Peculiarities of Showing Capillary Effects by Electrorheological Fluids

Abstract

Experimentally the filling of a single capillary-condenser in the transverse to the gradient of electrical field current was studied. ERF on the basis of polymethyloxane fluids or mineral oil that consist of activated particles of SiO 2 with the weight concentration 5-30% were observed. The dependence of position of meniscus, its crookedness and the height of near-wall layer on the tension of electrical influence and time were measured. The variants of usage of homogeneous and gradient on the axis of the capillary electrical fields were studied. In the experiments consolidation of the middle area of meniscus and lengthening of its near-wall area and also the change of the speed of its filling while the intensity of electrical influence increased was found.

Electro-capillary effects in capillary filling dynamics of electrorheological fluids

“…We attempt to compare our theoretical results with previously reported experiment on capillary filling of ERFs, performed in 35 . The experiments of Korobko et.…”

“…We attempt to compare our theoretical results with previously reported experiments on the capillary filling of ERFs, performed in ref. 35. The experiments of Korobko et al 35 were executed with transformer oil as the liquid medium whose density, dielectric constant and surface tension are r c = 880 kg m À3 , e c = 2.5 and s = 27 mN m À1 , respectively.…”

“…35. The experiments of Korobko et al 35 were executed with transformer oil as the liquid medium whose density, dielectric constant and surface tension are r c = 880 kg m À3 , e c = 2.5 and s = 27 mN m À1 , respectively. 35 The conductivity of the continuous phase is found from ref.…”

“…32 Although such models cannot capture the meniscus shape explicitly, their predictions have been shown to agree well with experiments. 25,33,34 Despite the fact that the majority of the literature on capillary action is focused on Newtonian fluids, capillary filling dynamics of non-Newtonian fluids has also been studied by a number of researchers, 21,27,34,35 due to their practical applications in fluids such as polymer solutions and biofluids. 19,26,27,36 Experiments on the capillary filling of ERFs 35 have also been executed in recent years, and demonstrate several non-intuitive trends in the meniscus displacement characteristics.…”

An experimental study of electrorheological fluid flow through a packed bed of glass beads

“…The materials can change from Newtonian to viscoelastic behavior and can develop yield stress behavior. ER fluids have been extensively studied including pioneering works by Gorodkin and co-workers (Korobko et al 1996(Korobko et al , 2005Gorodkin et al 1981;Shul'man et al 1971;Korobko et al 1991). ER fluids typically consist of non-conductive micron or submicron particles dispersed in a non-conductive liquid phase.…”