Transient rheology in a new type of Couette apparatus.

Ravey, Jean-Claude; Dognon, M.; Lucius, M.

doi:10.1007/bf01523854

Cited by 8 publications

(3 citation statements)

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“…Typical values of the gap are r 2-rl = 1 mm, and rl = 14 mm, h = 75 mm, and I 0 = 500.10 -7 SI units. As a result, the characteristic times 0 measured during the rheometer operation are about 5.10-2t/-~ s. Details concerning the calculation of this characteristic time may be found in reference [1] (for example, Eq. (2)).…”

Section: Description Of the Viscometermentioning

confidence: 99%

“…Let ~ be the angular velocity of the magnetic induction B (typically, t2 is 120 rpm), and co the velocity of the rotor; then we have shown that for all the practical experimental conditions (viscosity of the fluid less than one poise, B in the range 500-900 gauss) the rotational torque is proportional to B 2 (0-co). Two constants a and b allow to describe any motion, and they are expressed in terms of the structural parameters of the rheometer as follows [1,2]:…”

Section: Description Of the Viscometermentioning

confidence: 99%

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Transient rheology in a new type of couette apparatus. Application to blood

1989

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By using our new air-bearing viscometer different types of transient flow can be studied; in the present work this viscometer was specifically applied to non-Newtonian blood suspensions. To observe the influence of both the aggregation and the deformation of red blood cells (RBCs), different concentrations of fibrinogen and dextran were used: the suspended RBCs were simply washed or rigidified with diamide. From the data three rheological parameters were determined, two of which are relative to the behavior at low and at high shear gradients, respectively. Their values were related to the theory of Taylor, and the internal viscosity of RBCs was estimated to be around 3 cp.

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Section: Description Of the Viscometermentioning

confidence: 99%

Section: Description Of the Viscometermentioning

confidence: 99%

Transient rheology in a new type of couette apparatus. Application to blood

1989

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“…Ting [19] discussed unsteady Couette flows of second-order fluids with constant tangential surface force. Considering inertia of rotation, Ravey et al [20] studied the transient motions of rotor based on an air-bearing viscometer filled with Newtonian fluids.…”

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Transient stage comparison of Couette flow under step shear stress and step velocity boundary conditions

Chen

Liu

Zhang

et al. 2016

International Communications in Heat and Mass Transfer

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Couette flow has been widely used in many industrial and research processes, such as viscosity measurement. For the study on thixotropic viscosity, step-loading, which includes (1) step shear stress and (2) step velocity conditions, is widely used. Transient stages of Couette flow under both step wall shear stress and step wall velocity conditions were investigated. The relative coefficient of viscosity was proposed to reflect the transient process. Relative coefficients of viscosity, dimensionless velocities and dimensionless development times were derived and calculated numerically. This article quantifies the relative coefficients of viscosity as functions of dimensionless time and step ratios when the boundary is subjected to step changes. As expected, in the absence of step changes, the expressions reduce to being functions of dimensionless time.When step wall shear stresses are imposed, the relative coefficients of viscosity changes from the values of the step ratios to their steady-state value of 1. but With step-increasing wall velocities, the relative coefficients of viscosity decrease from positive infinity to 1. The relative coefficients of viscosity increase from negative infinity to 1 under the step-decreasing wall velocity condition.During the very initial stage, the relative coefficients of viscosity under step wall velocity conditions is further from 1 than the one under step wall shear stress conditions but the former reaches 1 faster. Dimensionless development times grow with the step ratio under the step-rising conditions and approaches the constant value of 1.785 under the step wall shear stress condition, and 0.537 under the step wall velocity condition respectively. The development times under the imposed step wall shear stress conditions are always larger than the same under the imposed step wall velocity conditions.

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A Guide to Literature Related to the Taylor-Couette Problem

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1992

NATO ASI Series

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Transient rheology in a new type of Couette apparatus.

Cited by 8 publications

References 1 publication

Transient rheology in a new type of couette apparatus. Application to blood

Transient rheology in a new type of couette apparatus. Application to blood

Transient stage comparison of Couette flow under step shear stress and step velocity boundary conditions

A Guide to Literature Related to the Taylor-Couette Problem

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