Heat Transfer Enhancement Nanofluid1 INTRODUCTION Nanofluid : Nanofluid is a new kind of heat transfer medium, which disperses metal or non-metal nano powder into water, alcohol, oil and other traditional heat transfer medium, and makes it uniform, stable and highly conductive. Two parts of nanofluid: Nanoparticles: metal, oxide, carbide, nitride, carbon nanotubes and other particles. Liquid base: water-soluble or water-insoluble liquid, water, alcohol, oil and other media2 MECHANISM (1) Interac