SQ_EDGE_SCREEN

Overview

Calculate the loss coefficient for a square edged wire screen, bar screen, or perforated plate.

Excel Usage

=SQ_EDGE_SCREEN(alpha)

• alpha (float, required): Fraction of screen open to flow, [-]

Returns (float): Loss coefficient K, [-], or error message (str) if input is invalid.

Examples

Example 1: High open area (alpha=0.99)

Inputs:

alpha
0.99

Excel formula:

=SQ_EDGE_SCREEN(0.99)

Expected output:

Result
0.008

Example 2: Medium open area (alpha=0.5)

Inputs:

alpha
0.5

Excel formula:

=SQ_EDGE_SCREEN(0.5)

Expected output:

Result
3.8

Example 3: Low open area (alpha=0.2)

Inputs:

alpha
0.2

Excel formula:

=SQ_EDGE_SCREEN(0.2)

Expected output:

Result
52

Example 4: Typical screen (alpha=0.7)

Inputs:

alpha
0.7

Excel formula:

=SQ_EDGE_SCREEN(0.7)

Expected output:

Result
1.1

Python Code

import micropip
await micropip.install(["fluids"])
from fluids.filters import square_edge_screen as fluids_square_edge_screen

def sq_edge_screen(alpha):
    """
    Calculate the loss coefficient for a square edged wire screen, bar screen, or perforated plate.

    See: https://fluids.readthedocs.io/fluids.filters.html#fluids.filters.square_edge_screen

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

    Args:
        alpha (float): Fraction of screen open to flow, [-]

    Returns:
        float: Loss coefficient K, [-], or error message (str) if input is invalid.
    """
    # Validate and convert alpha
    try:
        alpha = float(alpha)
    except (ValueError, TypeError):
        return "Error: Alpha must be a number."

    # Validate alpha range
    if alpha <= 0 or alpha > 1:
        return "Error: Alpha must be between 0 and 1."

    try:
        result = fluids_square_edge_screen(alpha=alpha)
        # Handle NaN and infinity
        if result != result:  # NaN check
            return "nan"
        if result == float('inf'):
            return "inf"
        if result == float('-inf'):
            return "-inf"
        return float(result)
    except Exception as e:
        return f"Error computing square_edge_screen: {str(e)}"

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