1. What is Friction Factor for Laminar Flow?

The Friction Factor for Laminar Flow is a dimensionless number that quantifies the resistance to flow in a duct or pipe under laminar flow conditions. It depends on the Reynolds number and the surface characteristics of the duct.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( f_{laminar} \) — Friction Factor for Laminar Flow (dimensionless)
• \( Re \) — Reynolds Number (dimensionless)

Explanation: This formula provides the friction factor for fully developed laminar flow in circular pipes, where the flow is smooth and orderly.

3. Importance of Friction Factor Calculation

Details: Calculating the friction factor is essential for determining pressure drops, flow rates, and energy losses in fluid systems, particularly in piping and ductwork design.

4. Using the Calculator

Tips: Enter the Reynolds number (must be greater than 0). The calculator will compute the friction factor for laminar flow conditions.

5. Frequently Asked Questions (FAQ)

Q1: What is the range of Reynolds number for laminar flow?
A: For flow in circular pipes, laminar flow typically occurs when Re < 2300.

Q2: Is this formula applicable to non-circular ducts?
A: The formula f = 64/Re is specifically for circular pipes. For non-circular ducts, equivalent diameter concepts and different correlations may be needed.

Q3: How does surface roughness affect laminar flow friction?
A: In laminar flow, the friction factor is independent of surface roughness and depends only on the Reynolds number.

Q4: What are typical values of friction factor in laminar flow?
A: For Re = 1000, f = 0.064; for Re = 2000, f = 0.032. The friction factor decreases as Reynolds number increases.

Q5: When should I use this formula versus turbulent flow formulas?
A: Use this formula only when the flow is confirmed to be laminar (Re < 2300 for circular pipes). For turbulent flow, use appropriate correlations like Colebrook-White equation.