Single-Phase Heat Transfer and Pressure Drop Characteristics of an Integral-Spine Fin Within an Annulus (NISTIR 5454)

Published

January 1, 1996

Author(s)

Mark A. Kedzierski, M S. Kim

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.

Citation

NIST Interagency/Internal Report (NISTIR) - 5454

Report Number

5454

Volume

3

Issue

No. 3

NIST Pub Series

NIST Interagency/Internal Report (NISTIR)

Pub Type

NIST Pubs

Download Paper

https://doi.org/10.6028/NIST.IR.5454

Keywords

annulus, enhanced heat transfer, heat transfer, spine-fin, friction, water, ethylene glycol, prandtl number

Citation

Kedzierski, M. and Kim, M. (1996), Single-Phase Heat Transfer and Pressure Drop Characteristics of an Integral-Spine Fin Within an Annulus (NISTIR 5454), NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.IR.5454 (Accessed April 29, 2024)