ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
THE COMBINED EFFECTS OF WALL AND FLUID AXIAL CONDUCTION ON LAMINAR HEAT TRANSFER IN CIRCULAR TUBES
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.