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ARTICLE
3D NUMERICAL ANALYSIS ON FLOW CONFIGURATIONS AND HEAT TRANSFER CHARACTERISTICS FOR FIN-AND-OVAL-TUBE HEAT EXCHANGER WITH V-DOWNSTREAM DELTA WINGLET VORTEX GENERATORS
Amnart Boonloia, Withada Jedasadaratanachaib,*
a Department of Mechanical Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok,
Bangkok 10800, Thailand
b Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
* Corresponding Author: Email:
Frontiers in Heat and Mass Transfer 2014, 5, 1-15. https://doi.org/10.5098/hmt.5.19
Abstract
3D numerical investigations for heat transfer characteristics and flow configurations in a fin–and-oval-tube heat exchanger with V-tip pointing
downstream delta winglet pairs (
DDWP) are examined. The
DDWPs are placed on the fin surface with pointing downstream and the oval tube row
number is set at three in a staggered arrangement. The flow attack angles (
θ = 15°, 30°, 45° and 60°) and the distance from V-tip to the oval tube
center in transverse axis (
a = 3.77, 4.77 and 5.77 mm) are investigated for Reynolds number based on hydraulic diameter,
Re = 500 – 2500. The
numerical results are compared with the previous experimental results and the validations of the grid system on both heat transfer and friction factor
are also reported. As the results, it is found that the use of the
DDWP performs higher heat transfer rate and the friction factor than the smooth fin
with no
DDWP for all cases. The vortex flows and the impinging jet of the flows over the oval-tube walls lead to the increase in heat transfer rate, but
also increase in pressure loss. The augmentations are maximum around 1.59 and 4.4 times higher than the smooth fin for heat transfer and friction
factor, respectively. In addition, the optimum thermal enhancement factor,
TEF, is around 1.09 at
Re = 2500,
a = 5.77 mm and
θ = 15°.
Keywords
Cite This Article
Boonloi, A., Jedasadaratanachai, W. (2014). 3D NUMERICAL ANALYSIS ON FLOW CONFIGURATIONS AND HEAT TRANSFER CHARACTERISTICS FOR FIN-AND-OVAL-TUBE HEAT EXCHANGER WITH V-DOWNSTREAM DELTA WINGLET VORTEX GENERATORS.
Frontiers in Heat and Mass Transfer, 5(1), 1–15.