Molar Flux Formula:
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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.
The calculator uses the formula:
Where:
Explanation: The formula calculates the molar flux based on Fick's law of diffusion for equimolar counter-diffusion.
Details: Accurate molar flux calculations are crucial for designing efficient mass transfer operations in chemical processes.
Tips: Enter the diffusion coefficient, temperature, film thickness, and partial pressures at both points. All values must be positive.
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).