Bernoulli's principle describes the relationship between the flow velocity of a fluid and its pressure. An increase in velocity leads to a drop in pressure in a flowing fluid, and vice versa. The total pressure of the fluid remains constant. Bernoulli's equation is also known as the principle of conservation of energy of the flow. The HM 150.07 experimental unit is used to demonstrate Bernoulli's principle by determining the pressures in a Venturi nozzle. The experimental unit includes a pipe section with a transparent Venturi nozzle and a movable pitot tube for measuring the total pressure. The pitot tube is located within the Venturi nozzle, where it is displaced axially. The position of the pitot tube can be observed through the Venturi nozzle's transparent front panel. The Venturi nozzle is equipped with pressure measuring points to determine the static pressures. The pressures are displayed on the six tube manometers. The total pressure is measured by the pitot tube and displayed on another single tube manometer. The experimental unit is positioned easily and securely on the work surface of the HM 150 base module. The water is supplied and the flow measured by HM 150. Alternatively, the experimental unit can be operated by the laboratory supply.
The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.
Learning Objectives / Experiments
- energy conversion in divergent/convergent pipe flow - recording the pressure curve in a Venturi nozzle - recording the velocity curve in a Venturi nozzle - determining the flow coefficient - recognising friction effects
* Investigation and verification of Bernoulli's
principle1 * Static pressures and total pressure distribution
along the Venturi nozzle1 * Determination of the flow coefficient at different flow
 learning Bernoulli's principle  Venturi nozzle with transparent front panel and measuring points for measuring the static pressures  axially movable pitot tube for determining the total pressure at various points within the Venturi nozzle  6 tube manometers for displaying the static pressures  single tube manometer for displaying the total pressure  flow rate determined by HM 150 base module  water supply using HM 150 base module or via laboratory supply
Venturi nozzle - A: 84...338mm˛ - angle at the inlet: 10,5° - angle at the outlet: 4° Pitot tube - movable range: 0...200mm - diameter: 4mm Pipes and pipe connectors: PVC
Measuring ranges - static pressure: 0...290mmWC - total pressure: 0...370mmWC
Dimensions and Weight
LxWxH: 1.100x675x870mm Weight: approx. 28kg
Required for Operation
HM 150 (closed water circuit) or alternatively water connection and drain
Scope of Delivery
1 experimental unit 1 set of instructional material