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Technical Briefs

Efficiency Comparison Between Circular and Semicircular Fins Circumscribing Circular Pipes

[+] Author and Article Information
R. Chakraborty

Department of Chemical Engineering, Jadavpur University, Kolkata 700032, India

A. Sirkar

Department of Chemical Engineering, Haldia Institute of Technology, Haldia PIN-721657, India

J. Heat Transfer 133(4), 044501 (Jan 06, 2011) (4 pages) doi:10.1115/1.4002629 History: Received April 23, 2009; Revised July 23, 2010; Published January 06, 2011; Online January 06, 2011

A new design of fin has been conceived, which is in the shape of a semicircular strip. A step-by-step straightforward detailed derivation of the governing equations for two-dimensional temperature distribution in a semicircular fin has been presented, assuming a third degree polynomial. Numerical results are presented to illustrate the effects of pipe size and the number of semicircular fins on the thermal performance of the fin. It has been shown mathematically that the efficiency of a semicircular fin can be greater than that of a circular fin, having same total volume of fin material when employed over the circumference of a circular pipe.

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Copyright © 2011 by American Society of Mechanical Engineers
Topics: Pipes , Fins , Pipe sizes , Equations
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Figures

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Figure 1

(a) Schematic of typical semicircular fins (shaded part) circumscribing a circular pipe. (b) Schematic of a typical circular fin (shaded part) around a circular pipe.

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Figure 2

Schematic of a typical semicircular fin

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Figure 3

Comparison of efficiencies between circular and semicircular fins at different pipe sizes for five different semicircular fin numbers (i.e., 4, 5, 6, 7, and 10)

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Figure 4

Fractional change in efficiency as function of outer radius of pipe for five different semicircular fin numbers (i.e., 4, 5, 6, 7, and 10)

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