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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018026222
pages 851-863

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

D. Mageshbabu
Department of Mechanical Engineering, S.A. Engineering College, Chennai-600077, Tamil Nadu, India
A. E. Kabeel
Mechanical Power Engineering Department, Faculty of Engineering, Tanta University, Egypt
Ravishankar Sathyamurthy
Mechanical Power Engineering Department, Faculty of Engineering, Tanta University, Egypt; Department of Automobile Engineering, Hindustan Institute of Technology and Science, Chennai- 603103, Tamil Nadu, India
S. A. El-Agouz
Mechanical Power Engineering Department, Faculty of Engineering, Tanta University, Egypt
Ali J. Chamkha
Department of Mechanical Engineering, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Kingdom of Saudi Arabia; RAK Research and Innovation Center, American University of Ras Al Khaimah, United Arab Emirates, 10021
M. S. Girija
Department of Computer Science and Engineering, Jeppiaar Engineering College, Chennai-600119, Tamil Nadu, India
B. Madhu
Department of Mechanical Engineering, Velammal Institute of Technology, Chennai, Tamil Nadu, India

SINOPSIS

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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