial pressures which would be replaced by concentrations).