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Calculation setup

Pressures

Flow rates and velocity

Flow is subsonic

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- p
_{t}- total (stagnation) pressure - Measured pressure of the stream when flow velocity is brought to zero isentropically, in the center of the Prandtl probe
- p
_{d}- dynamic pressure - Differential pressure calculated as the difference between the total (stagnation) and the static pressure.
- p - static pressure
- Measured pressure of the flow without the affect of the fluid movement (kinetic) energy
- ρ - fluid density
- Mass per unit of volume
- R - gas constant
- Gas constant in terms of energy per unit of mass and temperature, for gas density calculation using ideal gas state equation
- κ - isentropic coefficient
- Specific heat ratio
- T - temperature
- Fluid temperature for gas density calculation based on the ideal gas state equation
- q - volumetric flow rate
- Fluid flow rate in terms of units of volume per unit of time
- ṁ - mass flow rate
- Fluid flow rate in terms of units of mass per unit of time
- V - velocity
- Flow velocity in terms of units of distance per unit of time
- c - speed of sound
- Sound speed for given gas and actual conditions in terms of pressure, density and temperature
- M - Mach number
- Flow velocity and actual speed of the sound ratio
- D - internal diameter
- Internal circular pipe diameter
- A - area
- Internal pipe cross section area
- h - channel height
- Height of the channel for rectangled closed pipe line
- w - channel width
- Width of the channel for rectangled closed pipe line

- Select value to input. You should enter selected one. The other one will be calculated.
- p
_{t} - total (stagnation) pressure
- p
_{d} - dynamic pressure

- Select value to input. You should enter selected one. The other one will be calculated.
- ρ
- fluid density
- T
- temperature

- Select pipe shape
- round pipe
- full cross section fluid flow
- rectangle pipe
- for rectangle channels and full cross section flow