Thermal Performance Ratio of Finned Tube Heat Exchanger with Wire Coil Inserts for Flow of Fe3O4-water Nanofluid
Mohammad Sikindar Baba†*, A.V. Sita Rama Raju†, K.Srinivasa Chalapathi†, Surisetty Naga
† Department of Mechanical Engineering, Anurag University, Hyderabad, Telangana, India,
‡ Department of Mechanical Engineering, RSREC Kadanuthala, Andhra Pradesh, India
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This article reports an experimental study of forced convective heat transfer between hot water and Fe3O4 – water nanofluid in finned tube counter flow heat exchanger with wire coil inserts. The convective heat transfer rate, friction factor and thermal performance ratio are investigated for the flow of 0.4 % vol. Fe3O4 – water nanofluid in a tube with eight internal longitudinal fins under turbulent flow (7000 < Re < 49200) with the wire coil inserts of 2 mm, 6 mm and 12 mm pitch. Results indicate that the thermal performance ratio is higher for the wire coil insertion of 2 mm pitch compared to the finned tube without insert. Maximum Thermal performance ratios are 1.58, 1.15 and 1.13 for wire coil inserts with 2 mm, 6 mm and 12 mm pitch respectively at nanofluid flow rate of 10 LPM.