If we are familiar with the principle of mass continuity (velocity should increase) and the conservation of mechanical energy (pressure should decrease), the phenomena is straightforward.īut why are we investigating only subsonic flow? The question leads us to the consideration of the sound-speed barrier, where the presence of the shockwave prevents any further increase in volume flow rate via the increase of the upstream pressure. However, the change in density and the presence of friction affects the phenomena. This behavior is observed in case of viscous and weakly compressible flows. The above equation shows that, in the event of a pressure drop, the velocity increases and vice versa. Where p is pressure, is the fluid density and v is velocity. The ideal, inviscid, incompressible form of the Bernoulli equation describes the relationship between velocity and pressure: When a fluid (gas or liquid) in the subsonic regime is forced through a pipe that has a smaller cross-section, the static pressure decreases. Fluid Mechanics Industry Application Wind Engineering Basic Fluid Dynamics How Does the Venturi Effect Work?
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