Anomalous Viscosity of Critical Mixtures and Its Dependence on Velocity Gradient

1968 ◽  
Vol 48 (12) ◽  
pp. 5326-5329 ◽  
Author(s):  
Robert Sallavanti ◽  
Marshall Fixman
Keyword(s):  
Velocity Gradient ◽  
Anomalous Viscosity

Distortion of Velocity Gradient by Anomalous Viscosity

1981 ◽  
Vol 9 (1) ◽  
pp. 21-24 ◽  
Author(s):  
Goodarz Ahmadi ◽  
Akira Hirose
Keyword(s):  
Velocity Gradient ◽  
Anomalous Viscosity

scholarly journals Studies in the viscosity of colloids. I. The anomalous viscosity of dilute suspensions of rigid anisometric particles

1939 ◽  
Vol 170 (943) ◽  
pp. 519-550 ◽  
Keyword(s):  
Velocity Gradient ◽  
Unit Area ◽  
Tangential Force ◽  
Viscosity Coefficient ◽  
Newtonian Liquid ◽  
Specific Viscosity ◽  
Anomalous Viscosity ◽  
Dilute Suspensions ◽  
Definition Of ◽  
Coefficient Of Viscosity

The laminar flow of a Newtonian liquid is a process the nature of which is so far obscure, but which is characterized by the fact that its maintenance requires the expenditure of energy at a rate proportional to the volume of the liquid and to the square of the velocity gradient maintained in it. The constant of proportionality varies from one liquid to another, and is called the coefficient of viscosity. This definition of viscosity is equivalent to the more common one in terms of tangential force per unit area and velocity gradient. But it is wider in application, and particularly convenient for our purpose, for it enables allowance to be made for the extra expenditure of energy which is involved when particles are suspended in the liquid. By adding this new quantity to the rate of expenditure proper to the flow of the solvent alone, it is possible to arrive at the rate at which energy must be expended in maintaining the flow of the whole system, and so at what may be called an overall viscosity coefficient. It will be seen that the specific viscosity represents just this extra expenditure of energy which results from the presence of the suspended particles.

Effect of Temperature, Velocity Gradient and I.V. Heparin on in Vitro Blood Coagulation and Platelet Aggregation

1967 ◽  
Vol 17 (01/02) ◽  
pp. 112-119 ◽  
Author(s):  
L Dintenfass ◽  
M. C Rozenberg
Keyword(s):  
Blood Coagulation ◽  
Velocity Gradient ◽  
Elevated Temperatures ◽  
Morphological Changes ◽  
Effect Of Temperature ◽  
Clotting Time ◽  
Progressive Change ◽  
Aggregation Of Platelets ◽  
Microscopic Techniques

SummaryA study of blood coagulation was carried out by observing changes in the blood viscosity of blood coagulating in the cone-in-cone viscometer. The clots were investigated by microscopic techniques.Immediately after blood is obtained by venepuncture, viscosity of blood remains constant for a certain “latent” period. The duration of this period depends not only on the intrinsic properties of the blood sample, but also on temperature and rate of shear used during blood storage. An increase of temperature decreases the clotting time ; also, an increase in the rate of shear decreases the clotting time.It is confirmed that morphological changes take place in blood coagula as a function of the velocity gradient at which such coagulation takes place. There is a progressive change from the red clot to white thrombus as the rates of shear increase. Aggregation of platelets increases as the rate of shear increases.This pattern is maintained with changes of temperature, although aggregation of platelets appears to be increased at elevated temperatures.Intravenously added heparin affects the clotting time and the aggregation of platelets in in vitro coagulation.

scholarly journals On the Velocity Gradient in Stably Stratified Sheared Flows. Part 2: Observations and Models

2010 ◽  
Vol 135 (3) ◽  
pp. 513-517 ◽  
Author(s):  
Rostislav D. Kouznetsov ◽  
Sergej S. Zilitinkevich
Keyword(s):  
Velocity Gradient ◽  
Sheared Flows

scholarly journals Impact of Binary Chemical Reaction and Activation Energy on Heat and Mass Transfer of Marangoni Driven Boundary Layer Flow of a Non-Newtonian Nanofluid

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 702
Author(s):  
Ramanahalli Jayadevamurthy Punith Gowda ◽  
Rangaswamy Naveen Kumar ◽  
Anigere Marikempaiah Jyothi ◽  
Ballajja Chandrappa Prasannakumara ◽  
Ioannis E. Sarris
Keyword(s):  
Heat Transfer ◽  
Activation Energy ◽  
Boundary Layer ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Velocity Gradient ◽  
Boundary Layer Flow ◽  
Biological Fluids ◽  
Porosity Parameter ◽  
Layer Flow

The flow and heat transfer of non-Newtonian nanofluids has an extensive range of applications in oceanography, the cooling of metallic plates, melt-spinning, the movement of biological fluids, heat exchangers technology, coating and suspensions. In view of these applications, we studied the steady Marangoni driven boundary layer flow, heat and mass transfer characteristics of a nanofluid. A non-Newtonian second-grade liquid model is used to deliberate the effect of activation energy on the chemically reactive non-Newtonian nanofluid. By applying suitable similarity transformations, the system of governing equations is transformed into a set of ordinary differential equations. These reduced equations are tackled numerically using the Runge–Kutta–Fehlberg fourth-fifth order (RKF-45) method. The velocity, concentration, thermal fields and rate of heat transfer are explored for the embedded non-dimensional parameters graphically. Our results revealed that the escalating values of the Marangoni number improve the velocity gradient and reduce the heat transfer. As the values of the porosity parameter increase, the velocity gradient is reduced and the heat transfer is improved. Finally, the Nusselt number is found to decline as the porosity parameter increases.

scholarly journals Hazardous cyanobacteria integrity response to velocity gradient and powdered activated carbon in water treatment plants

2021 ◽  
Vol 773 ◽  
pp. 145110
Author(s):  
Samylla Oliveira ◽  
Allan Clemente ◽  
Indira Menezes ◽  
Amanda Gois ◽  
Ismael Carloto ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Water Treatment ◽  
Velocity Gradient ◽  
Powdered Activated Carbon ◽  
Water Treatment Plants
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