REYNOLDS
Excel Usage
=REYNOLDS(V, D, rho, mu, nu)V(float, required): Velocity [m/s]D(float, required): Diameter [m]rho(float, optional, default: null): Density [kg/m^3]mu(float, optional, default: null): Dynamic viscosity [Pa*s]nu(float, optional, default: null): Kinematic viscosity [m^2/s]
Returns (float): Reynolds number [-]
Examples
Example 1: Reynolds number with density and dynamic viscosity
Inputs:
| V | D | rho | mu |
|---|---|---|---|
| 2.5 | 0.25 | 1.1613 | 0.000019 |
Excel formula:
=REYNOLDS(2.5, 0.25, 1.1613, 0.000019)Expected output:
38200.65789
Example 2: Reynolds number with kinematic viscosity
Inputs:
| V | D | nu |
|---|---|---|
| 2.5 | 0.25 | 0.00001636 |
Excel formula:
=REYNOLDS(2.5, 0.25, 0.00001636)Expected output:
38202.93399
Example 3: Reynolds number with higher velocity
Inputs:
| V | D | rho | mu |
|---|---|---|---|
| 5 | 0.5 | 1000 | 0.001 |
Excel formula:
=REYNOLDS(5, 0.5, 1000, 0.001)Expected output:
2500000
Example 4: Reynolds number for water flow
Inputs:
| V | D | nu |
|---|---|---|
| 1 | 0.1 | 0.000001 |
Excel formula:
=REYNOLDS(1, 0.1, 0.000001)Expected output:
100000
Python Code
from fluids.core import Reynolds as fluids_Reynolds
def reynolds(V, D, rho=None, mu=None, nu=None):
"""
Calculate the Reynolds number.
See: https://fluids.readthedocs.io/fluids.core.html#fluids.core.Reynolds
This example function is provided as-is without any representation of accuracy.
Args:
V (float): Velocity [m/s]
D (float): Diameter [m]
rho (float, optional): Density [kg/m^3] Default is None.
mu (float, optional): Dynamic viscosity [Pa*s] Default is None.
nu (float, optional): Kinematic viscosity [m^2/s] Default is None.
Returns:
float: Reynolds number [-]
"""
try:
if V is None or D is None:
return "Error: V and D are required parameters"
V_val = float(V)
D_val = float(D)
# Check that at least one valid parameter set is provided
if rho is not None and mu is not None:
rho_val = float(rho)
mu_val = float(mu)
return float(fluids_Reynolds(V=V_val, D=D_val, rho=rho_val, mu=mu_val))
if nu is not None:
nu_val = float(nu)
return float(fluids_Reynolds(V=V_val, D=D_val, nu=nu_val))
return "Error: Either (rho and mu) or nu must be provided"
except Exception as e:
return f"Error: {str(e)}"