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TECHNICAL BRIEFS

Drag Coefficient and Stanton Number Behavior in Fluid Flow Across a Bundle of Wing-Shaped Tubes

[+] Author and Article Information
Andrej Horvat, Borut Mavko

 Jožef Stefan Institute, Reactor Engineering Division, Jamova 39, SI 1001, Ljubljana, Slovenia

J. Heat Transfer 128(9), 969-973 (Mar 05, 2006) (5 pages) doi:10.1115/1.2241746 History: Received April 16, 2005; Revised March 05, 2006

Transient numerical simulations of fluid and heat flow were performed for eight heat exchanger segments with cylindrical and wing-shaped tubes in staggered arrangement. Their hydraulic diameters dh were from 0.5824 to 3.899cm for the cylindrical tubes, and from 0.5413 to 3.594cm for the wing-shaped tubes. Based on the recorded time distributions of velocity uf(t) and temperature Tf(t), time average Reynolds number Re¯, drag coefficient C¯d, and Stanton number St¯ were calculated. In general, the drag coefficient and the Stanton number are smaller for the wing-shaped tubes than for the cylindrical tubes. However, with an increasing hydraulic diameter, these differences between both forms of tubes diminish. The time average values were further used to construct the drag coefficient and the Stanton number as polynomial functions C¯d(dh,Re¯) and St¯(dh,Re¯).

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometrical arrangement of heat exchanger structure for p∕d=1.25; cylindrical (left) and wing (right) form

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Figure 2

Drag coefficient approximation functions 10,11 for (a) the cylindrical form and (b) the wing form

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Figure 3

Drag coefficient distribution for the cylindrical form (◆) and the wing form (∎); (a)p∕d=1.125, (b)p∕d=1.25, (c)p∕d=1.5, and (d)p∕d=2.0

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Figure 4

Stanton number approximation functions 12,13 for (a) the cylindrical form and (b) the wing form

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Figure 5

Stanton number distribution for the cylindrical form (◆) and the wing form (∎); (a)p∕d=1.125, (b)p∕d=1.25, (c)p∕d=1.5, and (d)p∕d=2.0

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