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2. Flow measurement - Wikipedia

   en.wikipedia.org/wiki/Flow_measurement

   Similarly to turbine meters, the paddle wheel meter requires a minimum run of straight pipe before and after the sensor. Flow displays and controllers are used to receive the signal from the paddle wheel meter and convert it into actual flow rate or total flow values.

3. Paddle wheel - Wikipedia

   en.wikipedia.org/wiki/Paddle_wheel

   The paddle wheel is a device for converting between rotary motion of a shaft and linear motion of a fluid. In the linear-to-rotary direction, it is placed in a fluid stream to convert the linear motion of the fluid into rotation of the wheel. Such a rotation can be used as a source of power, or as an indication of the speed of flow.

4. Level sensor - Wikipedia

   en.wikipedia.org/wiki/Level_sensor

   Rotating paddle level sensors are a very old and established technique for bulk solid point level indication. The technique uses a low-speed gear motor that rotates a paddle wheel. When the paddle is stalled by solid materials, the motor is rotated on its shaft by its own torque until a flange mounted on the motor contacts a mechanical switch.

5. Pelton wheel - Wikipedia

   en.wikipedia.org/wiki/Pelton_wheel

   By Newton's second and third laws, the force F imposed by the jet on the runner is equal but opposite to the rate of momentum change of the fluid, so F = −m(V f − V i)/t = −ρQ[(−V i + 2u) − V i] = −ρQ(−2V i + 2u) = 2ρQ(V i − u), where ρ is the density, and Q is the volume rate of flow of fluid.

6. Volumetric flow rate - Wikipedia

   en.wikipedia.org/wiki/Volumetric_flow_rate

   In most contexts a mention of rate of fluid flow is likely to refer to the volumetric rate. In hydrometry, the volumetric flow rate is known as discharge. Volumetric flow rate should not be confused with volumetric flux, as defined by Darcy's law and represented by the symbol q, with units of m 3 /(m 2 ·s), that is, m·s −1. The integration ...

7. Parshall flume - Wikipedia

   en.wikipedia.org/wiki/Parshall_flume

   For a flow calculation, a depth measurement both upstream and downstream is needed. Although commonly thought of as occurring at higher flow rates, submerged flow can exist at any flow level as it is a function of downstream conditions. In natural stream applications, submerged flow is frequently the result of vegetative growth on the ...