“…On the other hand, b f and b C are the coefficients of thermal expansion of the fluid and of the solid, respectively, q f and q C are the densities of the fluid and of the solid fractions, respectively, while q nf is the viscosity of the nanofluid, a nf is the thermal diffusivity of the nanofluid, and ðqC p Þ nf is the heat capacitance of the fluid, which are defined as (Abbasi [37,38])…”