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Dynamic pressure is the kinetic energy of a flowing fluid - liquid or gas - per unit volume - and can be expressed as. p d = 1/2 ρ v2(1) where. p d = dynamic pressure (N/m2(Pa), lbf /ft2(psf)) ρ = density of fluid (kg/m3, slugs /ft3 ) v = velocity (m/s, ft/s)
Purpose and Learning Objectives. The purpose of this presentation is to provide industry professionals with an overview of the basic concepts and relationships between airflow and pressure, and how these concepts are affected by various outside factors in regard to fans.
Bernoulli's principle. A flow of air through a venturi meter. The kinetic energy increases at the expense of the fluid pressure, as shown by the difference in height of the two columns of water. Video of a venturi meter used in a lab experiment. Part of a series on.
Flow Rate and Continuity. A flowing fluid at equilibrium is an example of a steady-state system. If you are observing a steady-state fluid system flowing past you, the system looks identical with passage of time.
Define density and its related SI units; Compare and contrast the densities of various substances; Define pressure and its related SI units; Explain the relationship between pressure and force; Calculate force given pressure and area
Units of pressure. As stated earlier, the SI unit for pressure is the pascal (Pa), where \[1\; Pa = 1\; N/m^{2} \ldotp\] In addition to the pascal, many other units for pressure are in common use (Table \(\PageIndex{1}\)). In meteorology, atmospheric pressure is often described in the unit of millibars (mb), where
Pressure and pressure gradient. In fluid statics, as well as in fluid dynamics, the forces acting on a portion of fluid (CV) bounded by a CS are of two kinds: body forces and surface forces. Body Forces: act on the entire body of the fluid (force per unit volume).
