Description

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

Calculation setup

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

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