Molar Flux Formula:
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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.
The calculator uses the formula:
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.
Details: Accurate molar flux calculations are essential for designing separation processes, mass transfer equipment, and understanding diffusion phenomena in chemical engineering.
Tips: Enter all required parameters with appropriate units. Mole fractions should be between 0 and 1. All values must be positive.
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.