The pressure through the nozzle can be controlled by a ball valve located on the discharge side of the nozzle. The Inlet, Throat and Outlet pressures are displayed on a pressure gauge via a three-way selector switch. Cavitation demonstration apparatus is a bench top unit designed for use on Hydraulics Bench. It consists of a tube through which water can be pumped by the hydraulic bench. The apparatus comprises of a clear acrylic nozzle mounted on a support plate. The throat pressure can be varied in either of two ways. The first way is to vary the discharge. Reduction of discharge causes a corresponding reduction of the pressure drop as the flow accelerates into the throat because the velocities are reduced, so that the pressure in the throat increases and cavitation ceases. The tube has an initial diameter of 25mm. It then has a linear contraction to a throat diameter of 5mm. This is followed by a 10mm length of parallel-sided tube, after which it flows through a linear diffuser until the diameter is back to 25mm. The contraction ratio (measured in terms of cross-section area) is therefore 25:1. The second way is to throttle the flow out of the apparatus using the ball valve. From a situation where there is no cavitation, increasing the discharge increases the pressure drop as the flow accelerates into the throat because the velocities are increased.
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Operating Conditions:
Operating environment:Laboratory
Operating relative humidity range: 80% at temperatures < 31C decreasing linearly to 50% at 40C
Operating temperature range:+5C to +40C
Storage temperature range:25C to +55C (when packed for transport).
Cavitation Demonstration is a small scale apparatus designed to demonstrate Cavitation utilizing an Hydraulics Bench
Flow control valves upstream and downstream of the test section allow flow conditions to be optimised for the demonstration of Cavitation
The apparatus consists of a circular Venturi shaped section manufactured from clear acrylic
Three Bourdon gauges indicate the static pressure upstream of the contraction, inside the throat and downstream of the expansion
Educational software available as an option
Quick release fitting for easy connection to hydraulics bench.
