*2.3. Thermophysical Properties*

The present investigation is concerned with the development of a thin film of liquid on a rotating disk with different metallic particles that require effective thermo-physical properties of nanofluids and nanoparticles. Two distinctive models proposed by Khanafer and Vafai [41] were chosen to analyze the density and specific heat of the nanofluids; whereas to estimate the thermal conductivity and viscosity of fluids, the thermophysical model [42] is utilized. In view of the thermophysical model in the presence of multi fluids containing two different types of nano-sized metallic particles, the realistic properties were developed as follows:
