Measurement of Laminar Flow Development in a Square Duct Using a Laser-Doppler Flowmeter

[+] Author and Article Information
R. J. Goldstein, D. K. Kreid

Heat Transfer Laboratory, School of Mechanical and Aerospace Engineering, University of Minnesota, Minneapolis, Minn.

J. Appl. Mech 34(4), 813-818 (Dec 01, 1967) (6 pages) doi:10.1115/1.3607839 History: Received January 11, 1967; Online September 14, 2011


A system for precision measurement of fluid velocity is developed and applied to determine the laminar flow distribution in a square duct. The experimental technique consists of measuring the Doppler shift of laser radiation scattered by particles moving with the fluid. From this frequency shift, the fluid velocity is inferred. Measurements in the entrance region and fully developed flow region of a square duct indicate that the velocity profile development takes place in a somewhat longer section of the duct than had been predicted. Measurements of the fully developed flow indicate that the optical technique used is capable of measuring velocity within an accuracy of at least 0.1 percent.

Copyright © 1967 by ASME
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