The thixotropy is a physical property complexes that one finds in some Fluide S.

Definition

One can define it as follows: a fluid is known as thixotropic so under constraint (or gradient speed) constant, its viscosity evolves/moves during time. It is said that the fluid déstructure when it becomes liquid and conversely, that it is restructured when a viscoelastic phase appears. The physical property of thixotropy is thus: left at rest, the thixotropic fluid will be restructured until having the aspect of a solid (infinite viscosity), whereas under sufficiently high constant constraint to break the structure formed at rest for example, the fluid goes déstructurer until its liquid state (low viscosity). The thixotropic phenomena are thus of origins structural. Attention, one should not confuse thixotropy and the rheofluidification. This last watch an evolution of viscosity with a variation of the pressure applied to the fluid.

Examples and applications

One can quote some examples of thixotropic fluids:

• the Honey
• the Mayonnaise
• the Foam to shave
• the Ketchup
• natural clay suspensions (Bentonite)
• the concretes autoplaçants
• Certain muds of oil drilling
• Certain toothpastes
• Certain polymer solutions

The study of the thixotropy of the fluids revêt a great importance in the industry of paintings.

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