RHEOLOGICAL FEATURES OF WATER FLOW IN MICROCRACKS

Rheophysical phenomena during the fl ow of a viscous fl uid (water) in diff erently opened fl at microcracks have been studied. The role of the electrokinetic factor in the manifestation of the nonlinear rheological eff ect in a water fl ow in a microchannel model — the transformation of a Newtonian fl uid into a non-Newtonian one — is examined experimentally. Water fl ow curves were recorded and, based on the Bingham model, its rheological parameters were assessed for diff erently opened microcracks. It has been established that the non-Newtonian nature of water in microcracks is determined mainly by the value of the electrokinetic potential of the fl ow, and by reducing it, using antistatic additives, the nonlinear nature of the fl ow can be weakened signifi cantly.
Rheophysical phenomena during the fl ow of a viscous fl uid (water) in diff erently opened fl at microcracks have been studied. The role of the electrokinetic factor in the manifestation of the nonlinear rheological eff ect in a water fl ow in a microchannel model — the transformation of a Newtonian fl uid into a non-Newtonian one — is examined experimentally. Water fl ow curves were recorded and, based on the Bingham model, its rheological parameters were assessed for diff erently opened microcracks. It has been established that the non-Newtonian nature of water in microcracks is determined mainly by the value of the electrokinetic potential of the fl ow, and by reducing it, using antistatic additives, the nonlinear nature of the fl ow can be weakened signifi cantly.
Author:  F. G. Veliev, M. A. Mamedova, A. R. Aslanova
Keywords:  microcrak, microcrack opening, fl ow curves, double electric layer, streaming potential, antistatic additives, ultimate shear stress, structural viscosity
Page:  663