Enter the length to fully develop the velocity profile (ft) and the tube diameter (ft) into the Calculator. The calculator will evaluate the Entrance Length. 

Entrance Length Formula

EL = Ie / d

Variables:

  • EL is the Entrance Length (ft/ft)
  • Ie is the length to fully develop velocity profile (ft)
  • d is the tube diameter (ft)

To calculate the Entrance Length, divide the length to fully develop the velocity profile by the tube diameter.

How to Calculate Entrance Length?

The following steps outline how to calculate the Entrance Length.

  1. First, determine the length to fully develop velocity profile (ft). 
  2. Next, determine the tube diameter (ft). 
  3. Next, gather the formula from above = EL = Ie / d.
  4. Finally, calculate the Entrance Length.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

length to fully develop velocity profile (ft) = 6.5

tube diameter (ft) = 0.45