Moghadassi - Chemical Eng. Dept. of Arak University, Shariati st., Arak
Barati - Chemical Eng. Dept. of Arak University, Shariati st., Arak
Masoud Hosseini - Chemical Eng. Dept. of Arak University, Shariati st., Arak
Khaleghi - Chemical Eng. Dept. of Arak University, Shariati st., Arak

Nanofluids, i.e. fluid suspensions of nanometer- sized solid particles and fibers, have been proposed as a route for surpassing the performance of heat transfer liquids currently available. Recent experiments on nanofluids have indicated significant increases in thermal conductivity compared with liquids without nanoparticles or larger particles, strong temperature dependence of thermal conductivity, and significant increases in critical heat flux in boiling heat transfer. The suspended metallic or nonmetallic change the transport properties and heat transfer characteristics of the base fluid.Furthermore,nanofluids are expected to be ideally suited in practical applications as their use incurs little or no penalty in pressure drop because the nanoparticls are ultrafine.The aim of this review is to summarize recent developments in research on the heat transfer characteristics of nanofluid for the purpose of suggesting some possible reasons why the suspended nanoparticles can enhance the heat transfer of conventional fluids and to provide a guide line or perspective for future research.

Nanofluid, Nanoparticles, Suspension, Heat transfer enhancement