Dynamic pressure
1
Dynamic Pressure Dynamic pressure is the component of fluid pressure that represents a fluids kinetic energy The dynamic pressure is a defined property of a moving flow of gas or liquid and can be expressed as pd = 1/2 ρ v 2 (1) where pd = dynamic pressure (Pa) ρ = density of fluid (kg/m 3 ) v = velocity (m/s) Some common densities: • Water at 0 o C - 1000 kg/m 3 • Water at 32 o F - 62.4 lbm/ft 3 • Air at 20 o C - 1.2 kg/m 3 • Air at 59 o F - 0.0765 lbm/ft 3 Example - Dynamic Viscosity in a Water Flow The dynamic pressure of water at 20 o C, 1000 kg/m 3 , flowing with velocity 5 m/s, can be calculated using (1) like pd = 1/2 1000 kg/m 3 (5 m/s) 2 = 12.5 kPa
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Transcript of Dynamic pressure
Dynamic Pressure
Dynamic pressure is the component of fluid pressure that represents a fluids kinetic energy
The dynamic pressure is a defined property of a moving flow of gas or liquid and can be expressed as
pd = 1/2 ρ v2 (1)
where
pd = dynamic pressure (Pa)
ρ = density of fluid (kg/m3)
v = velocity (m/s)
Some common densities:
• Water at 0oC - 1000 kg/m3 • Water at 32oF - 62.4 lbm/ft3 • Air at 20oC - 1.2 kg/m3 • Air at 59oF - 0.0765 lbm/ft3
Example - Dynamic Viscosity in a Water Flow
The dynamic pressure of water at 20oC, 1000 kg/m3, flowing with velocity 5 m/s, can be calculated using (1) like
pd = 1/2 1000 kg/m3 (5 m/s)2
= 12.5 kPa
