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Technical Briefs

Novel Hub Fins for Axial Flow Fans for the Enhancement of Impingement Heat Transfer on a Flat Plate

[+] Author and Article Information
D. Sui

School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China

T. Kim1

MOE Key Laboratory for Strength and Vibration, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, P.R. Chinatongbeum@gmail.com

M. L. Xu, T. J. Lu

MOE Key Laboratory for Strength and Vibration, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, P.R. China

1

Corresponding author.

J. Heat Transfer 131(7), 074502 (Apr 30, 2009) (3 pages) doi:10.1115/1.3109244 History: Received February 23, 2008; Revised February 07, 2009; Published April 30, 2009

The thermal characteristics of exit flow issued from an axial fan widely used for impingement cooling of power electronics are experimentally studied. A new fan configuration is proposed to improve the impingement cooling performance at the center of a uniformly heated flat plate. Results demonstrate that the addition of fin attachments to the fan hub housing the driving motor intensifies reverse flow from the plate, leading to enhanced local heat transfer (up to 12%) relative to that of a reference fan. The effectiveness of hub fin attachments is limited to relatively short impinging distances (H/D<0.6).

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 2

Schematic of axial fan test setup

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Figure 3

Comparison of radial distributions of wall static pressure coefficient (Cp) at H/D=0.2 and 0.4

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Figure 4

Radial distributions of Nusselt number at H/D=0.2, 0.4, 1.0, and 2.0 and effectiveness of hub fins at the reverse flow region: (a) y/D versus Nu and (b) H/D versus Nu at y/D=0

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Figure 1

Conceptual design of axial flow fan with hub fins to promote flow perturbation below the fan hub

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