Friction Factor Calculator

Enter the fluid velocity, pipe diameter, and kinematic viscosity into the calculate to determine the friction factor.

Friction Factor Formula

The following formula is used to calculate the friction factor in laminar flow.

f = 64 / RE = 64 / (V*D/v)

  • Where f is the friction factor
  • V is the fluid velocity (m/s)
  • D is the diameter of the pipe (m)
  • v is the kinematic viscosity (m^2/s)

In the case of this formula, it can also be written as 64 / RE, where RE is the Reynold’s number = V*D/v

FAQ

What is a friction factor?

A friction factor is a unitless measure of friction of a fluid moving through a pipe. It’s often used to help calculate energy loss as fluid moves through an opening.

What is Reynolds number?

The Reynolds number is a number , similar to a friction factor, that is a measure of the resistance to flow due to internal resistance as a fluid moves through a pipe.

Example

The following is an example of calculating a friction factor.

  1. First, determine the velocity of the fluid. Measure the velocity of the fluid or calculate it. For this example we will assume a velocity of 25 m/s.
  2. Next, determine the diameter of the pipe. The pipe in this problem is said to be 25m in diameter.
  3. Next, determine the kinematic viscosity. Through empirical data or through published data on the fluid, we find the kinematic viscosity to be 10 m^2/s.
  4. Finally, calculate the friction factor using the formula. f = 64/(25*25/10) = 1.024.
friction factor calculator

Related Terms

friction factor calculator
friction factor formula
how to calculate friction factor
colebrook equation
how to calculate friction
colebrook white equation
friction factor equation
darcy friction factor formulae
friction factor formula for turbulent flow
colebrook white formula
colebrook formula
darcy friction factor equation
how to calculate friction loss
how to find the friction coefficient
formula colebrook white
how do you calculate friction
friction factor equation for turbulent flow
friction factor for turbulent flow formula
colebrook and white equation
how to calculate head loss due to friction
formula of friction factor
how to calculate friction on a slope
how to find friction without coefficient
pipe friction factor equation
how to use colebrook equation
how to find the friction