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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018015783
pages 439-456

EXPERIMENTAL STUDIES OF WATER-BASED TITANIUM OXIDE NANOFLUID IN A CIRCULAR PIPE UNDER TRANSITION FLOW WITH CONICAL STRIP INSERTS

M. Arulprakasajothi
Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Avadi, Chennai-600 062, India
K. Elangovan
Department of Mechanical Engineering, Cambridge Institute of Technology, Bangalore, 560036, India
U. Chandrasekhar
Department of Aeronautical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Avadi, Chennai-600 062, India
S. Suresh
Department of Mechanical Engineering, National Institute of Technology, Trichy, 620015, India

ABSTRAKT

The heat transfer characteristics of a horizontal circular tube in a transition regime with conical strip inserts are determined experimentally. A water-based titanium oxide nanofluid was employed as a heat transfer fluid and was prepared using a two-step method with the volume concentration of 0.1 vol.% and 0.5 vol.%. Staggered and nonstaggered conical strips having three different twist ratios are employed. It was observed that the heat transfer performance of the nanofluids increases with the particle volume fraction. Moreover, the heat transfer performance increased enormously with the use of conical strip inserts in comparison with a plain tube. It was also observed that the strip geometry and nanofluid had a major effect on the thermal performance of the circular tube. The maximum Nusselt number was achieved using the staggered type of strips for both forward and backward directions at the Reynolds number 5790.3 with 0.5 vol.% concentration and at a twist ratio of 5 of a conical strip insert.


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