Large T Gradient in Narrow Channels

From the data here obtained for Nanofluids



 Assuming temperature difference between two neighbouring particles is very small




THE FOURIER LAW CAN BE USED

It can be seen that, for the range of channel sizes at the moment envisaged by the industrial applications

of the specific project, the average distance between nanoparticles is

much smaller than the channel size, regardless of the nanoparticle volume fraction and the nanoparticle diameter

Concluding, the linearity hypothesis between the heat flux and the temperature gradient

is still valid for nanofluid: the classical Fourier law of heat

conduction can be applied for the specific project industrial applications without modifications