The distinction between a thixotropic fluid and a shear thinning fluid:
Some fluids are anti-thixotropic: constant shear stress for a time causes an increase in viscosity or even solidification. Constant shear stress can be applied by shaking or mixing. Fluids which exhibit this property are usually called rheopectic. They are much less common.
Drilling muds used in geotechnical applications can be thixotropic. Honey from honey bees may also exhibit this property under certain conditions.(Heather honey).
Another example of a thixotropic fluid is the synovial fluid found in joints between some bones. The ground substance in the human body is thixotropic, as is semen.
Some clay deposits found in the process of exploring caves exhibit thixotropism: an initially solid-seeming mudbank will turn soupy and yield up moisture when dug into or otherwise disturbed. These clays were deposited in the past by low-velocity streams which tend to deposit fine-grained sediment.
Thixotropy has been proposed as a scientific explanation of blood liquification miracles such as that of Saint Januarius in Naples.
Semi-solid casting processes such as thixomoulding use the thixotropic property of some alloys (mostly light metals) (bismuth). Within certain temperature ranges, with appropriate preparation, an alloy can be put into a semi-solid state, which can be injected with less shrinkage and better overall properties than by normal injection molding.
Solder pastes used in electronics manufacturing printing processes are thixotropic materials.
Many kinds of inks—used in silkscreen textile printing—made from plastisol, exhibit thixotropic qualities. Some, such as those used in CMYK-type process printing, are designed to quickly regain viscosity once they are applied to protect the structure of the dots for accurate color reproduction. This is a sort of reverse thixotropy.
The ink developed for the Fisher space pen is a visco-elastic, thixotropic ink, with a consistency similar to that of very thick rubber cement, flows as a result of the shearing action of the rolling ball in its socket. This shearing action liquefies the solid gel thixotropic ink, allowing the pen to write smoothly and dependably on most surfaces and even underwater.
Clutch-type automatic transmissions do not use fluids with thixotropic properties. The oil in automatic transmissions is used solely for hydraulic actuation and there are no thixotropic properties used in the process of gear change or actuation of clutch packs.
Category:Continuum mechanics Category:Fluid dynamics Category:Non-Newtonian fluids Category:Soil mechanics Category:Soil physics
bg:Тиксотропия de:Thixotropie es:Tixotropía eo:Tiksotropio fa:تیکسوتروپی fr:Thixotropie it:Tissotropia ko:틱소트로피 hu:Tixotrópia nl:Thixotropie ja:チキソトロピー no:Tiksotropi nn:Tiksotropi pl:Tiksotropia pt:Tixotropia ru:Тиксотропная жидкость fi:Tiksotropia sv:Tixotropi uk:ТиксотропіяThis text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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