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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 752721, 17 pages
http://dx.doi.org/10.1155/2014/752721
Research Article

Influences of RVG Positions on the Periodic Flow Profiles

Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand

Received 9 March 2014; Revised 2 May 2014; Accepted 5 May 2014; Published 26 June 2014

Academic Editor: Mohamed A. Seddeek

Copyright © 2014 Withada Jedsadaratanachai. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effects on the positions of rib vortex generators (RVGs) for periodic laminar flow behavior are presented numerically in three-dimensional. The RVGs with constant blockage ratio (b/H, BR = 0.15), the pitch ratio (P/H, PR = 1), and flow attack angle ( ) are inserted in isothermal walls of the square channel. The SIMPLE algorithm and the finite volume method (FVM) are applied for the computational domain. The influences of different gap ratios ( = 0–0.35) for Reynolds number based on the hydraulic diameter ( ), Re = 100–1200, are investigated. It is found that the flow profiles can be divided into two parts; the first, similar in flow configuration, but different in values, is called “periodic flow” and the second, similar in both flow configuration and values, is called “fully developed periodic flow.” The results reveal that the periodic flow profiles appear around 2nd-3rd modules while the fully developed flow profiles occur around 6th–9th modules. In addition, the periodic flow profiles and fully developed periodic flow profiles become faster in case of the lowest continuous flow area ( = 0.20, 0.25, and 0.30) and the regimes close to the RVG.