Prandtl probe calculator

flow velocity calculator

online since 2001

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Action
Calculation setup
Pressures
Fluid properties
Flow rates and velocity
Flow is subsonic
Pipe dimensions

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Issues and answers

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issues and answers

Description

pt - total (stagnation) pressure
Measured pressure of the stream when flow velocity is brought to zero isentropically, in the center of the Prandtl probe
pd - 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

Calculation setup

Select value to input. You should enter selected one. The other one will be calculated.
pt
total (stagnation) pressure
pd
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

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