Single-Phase Heat Transfer and Pressure Drop Characteristics of an Integral-Spine Fin Within an Annulus.
Single-Phase Heat Transfer and Pressure Drop
Characteristics of an Integral-Spine Fin Within an
Annulus.
(766 K)
Kedzierski, M. A.; Kim, M. S.
NISTIR 5454; 33 p. June 1994.
Journal of Enhanced Heat Transfer, Vol. 3, No. 3,
201-210, 1996.
Available from:
National Technical Information Service
Order number: PB94-194073
Keywords:
annulus; enhanced heat transfer; heat transfer;
spine-fin; friction; water; ethylene glycol; prandtl
number
Abstract:
The laminar, single-phase heat transfer and friction
characteristics of a porcupine-like surface
(integral-spine-fin) within an annulus are presented.
The heat-transfer coefficient was determined using a
modified version of the Wilson Plot method on a 3 m test
section. Three fluids were investigated: (1) water, (2)
34% ethylene glycol/water mixture, and (3) 40% ethylene
glycol/water mixture. These fluids produced a
significant variation in the Prandtl number so that its
exponential dependence could be determined. The annulus
Reynolds numbers were varied from 100 to 1400 to obtain
the Reynolds number exponent. An empirical correlation
for the Nusselt number that accounts for the development
of the thermal boundary layer is presented. An
empirical correlation for the fanning friction factor is
also provided. It is shown that the spines enhance the
heat transfer through additional surface area and fluid
mixing.
