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If the water flow velocity is below the rising velocity of air bubbles, then water trickles down to the low point Lo2 and traps the remaining air between Hi1 and Lo2. As more water flows down, the upward leg Lo2 to Hi2 fills up. This exerts a pressure on the trapped air of either H2 m of water (WG = water gauge) or H1, whichever is less. If H2 ...
Reinhard Woltman (sometimes spelled Woltmann (December 28, 1757 – April 20, 1837) was a German hydraulic engineer best known for the invention of the Woltman turbine-based flow measurement device. Woltman was born in Axstedt to Johann and his wife, Adelheit née Jacobsen.
Civil engineering projects that use air pressure to keep water and mud out of the workplace use an airlock to transfer personnel, equipment, and materials between the external normabaric environment and the pressurized workplace in a caisson or sealed tunnel. The airlock may need to be large enough to accommodate a whole working shift at the ...
Many types of meters also register air flows, which can lead to over-registration of consumption, [27] especially in systems with intermittent supply, when water supply is re-established and the incoming water pushes air through the meters. Displacement Water meters do not distinguish between air and water, both are counted as fluid.
Positive-displacement (PD) meters can measure both liquids and gases. Like turbine meters, PD flow meters work best with clean, non-corrosive, and non-erosive liquids and gases, although some models will tolerate some impurities. Because of their high accuracy, PD meters are widely used at residences to measure the amount of gas or water used.
Cross-flow turbine: Also known as Banki-Mitchell or Ossberger turbines, these devices are used for a large range of hydraulic heads (from 2 to 100 meters) and flow rates (from 0.03 to 20 m 3 /s), but are more efficient for low heads and low power outputs. They are considered "impulse" turbines, since they get energy from water by reducing its ...
An air flow meter is a device similar to an anemometer that measures air flow, i.e. how much air is flowing through a tube. It does not measure the volume of the air passing through the tube, it measures the mass of air flowing through the device per unit time, though Thus air flow meters are simply an application of mass flow meters for the ...
Air flow meter; Ammeter; Automatic meter reading; C. Cyclonic flow meter; D. ... Water metering This page was last edited on 7 January 2018, at 21:41 (UTC). ...
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