Controlling the Heat Transfer by Controlling the Composition of A Cooling Nano-fluid

Khaled M. K. Pasha

1)  the first part of the present work is an experimental investigation of the convective heat transfer from a circular tube at constant wall heat flux. The working Nanofluid in these experiments is composed of alumina Nanoparticles, which are dispersed in  water at concentrations of (0.0 %, 0.3 %, 0.5%, 0.7% and 1%), respectively, and this Nanofluid flows in a hot tube at two values of Reynolds number,  Re_nf , 8676 and 13000.

2) the second part is a repetition of  the experiments of the first part, after Equipping the test rig with a control unit, which is designed to control the concentration of Nanoparticles in the base fluid, as required. The results from the two parts are compared as a reliability check for the designed control unit. The present work is intended to be a step towards a future work, in which, the experimental data of the variation of Nusselt number with the Nanoparticle concentration are fed  to this control unit, in order to manage the thermal behavior of the large engine cooling systems, in order to meet the requirements of a specific application.

The results of the experiments showed an accepted agreement with the previous work, and the Nusselt number is possible to be effectively controlled, using the designed control unit.