流体力学: オープンアクセス

Investigation of Particle Size Effect on Thermal Conductivity Enhancement of Distilled Water-Al₂o₃ Nano Fluids

Abstract

Samdhani Shaik.

Nano fluids are dispersions of high thermal conductivity nano particles during a base fluid, and offer potential to enhance thermal conductivity of it. Literature data on the effect of particle size on the thermal conductivity enhancement of nano fluids are inconsistent and limited. Hence within the present study, the effect of particle size on thermal conductivity enhancement of distilled water- Al₂O₃ nano fluid has been investigated experimentally using transient hot wire apparatus. The particle volume concentration of Al₂O₃ nano particles for mean diameter of 15 nm and 60 nm are varied between 0.1 and 3%. The enhancement within the thermal conductivity is approximately 22% and 17% for 15 nm and 60 nm particle size respectively, at 3% particle volume concentration at 30οC. These experimental results are according to the predictions from the Brownian movement based model, show that the enhancement within the thermal conductivity of the distilled water- Al₂O₃ nano fluid decreases with a rise within the particle size.