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Calculator Description

# Pipe Flow (single phase Gas or Liquid)

## Subject

Fluid flow in a pipe varies across its diameter and along its length dependent upon the properties of the fluid, the pipe and the nature of the flow (laminar or turbulent).

Liquids are [theoretically] incompressible so the inlet and outlet velocities and flow-rates must be [almost] identical. Differences occur in head and pressure, which are generated by friction in the liquid and between it and the pipe.
Inlet pressure and head are always greater than outlet pressure and head, i.e. there will be a positive pressure drop over the length of the pipe.

Gases are compressible so whilst mass flow rates and velocities must be [almost] identical, volumetric and linear velocities will vary with viscosity. There will be a positive pressure drop over the length of the pipe.

## Calculator

The pipe flow calculator determines the properties of a fluid flowing through a circular enclosed pipe of a specified length at any point across its diameter according to classical theory.

The instantaneous velocity of a fluid varies across the diameter of the pipe with volumetric flow rate and pipe surface quality. Pipe Flow applies the fanning friction factor to the fluid velocity.

For help using this calculator see Technical Help

## Pipe Flow Calculator - Options

Liquid

This calculation option is for a flowing liquid, the conditions for which are similar at the inlet and the outlet ends of the pipe as liquids are assumed to be incompressible.

You enter and the pipe flow calculator will provide:
• Liquid density
• Liquid dynamic viscosity
• Liquid temperature
• Volume flow rate
• Pipe diameter
• Pipe length
• Pipe inlet head
• Pipe outlet height
• Surface roughness
• Radius of locality (r)
• Gravitational acceleration
• Liquid specific weight
• Local velocity (@ r)
• Average velocity
• Maximum velocity
• Radius @ ave. velocity
• Mass velocity
• Mass flow rate
• Reynolds No.
• Fanning friction factor
• Pressure coefficient
• Pipe outlet head
• Pressure drop
• Total loss

Gas

This calculation option is for a flowing gas, the conditions for which are different at the inlet and the outlet ends of the pipe as gases are compressible.

You enter: and the pipe flow calculator will provide:
• Gas density
• Dynamic viscosity
• Gas temperature
• Relative atomic mass
• Pipe diameter
• Pipe length
• Inlet pressure
• Outlet pressure
• Surface roughness
• Radius of locality (r)
• Gravitational acceleration
• Average inlet density
• Local inlet velocity (@ r)
• Average inlet density
• Maximum inlet velocity
• Average inlet velocity
• Maximum inlet velocity
• Average outlet density
• Local outlet velocity (@ r)
• Average outlet velocity
• Maximum outlet velocity
• Radius @ average velocities
• Mass velocity
• Quantity flow rate
• Reynolds No.
• Fanning friction factor
• Pressure coefficient

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