Akademik Veri Yönetim Sistemi
4th International Symposium on Advanced Materials and Nanotechnology, Batu-Sembilan-Cheras, Malezya, 1 - 03 Aralık 2020, ss.232-237
There
has been a growing interest in developing new fluids aiming to increase the
efficiency of heat transfer systems. However, specifically-designed fluids were
often too expensive. A good approach was incorporation of phase change
materials (PCM) into the fluids. Yet, it brought about particular problems
often associated with the miscibility of PCM with carrier fluids and with
meeting the increased pumping power needs. With rapidly developing
nanotechnology and introduction of new methods, micro-/nano-encapsulated PCM
(ePCM) now seems to offer a solution. Thanks to encapsulation, the phases are
always separated from each other during the heat transfer process, by which the
advantages associated with two-phase flow at the micro level can be achieved
and the advantages of single phase fluid at the macro level can be exploited.
Volumetric slurry concentrations below 25% can be assumed to be Newtonian and
under ideal conditions, the Nusselt number of the ePCM slurry is 1.5 to 4 times
higher than that of the single phase flow. In this study, the use of ePCM
slurries as heat transfer fluids and characterization of ePCM slurry as a
working fluid in a heat transfer system is addressed.