Class: `PressureDropFanning`

The PressureDropFanning class calculates the pressure drop (ΔP) in a pipe using the Fanning equation.
It is part of the ProcessPI Calculations module and inherits from CalculationBase.

📖 Description

The Fanning friction factor is a dimensionless number that relates the shear stress at the pipe wall to the kinetic energy of the fluid.
The Fanning equation is widely used in chemical and process engineering to calculate pipe pressure drops.

📊 Formula

The pressure drop is given by:

\[ \Delta P = 4 \cdot f_F \cdot \frac{L}{D} \cdot \frac{\rho \cdot v^2}{2} \]

Where:

Symbol	Description	Units
ΔP	Pressure drop	Pa
f_F	Fanning friction factor	–
L	Pipe length	m
D	Pipe diameter	m
ρ	Fluid density	kg/m³
v	Fluid velocity	m/s

⚙️ Inputs

friction_factor → Fanning friction factor (dimensionless)
length → Pipe length
diameter → Pipe internal diameter
density → Fluid density
velocity → Fluid velocity

📤 Output

Returns a Pressure object containing the pressure drop in Pascals (Pa).

🛠️ Methods

validate_inputs()
Ensures all required inputs (friction_factor, length, diameter, density, velocity) are provided.
Raises ValueError if any are missing.

calculate()
Performs the Fanning pressure drop calculation:

\[ \Delta P = 4 \cdot f_F \cdot \frac{L}{D} \cdot \frac{\rho \cdot v^2}{2} \]

Returns:
Pressure: The computed pressure drop in Pascals.

💻 Example Usage

Using the PressureDropFanning

from processpi.calculations import PressureDropFanning
from processpi.units import Pressure, Length, Diameter, Density, Velocity, Dimensionless

# Define fluid and pipe properties
friction_factor = Dimensionless(0.005)    # Example fanning friction factor
length = Length(50, "m")                  # Pipe length
diameter = Diameter(0.1, "m")             # Pipe diameter
density = Density(998, "kg/m3")           # Water density
velocity = Velocity(2.5, "m/s")           # Flow velocity

# Create calculation instance
pd_calc = PressureDropFanning(
    friction_factor=friction_factor,
    length=length,
    diameter=diameter,
    density=density,
    velocity=velocity
)

# Perform calculation
deltaP = pd_calc.calculate()

print(f"Pressure Drop (Fanning): {deltaP}")

Using the CalculationEngine

from processpi.engine import CalculationEngine
from processpi.units import Pressure, Length, Diameter, Density, Velocity, Dimensionless

# Initialize engine
engine = CalculationEngine()

# Define fluid and pipe properties
friction_factor = Dimensionless(0.005)    # Example fanning friction factor
length = Length(50, "m")                  # Pipe length
diameter = Diameter(0.1, "m")             # Pipe diameter
density = Density(998, "kg/m3")           # Water density
velocity = Velocity(2.5, "m/s")           # Flow velocity

# Perform Fanning pressure drop calculation using the engine
deltaP = engine.calculate(
    "pressure_drop_fanning",
    friction_factor=friction_factor,
    length=length,
    diameter=diameter,
    density=density,
    velocity=velocity
)

print(f"Pressure Drop (via Engine): {deltaP}")

Class: PressureDropFanning