Influence of Nanoparticle Type, Size and Weight on Migration Properties of Nanorefrigerant

摘要

Refrigerant-based nanofluids are termed as nanorefrigerants, which are capable of improving the performance of refrigeration systems. Refrigerants act as coolants due to their low boiling temperature. Therefore, the condition of nanoparticles during this phase change needs to be clarified. In this paper the migration properties of nanoparticles during pool boiling of a nanorefrigerant have been experimentally studied. The effects of nanoparticle type, size and weight on the migration of nano-sized particles have been investigated. Al_2O_3 and TiO_2 particles, each with two different average diameters, were used with R141b refrigerant as the base fluid. Experimental results show that migrated mass of nanoparticles increases with the increase of initial mass of nanoparticles and sizes of nanoparticles as well. However, migration of nanoparticles decreases with the increase of the density of nanoparticles. Hence, migration properties of nanoparticles have a notable relationship with the distribution of nano-sized particles.