Paper presented at the 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Mauritius, 11-13 July, 2011.
Boiling heat Transfer Coefficient of 0.1 vol.% wateralumina
nanofluids and the effect of pH value of the solution
was studied. It was observed that as the pH value changed from
neutral (6.5) to acidic (5), the particle cluster size and solution
heat transfer coefficient were affected. The cluster size of the
nano-alumina fluid decreased with increasing sonicating time.
The flow behavior of the nanofluid for 1 to 4 vol.%
concentrations was studied and it was observed that these
nanofluids behaved as Newtonian and their viscosity decreased
with increasing sonicating time. The decrease in viscosity could
be attributed to the fragmentation of the nano-particles and
clusters as observed from their microstructure.