Pressure Variation in a Moving Fluid


The flow through the venturi tube can be used to induce the flow of a second fluid. e.g.: In carburetor, the primary airflow draws gasoline into the engine. As the air moves through the throat (the region of reduced cross-sectional area), its velocity increases and its pressure decreases. The drop in pressure provides suction, which draws gasoline into the throat and out through the exit of the venturi.