An Elastorelaxometer for Large Reversible Deformation of Elastomeric Systems and Polymer Solutions

1961 ◽  
Vol 34 (1) ◽  
pp. 165-175 ◽  
Author(s):  
A. A. Trapeznikov
Keyword(s):  
Polymer Solutions ◽  
Coaxial Cylinder ◽  
Moment Of Inertia ◽  
Colloidal Systems ◽  
Elastic Recoil ◽  
Elastic Deformations ◽  
Yield Value ◽  
New Instrument ◽  
Colloidal Gel ◽  
Minimum Moment

Abstract 1. A new instrument, the elastorelaxometer (based on the coaxial-cylinder principle) has been developed, for studies of large high-elastic deformations in relaxing colloidal gel systems and polymer solutions. 2. The effects of the following were investigated : a) width of the gap between the cylinders ; b) moment of inertia of the cylinder (with rapidly relaxing colloidal systems, cylinders of the minimum moment of inertia must be used) ; c) nature of the liquid in the bottom of the cylinder ; d) nature of the motion of the inner cylinder at different ultimate deformations. 3. Values of elastic recoil εc for different predetermined deformations ε have been determined in dilute aluminum naphthenate gels in decalin. It is shown that εc passes through a maximum, associated with transition beyond the yield value of the structure, with increase of ε. It is shown that εc can reeah 6000% in 2% gels.

Stability of a Rigid Body With an Oscillating Particle: An Application of MACSYMA

1985 ◽  
Vol 52 (3) ◽  
pp. 686-692 ◽  
Author(s):  
L. A. Month ◽  
R. H. Rand
Keyword(s):  
Angular Velocity ◽  
Rigid Body ◽  
Classical Problem ◽  
Moment Of Inertia ◽  
Model Parameters ◽  
Stability Chart ◽  
The Stability ◽  
Transition Curves ◽  
Minimum Moment ◽  
Small Angular Velocity

This problem is a generalization of the classical problem of the stability of a spinning rigid body. We obtain the stability chart by using: (i) the computer algebra system MACSYMA in conjunction with a perturbation method, and (ii) numerical integration based on Floquet theory. We show that the form of the stability chart is different for each of the three cases in which the spin axis is the minimum, maximum, or middle principal moment of inertia axis. In particular, a rotation with arbitrarily small angular velocity about the maximum moment of inertia axis can be made unstable by appropriately choosing the model parameters. In contrast, a rotation about the minimum moment of inertia axis is always stable for a sufficiently small angular velocity. The MACSYMA program, which we used to obtain the transition curves, is included in the Appendix.

?Elastic recoil? in polymer solutions as a function of concentration

1971 ◽  
Vol 20 (2) ◽  
pp. 135-136
Author(s):  
G. V. Vinogradov ◽  
L. V. Timkova ◽  
A. S. Morozov
Keyword(s):  
Polymer Solutions ◽  
Elastic Recoil

Drag Reduction in Laminar Flow Between Two Vertical Coaxial Cylinders

1999 ◽  
Vol 121 (3) ◽  
pp. 541-547 ◽  
Author(s):  
Keizo Watanabe ◽  
Takashi Akino
Keyword(s):  
Drag Reduction ◽  
Polymer Solutions ◽  
Flow Behavior ◽  
Acrylic Resin ◽  
Coaxial Cylinder ◽  
Newtonian Fluids ◽  
Basic Material ◽  
Water Repellent ◽  
Coaxial Cylinders ◽  
Moment Coefficient

Laminar drag reduction has been shown for the flow of a Newtonian fluid in the space between two vertical coaxial cylinders. Experiments were carried out to measure the torque of a bob with a highly water-repellent wall to clarify the effect of the contact surface of the bob on the flow behavior. The basic material of the highly water-repellent wall is fluorine alkane modified acrylic resin with added hydrophobic silica, and the contact angle of the wall is about 150 degree. The radius rations of the bob were 0.932 and 0.676. Test fluids were Newtonian aqueous solutions of 60, 70, and 80 wt% glycerin and polymer solutions. The maximum drag reduction ratio was about 12% for 80 wt% glycerin solution at a radius ratio of 0.932. The moment coefficient of the coaxial cylinder in Newtonian fluids was analyzed for fluid slip, and it was shown that the analytical results agreed well with the experimental data. For the case of non-Newtonian fluids, the fluid slip velocity of polymer solutions is not proportional to the shear stress and the relationship is approximated by power-law equations.

Falling coaxial cylinder viscometer for polymer solutions

1976 ◽  
Vol 20 (6) ◽  
pp. 1467-1473 ◽  
Author(s):  
K. K. Chee ◽  
K. Sato ◽  
A. Rudin
Keyword(s):  
Polymer Solutions ◽  
Coaxial Cylinder ◽  
Cylinder Viscometer

scholarly journals The Peculiarities of Oil Displacement in the Process of Oscillating Injection of Polymer Solution into the Bed with Layered Heterogeneity

2019 ◽  
pp. 42-50
Author(s):  
V. G. Pogrebnyak ◽  
І. V. Perkun
Keyword(s):  
Polymer Solution ◽  
Polymer Solutions ◽  
Dissipative Function ◽  
Filtration Flow ◽  
Elastic Deformations ◽  
Porous Bed ◽  
Water Solutions ◽  
Oil Displacement ◽  
Displacement Mode ◽  
Hydrodynamic Field

The authors study the filtration flow of polyethylene oxide (PEO) water solutions of molecular weights 4∙106 and 6∙106 within the concentration range from 0 to 0.05% when exposed to an oscillating hydrodynamic field. Photographs characterizing the displacement of oil (with a viscosity of 10 to 50 mPa. s) with PEO water solutions from model porous formations with layered heterogeneity have been obtained. They have made it possible to specify the effectiveness of different oil displacement modes.  It is shown that pumping a polymer solution into porous heterogeneous strata, while exposing it to oscillating hydrodynamic field, proved to yield a higher oil displacement ratio, as compared with a stationary oil displacement mode. The authors find out the conditions providing the positive influence on elastic deformations effects in the process of enhanced oil recovery by using polymer solutions. If elastic deformations take place, the filtration flow of polymer solutions should be carried out in the oscillating mode, whereas the frequency of the oscillating effect on the filtration flow should correspond to the dissipative function maximum. The stated results of the polymer solution flow research, under model conditions of a porous bed, have confirmed the nonlinearity mechanism of the polymer solutions filtration flow. In essence, the molecular and macromolecular non-linearity mechanism of the polymer solutions filtration flow means that in a porous medium under the influence of quasi-regular longitudinal velocity gradients, there arise self-sustained oscillations of reversible macromolecular deployment; the deployed macromolecules, in turn, influence the structure of the filtration flow, both on the molecular and macromolecular levels. Deformation oscillations of macromolecules and dissolubility of dynamic macromolecular structures formed under the influence of tensile currents result in the energy dissipation increase and the filtration flow nonlinearity. The nonlinearity of polymer solutions filtration flow ensures the alignment of the frontal advance of the polymer solutions within a porous bed with a layered heterogeneity and, consequently, higher oil displacement efficiency.

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