Recent Developments of Nanofluids

Dear Colleagues,

Recent advances in nanotechnology have allowed the development of a new category of fluids termed nanofluids. A nanofluid refers to the suspension of nanosize particles, which are suspended in the base fluid with low thermal conductivity. The base fluid, or dispersing medium, can be aqueous or non-aqueous in nature. Typical nanoparticles are metals, oxides, carbides, nitrides, or carbon nanotubes. These shapes may be spheres, disks, rods, etc. By using these additives, one can increase heat transfer coefficient and consequently enhance the heat transfer value and performance of base fluids. Some of these fluids can be considered as Newtonian fluid, but in many applications the Newtonian model is not very accurate; therefore, it has generally been acknowledged that non-Newtonian fluids exhibiting a nonlinear relationship between the stresses and the rate of strain are more appropriate in technological applications as compared to Newtonian fluids. Many industrial fluids are non-Newtonian in their flow characteristics and refer to as rheological fluids, such as slurries (china clay and coal in water, sewage sludge, etc.), multiphase mixtures (oil-water emulsions, gas-liquid dispersions, such as froths and foams, butter). Further examples displaying a variety of non-Newtonian characteristics include pharmaceutical formulations, cosmetics and toiletries, paints, synthetics lubricants, biological fluids (blood, synovial fluid, salvia), and food stuffs (jams, jellies, soups, marmalades), etc. Moreover, simulation of boundary layer flow of nanofluid is another issue of this Special Issue that has various applications in engineering and industrial disciplines. Nanofluid technology can help to develop better oils and lubricants for practical applications. Nanofluids also strengthen solar energy application like heat exchangers design, some medical applications, including cancer therapy and safer surgery by heat treatment.

Existing literature bears witness that the investigations on said topic are still scant. In order to fill this gap, researchers are invited to contribute original research and review articles in the following potential topics (see keywords below). 

Dr. Rahmat Ellahi
Guest Editor

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