Pressure and velocity measurement devices

Pressure andVelocityMeasurementDevicesFLUID MECHANICSNAME: SECTION:2130401IntroductionMany techniques have been developed for the measurement ofpressure and vacuum. Instruments used to measure pressure arecalled pressure gauges or vacuum gauge, also the flow rate of a fluidflowing in a pipe under pressure is measured for a variety ofapplications, such as monitoring of pipe flow rate and control ofindustrial processes.Differential pressure flow meters, consisting of orifice, flow nozzle, andventuri meters, are widely used for pipe flow measurement.2Pressure Measurement Devices1-PiezometerThe simplest manometer is a tube, open at the top, which isattached to the top of a vessel or pipe containing liquid at a pressure(higher than atmospheric) to be measured.As the tube is open to the atmosphere the pressure measured isrelative to atmospheric so is gauge pressure.Pressure at A = pressure due to column of liquid h1 = Pressure at B = pressure due to column of liquid h2 = Problems with the Piezometer:1. It cannot measure suction pressure which is lowerthan the atmospheric pressure.2. The pressure measured is limited by availablecolumn height.3. It can only deal with liquids, not gases.Figure 1: Piezometer2-Mercury BarometerMercury Barometer (Fig.2) is the simplest device to measureatmospheric pressure at a location. It consists of a gl ...


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