“Nanofluids”, as we know it is a colloidal mixture consisting of nano-sized particles which are dispersed in a fluid medium (base fluid like water or EG). These nanofluids shows enhanced thermo-physical properties which can be used in thermal systems for higher heat transfer allpications.
Surface tension is the surface energy per unit area. It dominates the transportation of the liquid and shows a significant role in heat transfer.
Does the nanofluids surface tension plays any role for heat transfer enhancement with variation of particle size or concentration.
If the nanoparticles are surface active so that they acummulate in the interface, they can change the interfacial tension of the fluid. Colloidal particles are known to have this effect. Changes interfacial tension can change wetting properties of the fluid, and so might have an effect on heat transfer especially if interfaces are involved in the heat transfer process. For example boiling film drying etc.
Thanks sir for the answer,,,,, Does the effect is so significant that we should consider while modeling for effective thermal conductivity of nanofluids and does surface tension depends on shape and size of nanoparticles?
A good place to start to understand the impact of particles in an interface is the paper by T. Okubo, "Surface tension of structured colloidal suspensions of polystyrene an silica spheres at the air water interface, JCIS, 171, 55-62, 1995. And for a more recent reference, check out the monograph: " Colloidal Particles at liquid interfaces", by B. B. Brinks and T. S. Horozov, Cambridge University Press, 2006
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