Thermal Performance of a Tube Equipped with V-nozzle Turbulator Inserts
Journal Title: Mehmet Akif Ersoy Üniversitesi Uygulamalı Bilimler Dergisi - Year 2018, Vol 2, Issue 1
Abstract
This study pertains to the numerical investigation of the influence of V-nozzle turbulators on thermal performance in a circular tube under uniform heat flux condition. The convergingdiverging nozzles as a venturi structure were located in the test tube in order to generate turbulance/reverseflow. The computations were carried out by consideration of various pitch ratios, PR = 2, 4, and 6 for Reynolds numbers between 5000 and 32000, using air as a working fluid. The variation of Nusselt number (Nu) and friction factor (f) versus Reynolds number (Re) were introduced for the obtained numerical results. The plain tube results were compared with the works available in literature for confirmation of the used numerical method. The rates of increase in Nusselt number over the smooth tube were presented as 159-218 %, 144-201 % and 132-185 % in this study for PR=2, 4 and 6, respectively. In addition, heat transfer coefficient ratio values for V-nozzle turbulators with PR=2, 4 and 6 were around 1.77, 1.61, and 1.50, respectively. Consequently, the results demonstrated that the usage of Vnozzles at smaller pitch ratio yielded an increase in heat transfer rate and pressure loss.
Authors and Affiliations
Sibel Güneş, Orhan Keklikcioğlu, Toygur Dağdevir, Veysel Özceyhan
Keywords
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- EP ID EP418300
- DOI 10.31200/makuubd.349798
- Views 131
- Downloads 0
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