Mixed Convection Heat Transfer of Copper Oxide-Heat Transfer Oil Nanofluid in Vertical Tube
In this paper, experiments were conducted to investigate the heat transfer of Copper Oxide-Heat Transfer Oil (CuO-HTO) nanofluid laminar flow in vertical smooth and microfin tubes as the surface temperature is constant. The effect of adding the nanoparticle to base fluid and Richardson number on the heat transfer enhancement is investigated as Richardson number increases from 0.1 to 0.7. The experimental results demonstrate that the combined forced-natural convection heat transfer rate may be improved significantly with an increment of mass nanoparticle concentration from 0% to 1.5%. In this experiment, a correlation is also proposed to predict the mixed convection heat transfer rate of CuO-HTO nanofluid flow. The maximum deviation of both correlations is less than 14%. Moreover, a correlation is presented to estimate the Nusselt number inside vertical smooth and microfin tubes as Rayleigh number is between 2´105 and 6.8´106 with the maximum deviation of 12%.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3607789Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 855
 Lee S., Choi S.U.S., Li S., J.A. 1999. Eastman, Measuring thermal conductivity of fluids containing oxide nanoparticles. Journal Heat Transfer 121 (2): 280,289.
 He, Y., Jin, Y., Chen, H., Ding, Y., Cang, D., Lu, H. 2007. Heat transfer and flow behavior of aqueous suspensions of TiO2 nanoparticle (nanofluid) flowing upward through a vertical pipe”, International Journal Heat and Mass Transfer 50(11,12): 2272,2281.
 Akbarinia, M., Behzadmehr, A., Shahraki, F., 2008. Fully developed mixed convection in horizontal and inclined tubes with uniform heat flux using nanofluid. International Journal Heat Fluid Flow 29(2): 545,556.
 Mirmasoumi, S., Behzadmehr, A. 2012. Effect of nanoparticle mean diameter on the particle migration and thermo-hydraulic behavior of laminar mixed convection of a nanofluid in an inclined tube. Heat and Mass Transfer 48(8): 1297,1308.
 Momin, G.G. 2013. Experimental investigation of mixed convection with water-Al2O3 and hybrid nanofluid in incline tube for laminar flow. International Journal Scientific Technology Research 2 (1):195,202.
 Guo, S-P., Feng, Z-z., Fang, Z-c., Li,W., Xu, J-L., Jiang, P-x. 2013. Improved correlations for counting the effect of natural convection on laminar flow of nanofluids. Proceeding of the Asme 2013 Summer Heat Transfer Conference (HT2013). July. Minneapolis.USA.
 Pirhayati, M., Akhavan-Behabadi M.A., Khayat M. (2014). Convection heat transfer of oil based nanofluid inside a circular tube. International Journal Engineering Transaction: B. 27(2): 341,348.
 C.C. Eubank, W.S. Proctor, Effect of natural convection on heat transfer with laminar flow in tubes, M.S. Thesis, Massachusetts Institute of Technology. Boston, 1951.