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HEAT TRANSFER ENHANCEMENT DUE TO CURVED WINGLET PAIRS IN FIN-TUBE HEAT EXCHANGERS

Hemant Naik
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

Shaligram Tiwari
Department of Mechanical Engineering, Indian Institute of Technology Madras Chennai, India, 600036

DOI: 10.1615/IHMTC-2017.520
pages 385-392

Abstract

Three-dimensional numerical investigations have been carried out to study the influence of curved rectangular vortex generators (CRVGs) on heat transfer enhancement in fin-tube heat exchangers. Heat transfer and flow characteristics are investigated for the fin-tube heat exchanger with CRVGs mounted upstream of inline tubes using commercial software ANSYS Fluent 17.2. The angular location of CRVGs has been varied for fixed values of length and height of VGs, separation between inline tubes and Reynolds number (Re). Flow and heat transfer characteristics are examined with the help of streamline plots and temperature contours. Enhancement in heat transfer has been quantified using span-averaged and overall Nusselt number while pressure drop is estimated in terms of friction factor. Relationship between secondary flow intensity and Nusselt number has been illustrated.

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