Numerical Study on the Heat Transfer Characteristics of Cu-Water and TiO 2 -Water Nanofluid in a Circular Horizontal Tube

Jefferson Raja Bose, Stephen Manova, Appadurai Anitha Angeline, Lazarus Godson Asirvatham () and Sneha Gautam ()
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Jefferson Raja Bose: Department of Mechanical Engineering, School of Engineering and Technology, Karunya Institute of Technology and Sciences, Coimbatore 641 114, Tamil Nadu, India
Stephen Manova: Department of Mechanical Engineering, School of Engineering and Technology, Karunya Institute of Technology and Sciences, Coimbatore 641 114, Tamil Nadu, India
Appadurai Anitha Angeline: Department of Robotics Engineering, School of Engineering and Technology, Karunya Institute of Technology and Sciences, Coimbatore 641 114, Tamil Nadu, India
Lazarus Godson Asirvatham: Department of Mechanical Engineering, School of Engineering and Technology, Karunya Institute of Technology and Sciences, Coimbatore 641 114, Tamil Nadu, India
Sneha Gautam: Department of Civil Engineering, Karunya Institute of Technology and Sciences, Coimbatore 641 114, Tamil Nadu, India

Energies, 2023, vol. 16, issue 3, 1-12

Abstract: A numerical simulation of convective heat transfer coefficient ( h conv ) was studied with Cu-Water and TiO 2 -Water nanofluids flowing through a circular tube subjected to uniform wall heat flux boundary conditions under laminar and turbulent regimes. Four different concentrations of nanofluids (ɸ = 0.5, 1, 1.5 and 2%) were used for the analysis and the Reynolds number (Re) was varied from laminar (500 to 2000) to turbulent flow regime (5000 to 20,000). The dependence of h conv on Re and ɸ was investigated using a single-phase Newtonian approach. In comparison to base fluid, average h conv enhancements of 10.4% and 7.3% were noted, respectively, for the maximum concentration (ɸ = 2%) and Re = 2000 for Cu-Water and TiO 2 —water nanofluids in the laminar regime. For the same ɸ under the turbulent regime (Re = 20,000), the enhancements were noted to be 14.6% and 13.2% for both the nanofluids, respectively. The random motion (Brownian motion) and heat diffusion (thermophoresis) by nanosized particles are the two major slip mechanisms that have more influence on the enhancement of h conv . In addition, the Nusselt number (Nu) of the present work was validated for water with the Shah and Dittus Boelter equation and found to have good agreement for both the regimes.

Keywords: maximum copper; titanium oxide; nanoparticle; convection; heat transfer; flow regime (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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