Molar Flux Formula:
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Definition: Molar flux (NA) is the amount of substance (in moles) that passes through a unit area per unit time during diffusion.
Purpose: This calculator determines the molar flux of component A in an equimolar counter-diffusion system based on concentration differences.
The calculator uses Fick's first law of diffusion:
Where:
Explanation: The flux is directly proportional to the concentration gradient and diffusion coefficient, and inversely proportional to the diffusion path length.
Details: Accurate flux calculations are essential for designing separation processes, chemical reactors, and mass transfer equipment.
Tips: Enter the diffusion coefficient, film thickness, and concentrations at both positions. All values must be positive numbers.
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: How do I determine the diffusion coefficient?
A: DAB can be found experimentally or estimated using empirical correlations.
Q3: What affects the film thickness?
A: Flow conditions, system geometry, and physical properties influence the boundary layer thickness.
Q4: Can this be used for non-equimolar diffusion?
A: No, this calculator is specifically for equimolar counter-diffusion cases.
Q5: What units should I use?
A: Use consistent SI units: meters for length, seconds for time, and moles per cubic meter for concentration.