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A dilatant (/ d aɪ ˈ l eɪ t ə n t /, / d ɪ-/) (also termed shear thickening [1]) material is one in which viscosity increases with the rate of shear strain. Such a shear thickening fluid , also known by the initialism STF , is an example of a non-Newtonian fluid .
The viscosity of a shear thickening – i.e. dilatant – fluid appears to increase when the shear rate increases. Corn starch suspended in water ("oobleck", see below) is a common example: when stirred slowly it looks milky, when stirred vigorously it feels like a very viscous liquid.
Rheopecty: The longer the fluid is subjected to a shear strain, the higher the viscosity. Time-dependent shear thickening behavior. Thixotropy: The longer a fluid is subjected to a shear strain, the lower its viscosity. It is a time-dependent shear thinning behavior. Shear thickening: Similar to rheopecty, but independent of the passage of time.
Dilatant, or shear-thickening fluids increase in apparent viscosity at higher shear rates. They are in common use in viscous couplings in automobiles. When both ends of the coupling are spinning at the same rotational speed, the viscosity of the dilatant fluid is minimal, but if the ends of the coupling differ in speed, the coupling fluid ...
Shear-thickening (dilatant) liquids, whose viscosity increases with the rate of shear strain. Shear-thinning liquids, whose viscosity decreases with the rate of shear strain. Thixotropic liquids, that become less viscous over time when shaken, agitated, or otherwise stressed.
Thixotropy is a time-dependent shear thinning property. Certain gels or fluids that are thick or viscous under static conditions will flow (become thinner, less viscous) over time when shaken, agitated, shear-stressed, or otherwise stressed (time-dependent viscosity). They then take a fixed time to return to a more viscous state. [1]
Pre-exercise hyperhydration with sodium or glycerol—another compound that promotes fluid balance that's found naturally in food, used as an sweetener and thickening agent, and sometimes sold as ...
The shear thickening fluid is normally made with polyethylene glycol and the solid part is made of nano-particles of silica. This liquid is soaked into all the layers of a Kevlar vest. [8] The magnetorheological fluid consists of magnetic (typically iron) particles in a carrier fluid such as oil.