Poynting Factor Formula:
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Definition: The Poynting Factor accounts for the change in fugacity as the pressure changes from saturated pressure to system pressure at constant temperature.
Purpose: It's used in thermodynamics to correct the fugacity of liquids when the system pressure differs from the saturation pressure.
The calculator uses the formula:
Where:
Explanation: The fugacity of the liquid phase is divided by the product of the saturated fugacity coefficient and saturated pressure to obtain the Poynting factor.
Details: The Poynting factor is crucial in phase equilibrium calculations, particularly when dealing with high-pressure systems where the pressure significantly affects the fugacity of liquid components.
Tips: Enter the fugacity of the liquid phase species in Pascals, the saturated fugacity coefficient (typically between 0 and 1), and the saturated pressure in Pascals. All values must be > 0.
Q1: What is the physical significance of the Poynting factor?
A: It represents the effect of pressure on the fugacity of a liquid component when the system pressure differs from its saturation pressure.
Q2: When does the Poynting factor become significant?
A: It becomes important when dealing with high-pressure systems where the pressure significantly exceeds the saturation pressure of the component.
Q3: What's a typical value range for the Poynting factor?
A: The Poynting factor is typically close to 1 at low pressures, but can deviate significantly at high pressures.
Q4: How do I find the fugacity of liquid phase species?
A: Fugacity can be calculated from experimental data or estimated using thermodynamic models like activity coefficient models or equations of state.
Q5: What units should I use for input values?
A: Use consistent units - Pascals for fugacity and pressure, while the fugacity coefficient is dimensionless.