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Pressure drop in tube systems

 

Determining the pressure drop is essential for the overall system design and specification of the pumps.
The pressure drop can be determined with measurements within the real system - it often is better to identify the pressure drops in the planning phase.
The calculation of the pressure drops in tube systems is described in the following.
The CONEXA engineering team will be gladly at your service when you encounter any questions.

Used Values:

Pressure drops in the Tube System

Laminar or turbulent flow

The determination of the pressure drop greatly depends on wether the flow is laminar or turbulent. The tube friction factor is calculated with two different formulas, depending on wether a laminar or turbulent flow is present. The tube friction factor is calculated with two different formulas, depending on wether a laminar or turbulent flow is present.

Laminar Flow

 = 

Reduced pressure drop

Turbulent Flow

 = 

Significantly increased
pressure drop due to turbulence

Calculation of the Reynolds' number:

Reynolds' number formula

Reynolds' number Re < 2320
laminar flow

Reynolds' number Re > 2320
turbulent flow

Calculation of tube friction factor λ :

Tube friction factor formula

(for Re < 2320)

Tube friction factor formula

(for Re >= 2320)

The pressure drop inside the tube is specified with the value delta-p while it is computed as follows:

Pressure drop


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