Effect of mixed convection and u-bends on the design of double-pipe heat exchangers

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · Heat Transfer Engineering

DOI:https://doi.org/10.1080/014576399271394· OSTI ID:20001219

Abdelmessih, A N; Bell, K J

For horizontal flow in the laminar flow regimen, the interaction between natural and forced convection and the effect of the secondary flow induced by an unheated U-bend were considered in developing an empirical correlation for the nearly uniform heat flux condition. The correlation predicts the local peripheral average heat transfer coefficient with an absolute average deviation of 9.9%. In this article the mechanisms involved in laminar flow with the presence of a U-bend are explained. The realistic behavior of the correlation is illustrated. Also, a brief discussion of some of the existing correlations for laminar flow is presented. Four cases showing the practicality of using the correlation in the design of horizontal double-pipe heat exchangers are demonstrated.

• Research Organization: Saint Martin's Coll., Lacey, WA (US)
• OSTI ID: 20001219
• Journal Information: Heat Transfer Engineering, Journal Name: Heat Transfer Engineering Journal Issue: 3 Vol. 20; ISSN 0145-7632; ISSN HTEND2
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CONVECTION
ENERGY EFFICIENCY
HEAT EXCHANGERS
LAMINAR FLOW
PERFORMANCE