Numerical Study of Laminar Flow and Convection Heat Transfer of Nanofluids inside Circular Tube

Abstract:

This paper presents a numerical study on laminar flow and convective heat transfer of nanofluids in a circular tube under constant wall heat flux boundary condition. Single phase model is used for simulating the heat transfer and flow behaviors of three different nanofluids. The effects of nanoparticle concentrations, nanoparticle diameter, nanoparticle material and Reynolds number on the Nusselt number and wall shear stress of nanofluids are determined and discussed in details. The comparison of Nusselt number of CuO-EG/water, SiO₂-EG/water and Al₂O₃-EG/water nanofluids are presented. The results show that Nusselt number clearly increases with an increase in the nanoparticle concentration and flow Reynolds number, while the nanoparticle diameter has an opposite effect on the Nusselt number. Compared to SiO₂-EG/water and Al₂O₃-EG/water nanofluids, CuO-EG/water nanofluids give higher Nusselt number with the same nanoparticle concentrations. The results also show that wall shear stress increases with increasing nanoparticle volume concentration.

• Periodical: Advanced Materials Research (Volumes 960-961)
• Pages: 299-303
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.960-961.299
• Online since: June 2014
• Authors: Ning Bo Zhao, Shu Ying Li*, Jia Long Yang, Zhi Tao Wang, Hui Meng
• Keywords: Convection Heat Transfer, Laminar Flow, Nanofluid, Nanoparticle

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