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  2. Darcy–Weisbach equation - Wikipedia

    en.wikipedia.org/wiki/Darcy–Weisbach_equation

    Darcy–Weisbach equation calculator; Pipe pressure drop calculator Archived 2019-07-13 at the Wayback Machine for single phase flows. Pipe pressure drop calculator for two phase flows. Archived 2019-07-13 at the Wayback Machine; Open source pipe pressure drop calculator. Web application with pressure drop calculations for pipes and ducts

  3. Static pressure - Wikipedia

    en.wikipedia.org/wiki/Static_pressure

    At least one author takes a different approach in order to avoid a need for the expression freestream static pressure. Gracey has written "The static pressure is the atmospheric pressure at the flight level of the aircraft". [15] [16] Gracey then refers to the air pressure at any point close to the aircraft as the local static pressure.

  4. Diffuser (thermodynamics) - Wikipedia

    en.wikipedia.org/wiki/Diffuser_(thermodynamics)

    A diffuser is "a device for reducing the velocity and increasing the static pressure of a fluid passing through a system”. [1] The fluid's static pressure rise as it passes through a duct is commonly referred to as pressure recovery. In contrast, a nozzle is used to increase the discharge velocity and lower the pressure of a fluid passing ...

  5. Pressure head - Wikipedia

    en.wikipedia.org/wiki/Pressure_head

    This is why static pressure and dynamic pressure are never the same in a system in which the fluid is in motion. This pressure difference arises from a change in fluid velocity that produces velocity head, which is a term of the Bernoulli equation that is zero when there is no bulk motion of the fluid. In the picture on the right, the pressure ...

  6. Choked flow - Wikipedia

    en.wikipedia.org/wiki/Choked_flow

    For air with a heat capacity ratio =, then =; other gases have in the range 1.09 (e.g. butane) to 1.67 (monatomic gases), so the critical pressure ratio varies in the range < / <, which means that, depending on the gas, choked flow usually occurs when the downstream static pressure drops to below 0.487 to 0.587 times the absolute pressure in ...

  7. Duct (industrial exhaust) - Wikipedia

    en.wikipedia.org/wiki/Duct_(industrial_exhaust)

    Sizing of the ductwork; Calculation of resistance; Finalizing the capacity of blower, etc. [4] The goal is to keep contaminants out using minimum airflow. It is estimated that increase in an inch wg [clarification needed] of static pressure can add a few thousands of dollars to the operation cost per annum.

  8. Axial fan design - Wikipedia

    en.wikipedia.org/wiki/Axial_fan_design

    Pressure will be atmospheric at both −∞ and +∞ Density will be equal at both −∞ and +∞ Velocity will change due to flow across an assumed converging duct Stagnation enthalpy will be different at −∞ and +∞ The static Enthalpy will be same at −∞ and +∞ as it depends upon the atmospheric conditions that will be the same

  9. Rayleigh flow - Wikipedia

    en.wikipedia.org/wiki/Rayleigh_flow

    For this model, the duct area remains constant and no mass is added within the duct. Therefore, unlike Fanno flow , the stagnation temperature is a variable. The heat addition causes a decrease in stagnation pressure , which is known as the Rayleigh effect and is critical in the design of combustion systems.

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