mohsen mansouri - Department of Energy, Material and Energy Research Center (MERC)Meshkindasht, Karaj, Iran
Amirhosein Zamzamian - Department of Energy, Material and Energy Research Center (MERC)Meshkindasht, Karaj, Iran
Arya Shafiefarhood - Department of Energy, Material and Energy Research Center (MERC)Meshkindasht, Karaj, Iran
Omid Tavakoli - Department of Energy, Material and Energy Research Center (MERC)Meshkindasht, Karaj, Iran

Nanofluid is defined as conventional fluid with suspended particles at nanometer size (normally below 100 nm) in it. These fluids possess great potential for heat transfer enhancement. Some of the main issues related to nanofluids and their preparation are stability, particle sedimentation and clustering. In this study effect of parameters such as base fluid, particle size and concentration on nanofluid stability and effect of particle sedimentation through time from nanofluid preparation on its thermal conductivity have been investigated. For example the amount of thermal conductivityof sample with 3% valume fraction SiO2 in the base fluid with initial value 0/415 w/m.k is decrese to 0/365 w/m.k. Also results showed that nanofluid thermal conductivity reduction caused by particle sedimentation decrease with increase in particle size and concentration

Sedimentation, Nanoparticles, Thermal Conductivity, SiO2 Nanofluids