Ultrasonic Temperature Profiling System for Detecting Critical Heat Flux in Non-Uniformly Heated Tube Bundles

[+] Author and Article Information
A. R. Barber, K. E. Kneidel

Babcock and Wilcox Co., Research and Development Division, Alliance, OH

C. S. Fitzgerald

Babcock and Wilcox Co., Research and Development Division, Lynchburg, VA

L. C. Lynnworth

Head of Ultrasonics Department, Parametrics, Inc., Waltham, MA

J. Heat Transfer 101(4), 622-627 (Nov 01, 1979) (6 pages) doi:10.1115/1.3451047 History: Received February 05, 1979; Online August 11, 2010


A new ultrasonic instrumentation system was developed and applied to the problem of detecting critical heat flux (CHF) in experiments that simulate a nuclear reactor fuel assembly. This instrumentation system used the principles of ultrasonic thermometry to detect and locate CHF in a tube bundle with non-uniform axial heat generation. The technique consists of measuring the time between pairs of ultrasonic echoes that reflect from a sequence of evenly spaced discontinuities along a sensor. Each measurement of time is directly related to the temperature of a specific segment of a sensor. The system was designed to handle many 16-zone sensors at a high rate of data acquisition so that CHF could be rapidly detected and accurately located. This paper includes a description of the sensor and the signal processing techniques as well as examples of the system’s response to CHF.

Copyright © 1979 by ASME
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