RHEOLOGICAL CHARACTERIZATION OF A NON-NEWTONIAN FLUID USING A CAPILLARY MICRORHEOMETER
A.S. Lobasov, A.V. Minakov
Siberian Federal University, Krasnoyarsk, Russia
Keywords: microchannel, non-Newtonian fluid, rheometer, rheology, numerical simulation, hydrodynamic friction coefficient, CFD method
Abstract
A numerical simulation of non-Newtonian fluid flows with various rheological parameters in a straight microchannel is performed to assess its suitability as a rheometer. Calculations are performed using a rectangular microchannel that is 40 μm high, 400 μm wide, and 13 mm long. A power-law fluid with a consistency index ranging from 0.006-0.6 Pa·sn and a flow index ranging from 0.4 to 0.8 is considered. The Reynolds numbers range from 1 to 100. Based on the simulation data, a correlation is obtained for the constant in the expression for the friction coefficient, and equations are derived for calculating the rheological coefficients of the power-law model from the measured flow rate and pressure drop.
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