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TECHNICAL BRIEFS

Cooling of a Finned Cylinder by a Jet Flow of Air

[+] Author and Article Information
F. Gori

Department of Mechanical Engineering, University of Rome, “Tor Vergata,” Via del Politecnico, 1-00133 Rome, Italygori@uniroma2.it

M. Borgia, A. Doro Altan, M. Mascia, I. Petracci

Department of Mechanical Engineering, University of Rome, “Tor Vergata,” Via del Politecnico, 1-00133 Rome, Italy

Used to calibrate the thermocouples according to ITS90 standard.

Used to calibrate the single hot-film anemometry probe.

J. Heat Transfer 127(12), 1416-1421 (Mar 18, 2005) (6 pages) doi:10.1115/1.2098868 History: Received February 18, 2004; Revised March 18, 2005

A submerged slot jet of air is used to cool an externally finned cylinder, heated by electric current. The cylinder ensemble is made of a stainless steel finned tube and a Teflon bar core inside. Five thermocouples, pressed inside the steel tube by the Teflon bar, measure the wall temperature to determine local and mean convective heat transfer coefficients. The local Nusselt number has the maximum on the impinging point and the minimum on the rear point. The variation of local and mean Nusselt numbers with the distance from the slot exit is investigated. Empirical expressions are proposed to correlate the experimental data. The cooling of a finned cylinder with a jet flow realizes a higher heat transfer as compared to a smooth cylinder.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental setup

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Figure 2

Finned cylinder section

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Figure 3

Thermocouple positions

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Figure 4

Local Nusselt number at S∕H=8

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Figure 5

Local Nusselt number versus S∕H: (a) at the impingement point, (b) at 90° from the impingement point, and (c) at 180° from the impingement point

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Figure 6

Average Nusselt number versus S∕H

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Figure 7

Experimental average Nusselt numbers and predictions of Eq. 10

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Figure 8

Residual analysis using Eq. 11

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Figure 9

Mean Nusselt numbers in finned and smooth cylinders

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