Experimental study of heat transfer of Alumina/water nanofluid in a pilot scale shell and tube heat exchanger

فاقد چكيده فارسي

In the present work, the effect of nano particles on the enhancement of heat transfer has been investigated. This effect can be due to the higher conductivity of these particles and their Brownian motion in the fluid. Heat transfer of Bohemit(AlO(OH))/Water nanofluids at various concentrations has been studied experimentally in a pilot scale shell and tube heat exchanger. Effect of concentration, temperature, and volume flow rate of the nanofluid as well as volume flow rate of water was investigated in this study. Different concentration of nanofluid including 0.35, 0.7, and 1.4 % wt were considered in the experiment. Experimental results showed that the overall heat transfer coefficient was increased as the concentration, temperature and flow rate of nanofluid and the flow rate of water increased. As an instance, enhancement of 14.01, 14.89 and 22.92 % for the overall heat transfer coefficient was obtained for fractions of 0.35, 0.70 and 1.40 %wt, respectively.