Experimental Investigation of nanofluid heat transfer in a square cross-sectional duct

Abstract

English version Forced convective heat transfer of two different nanofluids including AL$_2$O$_3$-water and CuO-water in laminar flow through square cross section duct under constant heat flux has been investigated. The Nusselt number and average convective heat transfer coefficient for different nanoparticles concentrations as a function of Peclet number have been analyzed. AL$_2$O$_3$-water nanofluid with 0.2, 0.5, 1.0, 1.5, 2.0 and 2.5 percent volume fractions has been tested. The maximum enhancement of convective heat transfer coefficient for each of the above mentioned concentrations was 7, 10, 13, 18, 22, 27 percent, respectively. Also, CuO-water nanofluid was tested at 0.1, 0.2, 0.5, 0.8, 1.0 and 1.5 percent volume fractions and the results show that the maximum enhancement of convective heat transfer coefficient for each concentration was 8, 10, 14, 16, 19, 21 percent, respectively.