RHEOLOGICAL PROPERTIES OF WATER- AND ETHYLENE-GLYCOL-BASED NANOFLUIDS WITH SINGLE-WALLED CARBON NANOTUBES

An experimental study has been made of the viscosity and rheology of water- and ethylene-glycol-based nanofl uids with single-walled carbon nanotubes, and also of their dependence on temperature. The mass concentration of the nanotubes ranged from 0.05 to 1%. Polyvinyl pyrrolidone and sodium dodecyl benzenesulfate were used as dispersants. The dimensions of the single-walled nanotubes were determined by the method of dynamic light scattering. Preliminary study of the viscosity and rheology of basic fl uids has shown that they are Newtonian fl uids. However, all the studied fl uids turned out to be pseudoplastic non-Newtonian fl uids. It has been established that with growth in the concentration of nanotubes in a fl uid, its index decreases, and the consistency parameter increases. With increase in the temperature of a nanofl uid, its viscosity decreases. The change in the temperature of a nanofl uid exerts an infl uence on its rheology: the consistency parameter of the nanofl uid increases, and its index decreases, and this infl uence increases as the concentration of nanotubes in the nanofl uid grows. Ultrasonic treatment of the nanofl uid leads to a partial degradation of dispersants in it and to an increase in its viscosity. Measures on restoring the properties of long-stored nanofl uids have been discussed
   
Author:  V. Ya. Rudyak, D. S. Tret′yakov
Keywords:  nanofl uid, single-walled carbon nanotubes, viscosity, rheology, dispersants
Page:  1208