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Heat Transfer Research
IF: 1.199 5-Year IF: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2018026222
pages 851-863


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
KPR Institute of Engineering and Technology
S. A. El-Agouz
Mechanical Power Engineering Department, Faculty of Engineering, Tanta University, Egypt
Ali J. Chamkha
Mechanical Engineering Department, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Saudi Arabia; RAK Research and Innovation Center, American University of Ras Al Khaimah, P.O. Box 10021, Ras Al Khaimah, United Arab Emirates
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


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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