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Technical Briefs

Pressure Loss and Heat Transfer Characterization of a Cam-Shaped Cylinder at Different Orientations

[+] Author and Article Information
A. Nouri-Borujerdi

School of Mechanical Engineering, Sharif University of Technology, Tehran, Irananouri@sharif.eduScience and Research Branch, Islamic Azad University, Tehran, Irananouri@sharif.edu

Arash M. Lavasani

School of Mechanical Engineering, Sharif University of Technology, Tehran, Irana_lavasani@iauctb.ac.irScience and Research Branch, Islamic Azad University, Tehran, Irana_lavasani@iauctb.ac.ir

J. Heat Transfer 130(12), 124503 (Sep 22, 2008) (4 pages) doi:10.1115/1.2969259 History: Received January 04, 2007; Revised June 02, 2008; Published September 22, 2008

Pressure drag coefficient and heat transfer are experimentally investigated around a single noncircular cylinder in cross-flow under angle of attack 0deg<α<360deg and Reynolds number 1.5×104<Reeq<4.8×104 based on equivalent diameter of a circular cylinder. The results show that the trend of pressure drag coefficient against the angle of attack has a wavy shape but the wavy trend of the Nusselt number is smoother relative to the drag coefficient behavior. It is found that for lDeq=0.4 and over the whole range of the Reynolds number, the pressure drag coefficient has a minimum value of about CD=0.4 at α=30deg, 180 deg, and 330 deg and a maximum value of about CD=0.9 at α=90deg and 270 deg. The corresponding value of the mean Nusselt number to that of the equivalent circular tube is 1.05<Nu¯camNu¯cir<1.08 at α=90deg and 270 deg as well as 0.87<Nu¯camNu¯cir<0.92 at α=30deg and 180 deg.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a cam-shaped tube and thermocouple location in cross-flow

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Figure 2

(a) Pressure coefficient for three different l∕Deq and Reynolds number for α=0 deg and (b) pressure coefficient for three different l∕Deq and Reynolds number for α=270 deg

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Figure 3

Pressure drag coefficient of a cam-shaped and circular tubes versus angle of attack

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Figure 4

Length to diameter ratio effects on the pressure drag coefficient of a cam-shaped tube

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Figure 5

The average Nusselt number ratio of the cam-shaped tube to an equivalent circular tube

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