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Heat Transfer Research

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ISSN Druckformat: 1064-2285

ISSN Online: 2162-6561

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ENHANCING THE THERMAL PERFORMANCE OF A MICRO FINNED TUBE WITH TiO2–WATER NANOFLUIDS USING TWISTED TAPE INSERTS

Volumen 50, Ausgabe 9, 2019, pp. 851-863
DOI: 10.1615/HeatTransRes.2018026222
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ABSTRAKT

This paper investigates the heat transfer characteristics and friction factor of finned microtube fitted with twisted tape inserts. Results show that the performance of the finned microtube with nanofluid depends on concentration of nanoparticles, pitch ratio, and the type of the pitch used. With increase in the concentration of nanoparticle with the base fluid the viscosity of the nanofluid increased by 30% compared to the fluid with concentration of 0.05%. The increase in the concentration of nanoparticles leads to increased pressure drop and pumping power. For the Reynolds number Re = 2000, the maximum performance ratio is found to be 1.5, 2.05, 2.1, and 2 for 0, 0.05, 0.1, and 0.2% concentration ratio, respectively. Similarly, with increase in the Reynolds number from 2000 to 10,000 the performance ratio decreases. Moreover, the results of performance ratio revealed that the use of a nanofluid have performance more than unity. Similarly, the performance of finned microtube heat exchanger is higher in the case of twist ratio (LR-Y = 6) and concentration ratio (φ = 0.2%), as the turbulence inside the tube is greatly influenced by the boundary layer separation by the inserts for enhanced friction ratio (f/fp) and Nusselt number ratio (Nu/Nup) compared to a smooth plain tube.

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REFERENZIERT VON
  1. Devarajan Mageshbabu, Balasubramanian Madhu, Ramani Bharathwaaj, Sathyamurthy Ravishankar, Influence of regular inserts and aluminium oxide nanoparticles on micro finned tube over heat transfer and hydraulic performance under laminar flow, THIRD INTERNATIONAL CONFERENCE ON INVENTIVE MATERIAL SCIENCE APPLICATIONS: ICIMA 2020, 2281, 2020. Crossref

  2. Ranjbar Behnam, Rahimi Masoud, Mohammadi Faezeh, Exergy Analysis and Economical Study on Using Twisted Tape Inserts in CGS Gas Heaters, International Journal of Thermophysics, 42, 7, 2021. Crossref

  3. Arshi Banu P.S., Dhanapal Balaji, Mathevan Pillai T., Chellappa B., Sathyamurthy Ravishankar, Thermodynamic and hydraulic design characteristics of the fin tube heat exchanger, Materials Today: Proceedings, 62, 2022. Crossref

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