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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2010, Volume 61, Issue 2,





Nicu Bors, Andra TAmas, Romulus Minea
Contributions to Rheological Fluids Flow in Modified Couette Device

Abstract:

The liquids motion in ring-shaped spaces, based on the rotation of one or both coaxial cylinders, leads to the liquid layers relative motion with velocity values between those of lateral surfaces. The friction force and the shear rate depend on the assessed revolution, cylinders geometry and liquid dynamic viscosity. The Taylor number (Ta), defined as the ratio between the centrifugal force and the viscous friction one, characterizes the flow nature and indicates the possibility of specific effects appearance (Taylor-Couette instability). Based on these reasons it was optimized the dimensioning of a modified Couette rheometer (the inner cylinder is subjected to rotational motion and the outer is setting into an elastic joint accordingly to the developed friction forces), to allow the study of medium viscosity fluids behaviour (water, aqueous solutions, ethylene glycol, mineral oils), in transient domain (60[Ta[3000). The device construction offers the possibility to view the effects that appear, as well as the functional sizes acquisition (revolution, extension force, elastic motion) using sensors and interfaces and their further processing. Keywords: rheometer, rotational motion, Taylor number


Issue: 2010, Volume 61, Issue 2
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