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The Fractional Resistance Offered by Liquid Phase is the ratio of resistance offered by the liquid film in contact with the gas phase to the overall liquid phase mass transfer coefficient. It quantifies the proportion of total mass transfer resistance that occurs in the liquid phase.
The calculator uses the formula:
Where:
Explanation: The formula calculates the ratio of liquid film resistance to the overall resistance in mass transfer processes, helping to understand the relative contribution of the liquid phase to the total mass transfer resistance.
Details: Calculating fractional resistance helps in designing and optimizing mass transfer equipment by identifying which phase (liquid or gas) offers the dominant resistance to mass transfer. This information is crucial for improving efficiency in processes like absorption, distillation, and extraction.
Tips: Enter the liquid phase mass transfer coefficient and overall liquid phase mass transfer coefficient in mol/s·m². Both values must be positive numbers greater than zero.
Q1: What does a high fractional resistance value indicate?
A: A high FRₗ value indicates that the liquid phase offers significant resistance to mass transfer compared to the overall resistance, suggesting that improvements should focus on enhancing liquid phase mass transfer.
Q2: What are typical ranges for mass transfer coefficients?
A: Mass transfer coefficients vary widely depending on the system and conditions, typically ranging from 10⁻⁶ to 10⁻² mol/s·m² for liquid phases in various industrial applications.
Q3: How is this calculation used in industrial applications?
A: This calculation is used to optimize mass transfer equipment design, determine the controlling resistance in processes, and improve efficiency in chemical engineering operations.
Q4: Can fractional resistance be greater than 1?
A: No, fractional resistance is a ratio between 0 and 1, where 0 indicates no resistance from the liquid phase and 1 indicates all resistance comes from the liquid phase.
Q5: What factors affect liquid phase mass transfer coefficient?
A: Factors include fluid properties (viscosity, density, diffusivity), flow conditions (velocity, turbulence), and equipment geometry (surface area, contact patterns).