Wohl Parameter (c) of Real Gas using Wohl Equation given Reduced and Critical Parameters Calculator

Wohl Parameter c Formula:

\[ c = \left( P_r \cdot P_c - \frac{R \cdot (T_r \cdot T_c)}{(V'_r \cdot V'_c - b)} + \frac{a}{(T_r \cdot T_c) \cdot (V'_r \cdot V'_c) \cdot (V'_r \cdot V'_c - b)} \right) \cdot \left( (T_r \cdot T_c)^2 \cdot (V'_r \cdot V'_c)^3 \right) \]

Reduced Pressure (P_r):

Critical Pressure (P_c) (Pa):

Reduced Temperature (T_r):

Critical Temperature (T_c) (K):

Reduced Molar Volume (V'_r):

Critical Molar Volume (V'_c) (m³/mol):

Wohl Parameter (b):

Wohl Parameter (a):

Wohl Parameter (c):

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1. What is Wohl Parameter (c)?

Definition: Wohl parameter c is an empirical parameter characteristic to equation obtained from Wohl model of real gas.

Purpose: It's used in the Wohl equation of state to describe the behavior of real gases, particularly accounting for molecular interactions and volume effects.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

\( c \) — Wohl parameter c (result)
\( P_r \) — Reduced Pressure (dimensionless)
\( P_c \) — Critical Pressure (Pascal)
\( T_r \) — Reduced Temperature (dimensionless)
\( T_c \) — Critical Temperature (Kelvin)
\( V'_r \) — Reduced Molar Volume (dimensionless)
\( V'_c \) — Critical Molar Volume (m³/mol)
\( a, b \) — Other Wohl parameters
\( R \) — Universal gas constant (8.314 J/mol·K)

3. Importance of Wohl Parameter Calculation

Details: Accurate calculation of Wohl parameters is essential for modeling real gas behavior in chemical engineering applications, particularly at high pressures where ideal gas law fails.

4. Using the Calculator

Tips: Enter all required parameters. Default values are provided for reference. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for Wohl parameters?
A: Parameters vary by substance. For example, for CO₂: a ≈ 3.59, b ≈ 0.0427, c ≈ 2.42×10⁷.

Q2: Why use reduced parameters?
A: Reduced parameters allow for generalized correlations that can be applied to different substances.

Q3: How accurate is the Wohl equation?
A: It's reasonably accurate for many real gases, though more complex equations (like PR or SRK) may be better for some applications.

Q4: What units should I use?
A: Use consistent SI units: Pascals for pressure, Kelvin for temperature, and m³/mol for volume.

Q5: Can I use this for liquid phases?
A: The Wohl equation can model both gas and liquid phases, but accuracy may vary for liquids.