Title

The role of turbulence length scale and turbulence intensity on forced convection from a heated horizontal circular cylinder

Document Type

Article

Publication Date

2-1-2007

Publication Title

Experimental Thermal and Fluid Science

Volume

31

Issue

4

First Page

279

Keywords

Circular cylinder, Convective heat transfer, Turbulence intensity, Turbulence length scale

Last Page

289

Abstract

The effects of turbulence integral length scale and turbulence intensity on the convective heat transfer rate from a heated circular cylinder in crossflow of air were investigated. An aluminium cylinder of diameter 50.8 cm (2″) and with uniform surface temperature was placed horizontally in a wind tunnel. The cylinder was subjected to a homogeneous, isotropic turbulent flow, which was generated using a perforated plate. The cylinder surface temperature was monitored and measured with five embedded thermocouples. Tests were conducted at a Reynolds number of 27,700, relative turbulence intensity, Tu from 2.9% to 8.3% and turbulence integral length scale to cylinder diameter ratio, L/D from 0.50 to 1.47. For L/D = 0.78, heat transfer increased with increasing turbulence intensity, whereas for Tu = 6.9%, heat transfer decreased with increasing turbulence length scale. © 2006 Elsevier Inc. All rights reserved.

DOI

10.1016/j.expthermflusci.2006.04.007

ISSN

08941777

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