The effect of particle concentration on Cooling of a circular horizontal surface using nanofluid jets

Journal Article

Zeitoun, O. . 2013

• Magazine \ Newspaper: Nanoscale and Microscale Thermophysical Engineering
• Volume Number: 17
• Pages: 154–171

Publication Abstract

Experimental investigation is made to study the heat transfer between a vertical round alumina (Al2O3) nanofluid jet and a horizontal heated circular disk.   Different jet flow rates, jet diameters, and nanoparticles concentration are used. Water is used as liquid reference in the current investigation since it is the base fluid of the used nanofluid. Two different nanoparticles concentration 6.6 and 10% by mass are used in the current investigation. The effect of nanoparticles concentration on the heat transfer is investigated by plotting Nusselt number versus the jet Reynolds number. Results have shown improvement of heat transfer presented by an increase in Nusselt number for the same Reynolds number as the concentration increases.  The data is less sensitive to change with jet diameter Di and jet velocity Vi. Finally, the data is collapsed on one curve when Peclet number Pei is used for each concentration.