Nanofluid turbulent convective flow in a circular duct with helical turbulators considering CuO nanoparticles

• Published in: International journal of heat and mass transfer Vol. 124; pp. 980 - 989
• Main Authors: Sheikholeslami, M., Jafaryar, M., Li, Zhixiong
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-09-2018; Elsevier BV
• Subjects: Boundary layer thickness; Computational fluid dynamics; Computer simulation; Convective flow; Finite volume method; Fluid flow; Forced convection; Heat exchangers; Heat transfer; Helical twisted tape; Nanofluid; Nanofluids; Nanoparticles; Numerical simulation; Reynolds number; Secondary flow; Thermal boundary layer; Turbulent flow; Helical twisted tape; Numerical simulation; Forced convection; Turbulent flow; Nanofluid
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2018.04.022

•Nanofluid forced convection heat transfer in a pipe is investigated.•Twisted tape turbulator is selected as passive technique.•Nusselt number decreases with increase of PR.•Nusselt number enhances with increase of Re, BR.
Nanofluid heat transfer augmentation in a heat exchanger equipped with helical twisted tape turbulator is simulated numerically via Finite volume method. Impacts of width ratio, Reynolds number and pitch ratio on nanofluid hydrothermal behavior were illustrated. Related formulas for Nusselt number and Darcy factor are provided according to obtained results. Outputs show that thermal boundary layer thickness decreases with augment of width ratio due to stronger secondary flow. Better nanofluid mixing can be obtained for lower values of pitch ratio.