Chapt06

10 fluid meters 2549 lbfft2 12 238 fts 194 slugsft3

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Unformatted text preview: ful. Six other widely used meters operate on different physical principles: | v v 1. 2. 3. 4. 5. 6. | Turbine meter Vortex meter Ultrasonic flowmeter Rotameter Coriolis mass flowmeter Laminar flow element e-Text Main Menu | Textbook Table of Contents | Study Guide 392 Chapter 6 Viscous Flow in Ducts Turbine meter. The turbine meter, sometimes called a propeller meter, is a freely rotating propeller which can be installed in a pipeline. A typical design is shown in Fig. 6.31a. There are flow straighteners upstream of the rotor, and the rotation is measured by electric or magnetic pickup of pulses caused by passage of a point on the rotor. The rotor rotation is approximately proportional to the volume flow in the pipe. A major advantage of the turbine meter is that each pulse corresponds to a finite incremental volume of fluid, and the pulses are digital and can be summed easily. Liquid-flow turbine meters have as few as two blades and produce a constant number of pulses per unit fluid volume over a 5 1 flow-rate range with 0.25 percent accura...
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