Chapt06

632 a commercial handheld wind velocity turbine meter

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Unformatted text preview: flow-rate range (up to 100 1) Ability to handle very hot or very cold fluids Requirement of only a short pipe length Calibration insensitive to fluid density or viscosity | v v For further details see Ref. 40. | e-Text Main Menu | Textbook Table of Contents | Study Guide 394 Chapter 6 Viscous Flow in Ducts Fig. 6.33 A vortex flowmeter. (The Foxboro Company.) A B (a) R (b) T (c) | v v Fig. 6.34 Ultrasonic flowmeters: (a) pulse type; (b) doppler-shift type (from Ref. 41); (c) a portable noninvasive installation (courtesy of Polysonics Inc., Houston, TX). | e-Text Main Menu | Textbook Table of Contents | Study Guide 6.10 Fluid Meters 395 Ultrasonic flowmeters. The sound-wave analog of the laser velocimeter of Fig. 6.29h is the ultrasonic flowmeter. Two examples are shown in Fig. 6.34. The pulse-type flowmeter is shown in Fig. 6.34a. Upstream piezoelectric transducer A is excited with a short sonic pulse which propagates across the flow to downstream transducer B. The arrival at B triggers another pulse to be created at A, resulting in a regular pulse frequency fA. The same proce...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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