What is pseudoplastic fluid?
In contrast to a Bingham fluid, a pseudoplastic fluid is a fluid that increases viscosity as force is applied. A typical example is a suspension of cornstarch in water with a concentration of one to one. This cornstarch behaves like water when no force is applied; however, it is solidified as force is applied.
What is the main difference between a thixotropic fluid and a shear thinning pseudoplastic fluid?
The difference between rheopectic and thixotropic fluids is very similar to the difference between dilatant and pseudoplastic fluids: both are Non Newtonian fluids but while one, pseudoplastic, is shear thinning (viscosity decreases with increased stress) the other, dilatant, is shear thickening (viscosity increases …
Is milk a thixotropic fluid?
Human milk showed non-Newtonian, shear-thinning, thixotropic behavior with both yield and flow stresses. Storage and aging increased milk density and decreased viscosity.
What is Rheopectic fluid?
Rheopecty or rheopexy is the rare property of some non-Newtonian fluids to show a time-dependent increase in viscosity (time-dependent viscosity); the longer the fluid undergoes shearing force, the higher its viscosity. Rheopectic fluids, such as some lubricants, thicken or solidify when shaken.
Which among the following is the example of thixotropic fluid?
Thixotropic: Apparent viscosity for thixotropic fluids decreases with time under constant applied shear stress. Example: Crude oil, lipstick, certain paints, and Printing Ink.
What are pseudoplastic fluids dilatant fluids and Bingham fluids?
– Fluids That Decrease in Viscosity When Force Is Applied – Substances that decreases in viscosity when force is applied to them are called pseudoplastic fluids. Before force is applied, these substances have a high viscosity, appearing at a glance to be Bingham fluids, but they do not have a yield value.
What are the examples of thixotropic fluid?
Other examples of thixotropic fluids are gelatine, shortening, cream, xanthan gum solutions, aqueous iron oxide gels, pectin gels, hydrogenated castor oil, carbon black suspension in molten tire rubber, many floc suspensions, and many colloidal suspensions.
Which is an example of a pseudoplastic fluid?
Some common examples of pseudoplastic fluids include ketchup, paint, cornstarch in water suspension, etc. The behaviour of thixotropic fluids is described as time-dependent pseudoplastic behaviour. The following table summarizes the difference between thixotropic and pseudoplastic fluids.
How are thixotropic fluids different from rheopectic fluids?
In contrast, the behaviour of rheopectic fluids can be described as a time-dependent dilatant behaviour. Furthermore, thixotropic fluids show a non-linear stress-strain behaviour as well. Therefore, longer the fluid goes under shear stress, lower the viscosity of the fluid becomes.
When does viscosity of pseudoplastic fluid decrease?
A pseudoplastic fluid is one whose viscosity decreases as the shear rate in the pump increases. Bastian E. Rapp, in Microfluidics: Modelling, Mechanics and Mathematics, 2017
What makes a pseudoplastic fluid a shear thinning fluid?
A pseudoplastic fluid is one whose viscosity decreases as the shear rate in the pump increases. Pseudo-plastic fluids are also referred to as shear-thinning fluids.