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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

THE COMBINED EFFECTS OF WALL AND FLUID AXIAL CONDUCTION ON LAMINAR HEAT TRANSFER IN CIRCULAR TUBES

Get access (open in a dialog) DOI: 10.1615/IHTC7.1590
pages 131-136

Sinopsis

A finite difference method was used to study the effects of simultaneous fluid and wall axial conduction on the thermal behaviour of a long, thin-walled circular tube which is uniformly heated centrally over a finite length. Laminar fully-developed flow is assumed, and axial conduction in the tube-wall is characterized by a single dimensionless parameter K. The presented results include the axial distributions of convective heat flux at the fluid-wall interface, tube wall temperature, fluid bulk temperature and local Nusselt number over a Peclet number (Pe) range of 5 to 45, each at four different values of K, and with a heated length of (Pe/2) tube diameters. The results show very significant preheating and post-heating, with the thermal characteristics around the entrance and exit of the heated section dependent on both K and Pe.