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Mathematical Problems in Engineering
Volume 2013, Article ID 273764, 8 pages
http://dx.doi.org/10.1155/2013/273764
Research Article

CFD Analysis of Heat Transfer and Friction Factor Characteristics in a Circular Tube Fitted with Quadrant-Cut Twisted Tape Inserts

1Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
2Biochemical Engineering Department, Al-Khwarizmi College of Engineering, University of Baghdad, Baghdad 47024, Iraq

Received 20 June 2013; Revised 7 September 2013; Accepted 9 September 2013

Academic Editor: Anuar Ishak

Copyright © 2013 Sami D. Salman et al. 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

This paper reports numerical investigations of heat transfer and friction factor characteristics in swirling flow conditions using CFD simulation. A commercial CFD package, FLUENT 6.3.26, was used in this study. 3D models for circular tube fitted with classical and quadrant-cut twisted tape (QCT) inserts with three twist ratios ( = 2.93, 3.91, and 4.89) and different cut depths ( = 0.5, 1.0, and 1.5 cm) were generated for the simulation. The data obtained from the CFD simulation were verified with the literature correlations of plain tube with the discrepancy of less than ±8% for Nusselt number and ±10% for friction factor. The results show that there was a significant increase in heat transfer coefficient and friction factor in the tube fitted with quadrant-cut twisted tape (QCT) with decreasing of twist ratio () and cut depth (). Furthermore, the configuration of QCT insert with a twist ratio of = 2.93 and a cut depth of = 0.5 cm offered higher heat transfer rate and friction factor than other twist ratios.