Convective Mass Transfer Coefficient Formula:
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Definition: This calculator determines the convective mass transfer coefficient based on the surface renewal theory, which models mass transfer at fluid interfaces.
Purpose: It helps chemical engineers and researchers estimate mass transfer rates in processes like absorption, distillation, and extraction.
The calculator uses the formula:
Where:
Explanation: The mass transfer coefficient is calculated as the square root of the product of the diffusion coefficient and surface renewal rate.
Details: Accurate estimation of mass transfer coefficients is crucial for designing efficient separation processes and reactors in chemical engineering.
Tips: Enter the diffusion coefficient in m²/s and surface renewal rate in 1/s. Both values must be positive numbers.
Q1: What is surface renewal theory?
A: It's a model that assumes fluid elements at the interface are periodically replaced by fresh elements from the bulk fluid.
Q2: How do I determine the diffusion coefficient?
A: Diffusion coefficients can be found in chemical engineering handbooks or estimated using empirical correlations.
Q3: What factors affect surface renewal rate?
A: Fluid turbulence, interfacial velocity gradients, and system geometry influence the renewal rate.
Q4: What are typical values for kL?
A: Values typically range from 10-5 to 10-3 m/s depending on the system and conditions.
Q5: Can this be used for gas-liquid systems?
A: Yes, the surface renewal theory applies to both liquid-liquid and gas-liquid interfaces.