Loss Characteristics of Orifices and Nozzles

[+] Author and Article Information
S. H. Alvi

Aligarh Muslim University, Aligarh, India

K. Sridharan, N. S. Lakshmana Rao

Indian Institute of Science, Bangalore, India

J. Fluids Eng 100(3), 299-307 (Sep 01, 1978) (9 pages) doi:10.1115/1.3448670 History: Received December 23, 1975; Online October 12, 2010


Loss characteristics of sharp-edged orifices, quadrant-edged orifices for varying edge radii, and nozzles are studied for Reynolds numbers less than 10,000 for β ratios from 0.2 to 0.8. The results may be reliably extrapolated to higher Reynolds numbers. Presentation of losses as a percentage of meter pressure differential shows that the flow can be identified into fully laminar regime, critical Reynolds number regime, relaminarization regime, and turbulent flow regime. An integrated picture of variation of parameters such as discharge coefficient, loss coefficient, settling length, pressure recovery length, and center line velocity confirms this classification.

Copyright © 1978 by ASME
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