Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Entrance Length and Developed Flow

The entrance length is the length in a tube or duct after an obstruction - until the flow velocity profile is fully developed

Sponsored Links

A fluid flow need some length to fully develop the velocity profile after passing through components like bends, valves, pumps, turbines or similar.

Entrance Length

The entrance length can be expressed with the dimensionless Entrance Length Number as

El = le / d                           (1)

where

El = Entrance Length number

le = length to fully developed velocity profile (m, ft)

d = tube or duct diameter (m, ft)

Entrance Length Number for Laminar Flow

The Entrance length number correlates with the Reynolds Number  and for laminar flow the relation can be expressed as:

Ellaminar = 0.06 Re                       (2)

where

Re = Reynolds Number

Entrance Length Number for Turbulent Flow

The Entrance length number correlation with the Reynolds Number for turbulent flow can be expressed as:

Elturbulent = 4.4 Re1/6                         (3)

Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: entrance length developed flow velocity profile tube duct obstruction
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!
.

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

1 19

Sponsored Links