Rheological behavior of water and ethylene glycol based nanofluids containing oxide nanoparticles

Publication date: Available online 20 June 2018Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): A.V. Minakov, V.Ya. Rudyak, M.I. PryazhnikovAbstractThe paper presents the results of experimental study of rheological behavior of nanofluids based from consideration of several tens of nanofluids based on water, ethylene glycol and engine oil, containing particles of different oxides and diamond. The sizes of nanoparticles ranged from 5 to 150 nm, while their volume concentration ranged from 0.25 to 8%. At that, no dispersants were used when preparing tested nanofluids. It is shown that in some cases, when increasing nanoparticle concentration, rheological behavior of nanofluids becomes non-Newtonian and is well described by power-law fluid models or Herschel–Bulkley fluids. The influence of nanoparticle size and material, as well as the nature of the base fluid on the rheological behavior of nanofluids have been studied.Graphical abstractViscosity (a) and shear stress (b) of ethylene glycol-based nanofluid containing particles of Al2O3 versus shear rate.

Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - July 11, 2018 Category: Chemistry Source Type: research