Loss Coefficients for Abrupt Changes in Flow Cross Section With Low Reynolds Number Flow in Single and Multiple-Tube Systems
- 1 November 1950
- journal article
- research article
- Published by ASME International in Transactions of the American Society of Mechanical Engineers
- Vol. 72 (8) , 1067-1074
- https://doi.org/10.1115/1.4016919
Abstract
In testing for the flow-friction characteristics of compact heat-exchanger surfaces concurrent with heat-transfer tests, more precise data on the flow contraction- and expansion-loss coefficients are required than are presently available in the literature. This paper presents a theory for evaluating these coefficients for both single- and multiple-tube systems for various contraction and expansion geometries. The analysis takes into account the contraction and expansion area ratio and the velocity distribution. Results of experiment for the Reynolds number range 500–20,000 are presented which compare well with the analysis. This paper was originally presented at the June, 1949, meeting of the Heat Transfer and Fluid Mechanics Institute, and included only experimental data on multiple-tube systems. Since that time experiments have been performed on single-tube systems and these later results are presented here.Keywords
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