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The sound wave analog of the laser velocimeter of fig

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Unformatted text preview: pered tube to an equilibrium position which is a measure of the fluid-flow rate. (Courtesy of Blue White Industries, Westminster, CA.) Cd Aa 1/2 2Wnet Afloat (6.121) fluid where Wnet is the float’s net weight in the fluid, Aa Atube Afloat is the annular area between the float and the tube, and Cd is a dimensionless discharge coefficient of order unity, for the annular constricted flow. For slightly tapered tubes, Aa varies nearly linearly with the float position, and the tube may be calibrated and marked with a flowrate scale, as in Fig. 6.35. The rotameter thus provides a readily visible measure of the flow rate. Capacity may be changed by using different-sized floats. Obviously the tube must be vertical, and the device does not give accurate readings for fluids containing high concentrations of bubbles or particles. Coriolis mass flowmeter. Most commercial meters measure volume flow, with mass flow then computed by multiplying by the nominal fluid density. An attractive modern alternative is a mass flowmeter which operates on the principle of the Coriolis...
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