Height of Transfer Unit Formula:
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Definition: Height of Transfer Unit (HOG) is a measure of the effectiveness of mass transfer between gas and liquid phases in a packed column.
Purpose: It helps chemical engineers design and evaluate packed columns for separation processes like absorption or distillation.
The calculator uses the formula:
Where:
Explanation: The formula relates the mass transfer characteristics to the physical dimensions of the packed column.
Details: Accurate HOG calculation ensures proper column design, efficient mass transfer, and optimal separation performance.
Tips: Enter the molar gas flowrate, mass transfer coefficient, interfacial area per volume, and total pressure. All values must be > 0.
Q1: What affects the height of transfer unit?
A: Packing type, fluid properties, flow rates, and system pressure all influence HOG.
Q2: How is KG determined experimentally?
A: Through mass transfer experiments or correlations based on dimensionless numbers.
Q3: What's a typical range for HOG in packed columns?
A: Typically 0.2-1.5 meters, depending on packing and system characteristics.
Q4: How does HOG relate to column height?
A: Total column height = HOG × number of transfer units (NOG) needed for separation.
Q5: What's the difference between HOG and HETP?
A: HOG is for mass transfer, HETP (Height Equivalent to Theoretical Plate) is for equilibrium stages.