An experimental study on convective heat transfer and pressure drop during the movement of TiO2/water nanofluid through a helical coiled path
Lotfi M. Firoozzadeh M. Shiravi A.H. Sharipova A.
July 2023Springer Science and Business Media B.V.
Journal of Thermal Analysis and Calorimetry
2023#148Issue 136183 - 6195 pp.
Heat transfer enhancement in thermal systems is one of the most important efforts of researchers. Adding nanoparticles to circulating fluid is an effective way to increase the heat transfer rate, while its effect on pressure drop may be positive or negative in various cases. In this paper, both thermal and hydrodynamic aspects of flowing a TiO2/water nanofluid were considered with concentrations of 0.05, 0.1, 0.2, 0.5, and 1 mass percentages. The nanofluid was streamed through a helical coiled path, under a constant heat flux and different flow rates. The thermal characteristics are followed by calculations of Nusselt number (Nu), convective heat transfer coefficient, and heat transfer enhancement (HTE%). Accordingly, the utmost increase in Nusselt number was found as 29.8 and 36.5% for the concentration of 1 mass%, in laminar and turbulent flows, respectively. The pressure drop was assessed by means of friction factor and drag reduction percentage (DR%), so that in the lowest concentration and the lowest Reynolds number, the maximum DR% occurred as 6.4%. To have a better understanding of the system, the pumping power is reported against HTE% amounts.
Convective heat transfer , Helical coiled , Nanofluid , Pressure drop , Pumping power
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Department of Chemical Engineering, Jundi-Shapur University of Technology, Dezful, Iran
Department of Mechanical Engineering, Jundi-Shapur University of Technology, Dezful, Iran
Multiphase Flow Laboratory, Jundi-Shapur University of Technology, Dezful, Iran
Department of Metallurgy and Mineral Processing, Satbayev University, Almaty, Kazakhstan
Department of Chemical Engineering
Department of Mechanical Engineering
Multiphase Flow Laboratory
Department of Metallurgy and Mineral Processing
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