Formula Used:
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Definition: The saturated fugacity coefficient (φ1sat) is the ratio of the saturated fugacity of component 1 to its saturated pressure.
Purpose: It quantifies the deviation of a real gas from ideal gas behavior at saturation conditions.
The calculator uses the formula:
Where:
Explanation: The formula accounts for non-ideal gas behavior using the second virial coefficient at the saturation pressure and temperature.
Details: Accurate fugacity coefficients are essential for phase equilibrium calculations, chemical process design, and thermodynamic modeling.
Tips: Enter the second virial coefficient (B11) in m³, saturated pressure in Pa, and temperature in Kelvin. All values must be positive.
Q1: What is the physical meaning of the fugacity coefficient?
A: It represents how much a real gas deviates from ideal gas behavior (φ=1 for ideal gas).
Q2: Where can I find second virial coefficient values?
A: They are typically found in thermodynamic databases or calculated from equations of state.
Q3: What units should be used for input values?
A: B11 in m³, P1sat in Pascals, and T in Kelvin.
Q4: When is this calculation most important?
A: For high-pressure systems or when dealing with strongly non-ideal mixtures.
Q5: What does a fugacity coefficient greater than 1 indicate?
A: It indicates positive deviation from ideal gas behavior (repulsive intermolecular forces dominate).