Experimental study of convective heat transfer and pressure drop of TiO2/water nanofluid

• Published in: International communications in heat and mass transfer Vol. 39; no. 3; pp. 456 - 462
• Main Authors: Kayhani, M.H., Soltanzadeh, H., Heyhat, M.M., Nazari, M., Kowsary, F.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.03.2012; Elsevier
• Subjects: Applied sciences; Chemistry; Colloidal state and disperse state; Condensed matter: structure, mechanical and thermal properties; Convective and constrained heat transfer; Convective heat transfer; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fluid dynamics; Fluid flow; Functionalized TiO2; Fundamental areas of phenomenology (including applications); General and physical chemistry; Heat transfer; Nanocomposites; Nanofluids; Nanomaterials; Nanostructure; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Physics; Pressure drop; Theoretical studies. Data and constants. Metering; Thermal properties of condensed matter; Thermal properties of small particles, nanocrystals, nanotubes; Titanium dioxide; Turbulence; Turbulent; Turbulent flow; Convective heat transfer; Turbulent; Pressure drop; Functionalized TiO2; Nanofluids; Water; Turbulent flow; Nusselt number; Nanoparticle; Nanofluid; Instrumentation; Experimental study; Titanium oxide; Convection; Heat transfer
• ISSN: 0735-1933; 1879-0178
• DOI: 10.1016/j.icheatmasstransfer.2012.01.004

In this paper, an experimental study of convective heat transfer and pressure drop of turbulent flow of TiO2-water nanofluid through a uniformly heated horizontal circular tube has been performed. The spherical TiO2 nanoparticles with a nominal diameter of 15nm are functionalized by a new chemical treatment and then dispersed in distilled water to form stable suspensions containing 0.1, 0.5, 1.0, 1.5 and 2.0% volume concentrations of nanoparticles. Results indicate that heat transfer coefficients increase with increasing the nanofluid volume fraction and it is not changed with altering the Reynolds number. The enhancement of the Nusselt number is about 8% for nanofluid with 2.0% nanoparticle volume fraction at Re=11,800.