NTUBES_PHADKEB

This function computes tube count for a shell-and-tube bundle using Phadke’s method with pass correction behavior, pitch, tube size, and layout angle. It is a high-accuracy option for tube-count determination.

The method evaluates N = f(D_{bundle}, D_o, p, N_{tp}, \theta) and returns an integer count.

Excel Usage

=NTUBES_PHADKEB(DBundle, Do, pitch, Ntp, angle)
  • DBundle (float, required): Outer diameter of tube bundle (m).
  • Do (float, required): Tube outer diameter (m).
  • pitch (float, required): Tube pitch (m).
  • Ntp (int, required): Number of tube passes (-).
  • angle (int, optional, default: 30): Tube layout angle (degrees).

Returns (int): Total number of tubes that fit in the bundle (-).

Example 1: Phadkeb tube count example

Inputs:

DBundle Do pitch Ntp angle
1.184 0.028 0.036 2 45

Excel formula:

=NTUBES_PHADKEB(1.184, 0.028, 0.036, 2, 45)

Expected output:

782

Example 2: Phadkeb tube count with single pass

Inputs:

DBundle Do pitch Ntp angle
1.008 0.028 0.036 1 45

Excel formula:

=NTUBES_PHADKEB(1.008, 0.028, 0.036, 1, 45)

Expected output:

593

Example 3: Phadkeb tube count with four passes

Inputs:

DBundle Do pitch Ntp angle
1.2 0.025 0.03125 4 30

Excel formula:

=NTUBES_PHADKEB(1.2, 0.025, 0.03125, 4, 30)

Expected output:

1184

Example 4: Phadkeb tube count for smaller bundle

Inputs:

DBundle Do pitch Ntp angle
0.8 0.01905 0.025 2 30

Excel formula:

=NTUBES_PHADKEB(0.8, 0.01905, 0.025, 2, 30)

Expected output:

846

Python Code

Show Code 
from ht.hx import Ntubes_Phadkeb as hx_Ntubes_Phadkeb

def Ntubes_Phadkeb(DBundle, Do, pitch, Ntp, angle=30):
    """
    Calculate tube count from bundle diameter using Phadke's method.

    See: https://ht.readthedocs.io/en/latest/ht.hx.html

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

    Args:
        DBundle (float): Outer diameter of tube bundle (m).
        Do (float): Tube outer diameter (m).
        pitch (float): Tube pitch (m).
        Ntp (int): Number of tube passes (-).
        angle (int, optional): Tube layout angle (degrees). Default is 30.

    Returns:
        int: Total number of tubes that fit in the bundle (-).
    """
    try:
        result = hx_Ntubes_Phadkeb(DBundle=DBundle, Do=Do, pitch=pitch, Ntp=Ntp, angle=angle)
        return int(result)
    except Exception as e:
        return f"Error: {str(e)}"

Online Calculator

Outer diameter of tube bundle (m).
Tube outer diameter (m).
Tube pitch (m).
Number of tube passes (-).
Tube layout angle (degrees).