The Effect of Particle Concentration on Cooling of a Circular Horizontal Surface Using Nanofluid Jets

Here we report an experimental study of the heat transfer between a nanofluid jet and a horizontal heated circulate disk. The nanofluid jet has circular cross section and includes Al2O3 nanoparticles and water as the matrix fluid. The measurements include varying flow rates (0.0060.075 kg/s) and jet diameters (3.98.2 mm) and nanoparticle concentrations (6.6 and 10% by mass). The Nusselt number increases for a given Reynolds number for increasing particle concentration, and this sensitivity is larger than that achieved through the variation in jet diameter and velocity explored in this study. Finally, the data are collapsed on one curve where the Peclet number is used for each concentration.