Formula Used:
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Definition: The gas phase mass transfer coefficient is a diffusion rate constant that relates the mass transfer rate, mass transfer area, and concentration change as driving force.
Purpose: It quantifies how quickly a component can transfer from the gas phase to another phase (typically liquid) in mass transfer operations.
The calculator uses the formula:
Where:
Explanation: The overall mass transfer coefficient is divided by the fractional resistance offered by the gas phase to determine the gas phase mass transfer coefficient.
Details: This coefficient is crucial in designing and analyzing gas-liquid contactors like absorption towers, strippers, and scrubbers.
Tips: Enter the overall gas phase mass transfer coefficient and the fractional resistance (between 0 and 1). All values must be positive numbers.
Q1: What is the typical range for gas phase mass transfer coefficients?
A: Values typically range from 0.01 to 1 mol/(s·m²), depending on the system and operating conditions.
Q2: How is fractional resistance determined?
A: It's the ratio of gas phase resistance to total resistance, often determined experimentally or from correlations.
Q3: What affects the gas phase mass transfer coefficient?
A: Factors include temperature, pressure, gas velocity, and the physical properties of the components.
Q4: Can the fractional resistance be zero?
A: No, it must be greater than zero and less than or equal to one.
Q5: What units should I use for inputs?
A: Use consistent units - mol/(s·m²) for mass transfer coefficients and dimensionless fraction for resistance.