Research Papers: Flows in Complex Systems

Friction Factor Measurements in an Equally Spaced Triangular Array of Circular Tubes

[+] Author and Article Information
Peter Vassallo1

 Lockheed Martin Corporation, Schenectady, NY 12301vassall@kapl.gov

Paul Symolon

 Lockheed Martin Corporation, Schenectady, NY 12301


Corresponding author.

J. Fluids Eng 130(4), 041105 (Apr 04, 2008) (5 pages) doi:10.1115/1.2903817 History: Received September 04, 2007; Revised October 10, 2007; Published April 04, 2008

Friction factor data for adiabatic cross flow of water in a staggered tube array were obtained over a Reynolds number range (based on hydraulic diameter and gap velocity) of about 10,000–250,000. The tubes were 12.7mm(0.5in.) outer diameter in a uniformly spaced triangular arrangement with a pitch-to-diameter ratio of 1.5. The friction factor was compared to several literature correlations and was found to be best matched by the Idelchik correlation. Other correlations were found to significantly vary from the test data. Based on the test data, a new correlation is proposed for this tube bundle geometry, which covers the entire Reynolds number range tested.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Schematic of triangular tube array

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Figure 2

Test section schematic (not to scale)

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Figure 3

Loss factors versus position in the test section

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Figure 4

Cross-flow friction factor data versus other sources



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