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- Title
HAGEN NUMBER VERSUS BEJAN NUMBER.
- Authors
AWAD, Mohamed M.
- 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 is equal to the flow length. 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= = I), all these three definitions of Hagen number will be the same.
- Subjects
THERMAL diffusivity; HAGEN, Gotthilf Heinrich Ludwig; POISEUILLE flow; HEAT conduction; THERMAL properties of condensed matter; CHANNEL flow
- Publication
Thermal Science, 2013, Vol 17, Issue 4, p1245
- ISSN
0354-9836
- Publication type
Article
- DOI
10.2298/TSCI1304245A