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HAGEN NUMBER VERSUS BEJAN NUMBER

ABSTRACT
This study presents Hagen number vs. Bejan number. Although their physical meaning is not the same because the former represents the dimensionless pressure gradient while the latter represents the dimensionless pressure drop, it will be shown that Hagen number coincides with Bejan number in cases where the characteristic length (l) is equal to the flow length (L). Also, a new expression of Bejan number in the Hagen-Poiseuille flow will be introduced. At the end, extending the Hagen number to a general form will be presented. For the case of Reynolds analogy (Pr = Sc = 1), all these three definitions of Hagen number will be the same.
KEYWORDS
PAPER SUBMITTED: 2013-08-21
PAPER ACCEPTED: 2013-08-25
PUBLISHED ONLINE: 2013-08-25
DOI REFERENCE: https://doi.org/10.2298/TSCI1304245A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2013, VOLUME 17, ISSUE 4, PAGES [1245 - 1250]
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