Thermal Enhancement in Tubes with Dual Twisted Tapes

• Published in: Applied Mechanics and Materials Vol. 751; no. Materials Science, Applied Mechanics and Advanced Engineering Research; pp. 239 - 244
• Main Authors: Changcharoen, Wayo, Pimsarn, Monsak, Kongkaitpaiboon, Vichan, Somravysin, Pratchya, Eiamsa-ard, Smith
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 01.04.2015
• Subjects: Algorithms; Constants; Fluid flow; Heat transfer; Mathematical models; Tubes; Turbulence; Turbulent flow; Walls; Heat Transfer Enhancement; Friction Factor; Dual Twisted Tapes; Dual Swirl Flows
• ISBN: 3038354511; 9783038354512
• ISSN: 1660-9336; 1662-7482; 1662-7482
• DOI: 10.4028/www.scientific.net/AMM.751.239

Influence of the dual twisted tapes (DTs) on the heat transfer enhancement in a circular tube is reported. The effects of twist ratio (y/w = 2.0, 3.0 and 4.0) on the heat transfer rate, friction factor, and thermal performance factor in a tube under constant wall heat flux were investigated in turbulent regions. Computations, based on a finite volume method, and the SIMPLE algorithm, were carried out by QUICK schemes. From the numerical results, heat transfer rate and pressure loss increased as twist ratio of tape (y/w) decreased. Based on the same pumping power consumption, the optimum thermal performance was achieved by the use of the tapes with twist ratio of 3.0. In addition, the predictions of flow-thermal phenomena (streamline, velocity vector, TKE and local Nusselt number) are also described.