The venturi nozzle is installed in the water circuit of the HM 500 trainer. The flow rate measurement is based on the differential pressure method.
A constriction of the nozzle cross-section causes an increase in velocity which results in a measurable decrease in pressure. Taking account of the geometry of the nozzle, the flow rate can be calculated from the decrease in pressure using Bernoulli’s principle and the Continuity law.
The necessary connections are provided to measure and display the pressure loss using the HM 500. The transparent front makes the cross-sectional characteristic of the venturi nozzle visible, thus aiding understanding of the principle of operation.