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Research Papers: Heat Transfer Enhancement

The Effect of the Corrugation Rib Angle of Attack on the Fluid Flow and Heat Transfer Characteristics Inside Corrugated Ribbed Passage

[+] Author and Article Information
A. M. I. Mohamed

Faculty of Engineering, Port-Said University, Port-Said 42523, Egypt

R. Hoettiba

 Suez Canal Authority, Port-Said 42523, Egypt

A. M. Saif

Mechanical Power Engineering, Faculty of Engineering, Port-Said University, Port-Said 42523, Egypt

J. Heat Transfer 133(8), 081901 (Apr 26, 2011) (10 pages) doi:10.1115/1.4003668 History: Received April 16, 2010; Revised February 07, 2011; Published April 26, 2011; Online April 26, 2011

Heat transfer enhancement using corrugated ribbed passages is one of the common enhancement techniques inside heat exchangers. The present study investigated numerically the effect of the corrugation rib angle of attack on the fluid flow and heat transfer characteristics inside the corrugated ribbed passage. The commercial computational fluid dynamics code PHOENICS 2006 was used to perform the numerical analysis by solving the Navier–Stokes and energy equations. The experimental part of this study was used only to validate the numerical model, and a good agreement between the experimental results and the model was obtained. The flow field characteristics and heat transfer enhancement were numerically investigated for different corrugated rib angles of attack as follows: 90 deg, 105 deg, 120 deg, 135 deg, and 150 deg. The corrugation rib angle of attack has a great effect on the reversed flow zone, the flow reattachments, and the enhancement of the heat transfer coefficient through the duct. The recommended rib angle of attack, which gives the optimum thermohydraulic performance, is found to be between 135 deg and 150 deg. The value of the maximum thermohydraulic performance is about 3.6 for the 150 deg rib angle of attack at a Reynolds number equal to 10,000.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 19

The variation in the predicted average value of the Nusselt number enhancement ratio with Reynolds number for corrugated passage at various angles of attack (α) and smooth passage

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Figure 20

The variation in the predicted average value of thermohydraulic performance with Reynolds number for corrugated passage at various angles of attack (α) and smooth passage

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Figure 21

Relation between the thermohydraulic performance and the angle of attack at Re=10,000

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Figure 18

The variation in the predicted average value of the Nusselt number with Reynolds number for corrugated passage at various angles of attack (α) and smooth passage

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Figure 17

The predicted temperature contours (°C) for different angles of attack (α) of corrugated ribbed passages and smooth passage at Re=10,000

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Figure 16

The predicted turbulence kinetic energy (m2/s2) contours for different angles of attack (α) of corrugated ribbed passages and smooth passage at Re=10,000

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Figure 15

The variation in the predicted average value of the friction factor ratio with Reynolds number for corrugated passage at various angles of attack (α) and smooth passage

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Figure 14

The variation in the predicted average value of the friction factor with Reynolds number for corrugated passage at various angles of attack (α) and smooth passage

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Figure 13

Pressure contours (kPa) for different angles of attack (α) of corrugated ribbed passages and smooth passage at Re=10,000

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Figure 12

The predicted secondary velocity (Uz) profiles at different locations for various angles of attack (α) of corrugated passage at Re=10,000

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Figure 11

The predicted secondary velocity (Uy) profiles at different locations for various angles of attack (α) of corrugated passage at Re=10,000

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Figure 10

The predicted streamwise velocity (Ux) profiles at different locations for various angles of attack (α) of corrugated passages at Re=10,000

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Figure 9

Secondary velocity contours (Uz, m/s) for different angles of attack (α) of corrugated ribbed passages and smooth passage at Re=10,000

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Figure 8

Secondary velocity contours (Uy, m/s) for different angles of attack (α) of corrugated ribbed passages and smooth passage at Re=10,000

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Figure 7

Streamwise velocity contours (Ux, m/s) for different angles of attack (α) of corrugated ribbed passages and smooth passage at Re=10,000

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Figure 6

Comparison between numerical and experimental normalized dimensionless velocity component parallel to the wall at various Reynolds numbers in ribbed passage

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Figure 5

Comparison between numerical and experimental results of average Nusselt number and friction factor for both smooth and corrugated ribbed passages at various Reynolds numbers

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Figure 4

Experimental test rig

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Figure 3

Grid system of the corrugated ribbed passage

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Figure 2

Flow direction and the corrugation angle of attack

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Figure 1

Geometry of corrugated ribbed passage

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