SURATMAN

Excel Usage

=SURATMAN(L, rho, mu, sigma)

• L (float, required): Characteristic length [m]
• rho (float, required): Density of fluid [kg/m^3]
• mu (float, required): Viscosity of fluid [Pa*s]
• sigma (float, required): Surface tension [N/m]

Returns (float): Suratman number [-]

Examples

Example 1: Simple example

Inputs:

L	rho	mu	sigma
0.0001	1000	0.001	0.1

Excel formula:

=SURATMAN(0.0001, 1000, 0.001, 0.1)

Expected output:

10000

Example 2: Larger characteristic length

Inputs:

L	rho	mu	sigma
0.001	1000	0.001	0.1

Excel formula:

=SURATMAN(0.001, 1000, 0.001, 0.1)

Expected output:

100000

Example 3: Lower viscosity fluid

Inputs:

L	rho	mu	sigma
0.0001	1000	0.0001	0.1

Excel formula:

=SURATMAN(0.0001, 1000, 0.0001, 0.1)

Expected output:

1000000

Example 4: High surface tension

Inputs:

L	rho	mu	sigma
0.0001	1000	0.001	0.5

Excel formula:

=SURATMAN(0.0001, 1000, 0.001, 0.5)

Expected output:

50000

Python Code

from fluids.core import Suratman as fluids_Suratman

def suratman(L, rho, mu, sigma):
    """
    Calculate the Suratman number.

    See: https://fluids.readthedocs.io/fluids.core.html#fluids.core.Suratman

    This example function is provided as-is without any representation of accuracy.

    Args:
        L (float): Characteristic length [m]
        rho (float): Density of fluid [kg/m^3]
        mu (float): Viscosity of fluid [Pa*s]
        sigma (float): Surface tension [N/m]

    Returns:
        float: Suratman number [-]
    """
    try:
      L_val = float(L)
      rho_val = float(rho)
      mu_val = float(mu)
      sigma_val = float(sigma)

      if mu_val == 0:
        return "Error: Viscosity must be non-zero"

      result = fluids_Suratman(L_val, rho_val, mu_val, sigma_val)
      return float(result)
    except Exception as e:
      return f"Error: {str(e)}"

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