Confused on static vs. dynamic pressure
Confused on static vs. dynamic pressure
(OP)
Hello everyone,
I am a new chemical engineering grad and trying to work my way through some of my first line sizing calculations.
I was hoping someone could clarify for me the difference between dynamic and static pressure, and how the two are calculated.
Also, how is the static pressure of a gas calculated? For instance, if natural gas is being drawn from a pipeline at 4400 kPa, 0 deg C, 4000 kg/hr from ground level, how do I calculate the static pressure for that?
I am a new chemical engineering grad and trying to work my way through some of my first line sizing calculations.
I was hoping someone could clarify for me the difference between dynamic and static pressure, and how the two are calculated.
Also, how is the static pressure of a gas calculated? For instance, if natural gas is being drawn from a pipeline at 4400 kPa, 0 deg C, 4000 kg/hr from ground level, how do I calculate the static pressure for that?





RE: Confused on static vs. dynamic pressure
RE: Confused on static vs. dynamic pressure
Dynamic Pressure: Rho.V^2/2 (Calculate the velocity of gas by 4000 kg/hr/3600/(Rho.A), which A is cross section area of thr\e pipe).
Hope this help
RE: Confused on static vs. dynamic pressure
RE: Confused on static vs. dynamic pressure
the effect of elevation change is minimal for most gases,but not for liquids and total head is important.
Get a copy of Perry's C.E. HB they have a great section on this.
RE: Confused on static vs. dynamic pressure
The pitot tube is bent into the direction from which the fluid is flowing (or into which the air plane is flying). It measures the dynamic pressure plus the static pressure at the altitude at which the plane is flying. The alti-meter measures the static pressure at a point which is not affected by the speed of the plane. The difference between the two readings is the dynamic pressure and the air speed of the plane can be calculated from this.
With anubars, through the holes facing the flow, the dynamic plus static pressure can be measured. Through the holes on the opposite side, the static pressure is measured. The difference is the dynamic pressure and the flow can be calculated once again from this difference.