Velocity Profiles of Liquid Flow Through Circular Tubes and How They Affect Flow Measurement

[+] Author and Article Information
D. Yogi Goswami

Solar Energy and Energy Conversion Research Laboratories, Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611

J. Sol. Energy Eng 113(3), 206-210 (Aug 01, 1991) (5 pages) doi:10.1115/1.2930494 History: Received September 01, 1990; Revised March 01, 1991; Online June 06, 2008


This paper analyzes velocity profiles for flow through circular tubes in laminar, turbulent, and transition region flows and how they affect measurement by flow-meters. Experimental measurements of velocity profiles across the cross-section of straight circular tubes were made using laser doppler velocimetry. In addition, flow visualization was done using the hydrogen bubble technique. Velocity profiles in the laminar and the turbulent flow are quite predictable which allow the determination of meter factors for accurate flow measurement. However, the profiles can not be predicted at all in the transition region. Therefore, for the accuracy of the flowmeter, it must be ensured that the flow is completely in the laminar regime or completely in the turbulent regime. In the laminar flow a bend, even at a large distance, affects the meter factor. The paper also discusses some strategies to restructure the flow to avoid the transition region.

Copyright © 1991 by The American Society of Mechanical Engineers
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