Nanotechnology has been widely used in industry since
materials with sizes of nanometers have clear physical
and chemical properties. Nano-scale particle added fluids
are called as nanofluid which is firstly utilized by Choi. 1
Nanofluids are a new kind of heat transfer fluids containing
a small quantity of nano-sized particles (usually less than
100 nm) that are uniformly and stably suspended in a liquid.