**venturi speed to find in the throat section** Water at 10ºC is pumped in a pipe and a Venturi is used to measure the flowrate. The fluid velocity is slowly increased and, suddenly, bubbles appear at the throat along with an unpleasant sound. Meter A then indicates 120 kPa (P1 in the large section of the venturi) Density of water: 1000 kg/m3 Viscosity of water: 1 mPa s Vapor pressure of water at 10ºC: 1.23 kPa a) What is the cause of this phenomenon? b) What is the speed of water upstream from the Venturi (meter A)? Suppose that the Venturi coefficient is 0.9. what is the formula for velocity for the upstream side, involving only the pressure P1 = 120 kpa (is not the differential pressure) ? thank you |