DBUNDLE_NT_PHADK

This function computes the tube bundle diameter required to fit a specified number of tubes using the Phadke method, accounting for pitch, tube diameter, pass count, and layout angle. It is a reverse sizing operation of tube-count calculations.

The solver finds D_{bundle} such that N_{tubes}(D_{bundle}, D_o, p, N_{tp}, \theta) = N_{target}.

Excel Usage

=DBUNDLE_NT_PHADK(Ntubes, Do, pitch, Ntp, angle)
  • Ntubes (int, required): Total number of tubes (-).
  • 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 (float): Outer diameter of tube bundle (m).

Example 1: Phadkeb bundle diameter example

Inputs:

Ntubes Do pitch Ntp angle
782 0.028 0.036 2 45

Excel formula:

=DBUNDLE_NT_PHADK(782, 0.028, 0.036, 2, 45)

Expected output:

1.18794

Example 2: Phadkeb estimate for smaller bundle

Inputs:

Ntubes Do pitch Ntp angle
300 0.01905 0.025 1 30

Excel formula:

=DBUNDLE_NT_PHADK(300, 0.01905, 0.025, 1, 30)

Expected output:

0.46905

Example 3: Phadkeb estimate with four passes

Inputs:

Ntubes Do pitch Ntp angle
900 0.025 0.03125 4 30

Excel formula:

=DBUNDLE_NT_PHADK(900, 0.025, 0.03125, 4, 30)

Expected output:

1.05767

Example 4: Phadkeb estimate with 90 degree layout

Inputs:

Ntubes Do pitch Ntp angle
600 0.022 0.028 2 90

Excel formula:

=DBUNDLE_NT_PHADK(600, 0.022, 0.028, 2, 90)

Expected output:

0.81396

Python Code

Show Code 
from ht.hx import DBundle_for_Ntubes_Phadkeb as hx_DBundle_for_Ntubes_Phadkeb

def DBundle_Nt_Phadk(Ntubes, Do, pitch, Ntp, angle=30):
    """
    Calculate tube bundle diameter for a given tube count 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:
        Ntubes (int): Total number of tubes (-).
        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:
        float: Outer diameter of tube bundle (m).
    """
    try:
        result = hx_DBundle_for_Ntubes_Phadkeb(Ntubes=Ntubes, Do=Do, pitch=pitch, Ntp=Ntp, angle=angle)
        return result
    except Exception as e:
        return f"Error: {str(e)}"

Online Calculator

Total number of tubes (-).
Tube outer diameter (m).
Tube pitch (m).
Number of tube passes (-).
Tube layout angle (degrees).