Extension of the Temperature and Shear Rate Range for Polymer Containing Lubricants Using the Cannon HTHS Capillary Viscometer

1993 ◽  
Author(s):  
V. Bala ◽  
E. E. Klaus ◽  
J. L. Duda ◽  
V. Palekar
Keyword(s):  
Shear Rate ◽  
Capillary Viscometer ◽  
Rate Range

A new capillary viscometer for measurements on small blood samples over a wide shear rate range

2016 ◽  
Vol 4 (2-3) ◽  
pp. 295-297
Author(s):  
Shunichi Usami ◽  
Walter Reinhart ◽  
Stuart Danoff ◽  
Shu Chien
Keyword(s):  
Shear Rate ◽  
Capillary Viscometer ◽  
Blood Samples ◽  
Rate Range

Estimation of Red Cell Deformability Based on Flow Curve of Whole Blood in the Higher Shear Rate Range.

2001 ◽  
Vol 27 (2) ◽  
pp. 228-235
Author(s):  
Shinichi Ookawara ◽  
Akihisa Yano ◽  
Kohei Ogawa ◽  
Koichi Taniguchi
Keyword(s):  
Shear Rate ◽  
Whole Blood ◽  
Flow Curve ◽  
Red Cell ◽  
Cell Deformability ◽  
Red Cell Deformability ◽  
Rate Range

GRAFT COPOLYMERS OF STYRENE AND METHYL METHACRYLATE: PART II: VISCOSITY BEHAVIOR

1956 ◽  
Vol 34 (8) ◽  
pp. 1027-1036 ◽  
Author(s):  
M. H. Jones
Keyword(s):  
Shear Rate ◽  
Methyl Methacrylate ◽  
Graft Copolymers ◽  
Free Fall ◽  
Capillary Viscometer ◽  
Linear Polymers ◽  
Viscosity Behavior ◽  
Shear Gradient ◽  
Constant Shear Rate ◽  
Made In

A study of the viscosity behavior of the graft copolymers described in Part I has been made with dilute solutions in benzene at 25 °C. Although the slope constants of the Huggins equation increase with the frequency of branching when measurements are made in a capillary viscometer under 'free fall' conditions, this is shown to be attributable to the dependence of viscosity on shear gradient. At a constant shear rate, the Huggins k′ values approximate to those of linear polymers. It is suggested that the marked increase in viscosity observed with decreasing shear rate for the graft copolymers is due to molecular entanglement.

Further remarks on falling coaxial cylinder with wide shear rate range

1978 ◽  
Vol 17 (3) ◽  
pp. 312-313
Author(s):  
A. Rudin ◽  
C. K. Ober ◽  
K. K. Chee
Keyword(s):  
Shear Rate ◽  
Coaxial Cylinder ◽  
Rate Range

Development of Viscosified Acid-Surfactant Solutions for Oilfield Applications: Rheological Properties

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Lionel Talley Fogang ◽  
Muhammad Shahzad Kamal ◽  
Mohamed Mahmoud
Keyword(s):  
Shear Rate ◽  
Acid Solution ◽  
Rheological Properties ◽  
Calcium Chloride ◽  
Elastic Properties ◽  
Salt Concentration ◽  
Shear Thinning ◽  
Rate Range ◽  
Shear Rates ◽  
Surfactant Solutions

Abstract Viscosified acids are desired in several oilfield applications such as in acid diversion and acid fracturing operations. The study aimed to delineate the rheological properties of a novel amine type surfactant and viscosified acid-surfactant solutions. The steady shear and dynamic rheological properties were evaluated by varying the surfactant, acid, and salt concentration. Such a study is required to gauge the suitability of the viscosifying agent in acid stimulation jobs. The surfactant solutions without acid showed shear-thinning behavior, whereas those with acid showed a Newtonian plateau over a wide shear rate range before undergoing shear thinning. This means that over a wide shear rate range, the acid-surfactant solutions become independent of applied shear. At low shear rates, the viscosity of the surfactant was higher compared with the surfactant-acid solution. However, at high shear rates, the viscosity of the surfactant was lower compared with the viscosity of the surfactant-acid solution. There was an optimal salt concentration that improved the viscosity and elasticity of the acid-surfactant solutions. Thus, the rheology of the surfactant solution can be improved by adding both acid and salt. The elastic properties of acid-surfactant solutions were also better compared with the elastic properties of pure surfactant. The addition of acid improved the elastic properties of the surfactant solutions. Constant viscosity over a range of shear rate is a suitable application for acid fracturing operations in which the acid leak-off will be minimal due to the high viscosity. Also, brines in most of the carbonate formation consist of high loading of calcium chloride which was found to have a positive effect on the viscosity. Increasing the calcium chloride leads to an increase in viscosity, and then subsequently decreases the viscosity. This shows that the acid and salt concentration plays a role in modifying the rheological properties of the surfactant solutions.

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