Periodic Laminar Forced Convection in a Circular Tube with Double Twisted Tapes

Authors

  • Amnart Boonloi King Mongkut’s University of Technology North Bangkok

Keywords:

circular tube, double twisted tapes, laminar flow, heat transfer, pressure loss, periodic flow

Abstract

Fully developed laminar flow and heat transfer behavior in a circular tube with double twisted tapes are presented numerically. The computational domain is solved by the finite volume method. The numerical results are presented for Reynolds number, Re = 100 – 2000. The influences of the double twisted tapes; twisted ratio (y/W, TR = 1–6) and rotations of the twisted tapes (co–rotating and counter–rotating), on heat transfer, flow structure and thermal performance are studied and compared with single twisted tape under similar conditions. The use of the double twisted tapes can create swirl flows over the test section that helps to improve heat transfer rate and thermal performance. The rise of TR leads to decrease in Nusselt number and friction factor values. The co–rotating twisted tapes case gives higher level of vortex strength and thermal performance than the counter–rotating twisted tapes case, but provides nearly value of friction factor. In range studies, the optimum thermal enhancement factors, TEF are around 2.70 and 2.30 for the co–rotating and counter–rotating cases, respectively.

 


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Published

2014-08-15

How to Cite

Boonloi, A. (2014). Periodic Laminar Forced Convection in a Circular Tube with Double Twisted Tapes. Asian Journal of Applied Sciences, 2(4). Retrieved from https://www.ajouronline.com/index.php/AJAS/article/view/1569

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