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Dynamic viscosity is a material property which describes the resistance of a fluid to shearing flows. It corresponds roughly to the intuitive notion of a fluid's 'thickness'. For instance, honey has a much higher viscosity than water. Viscosity is measured using a viscometer. Measured values span several orders of magnitude.
Boger fluids are named after David V. Boger, who in the late 1970s was the primary researcher pushing for the study of constant viscosity elastic liquids. [2] He released his first paper on Boger fluids in 1977, titled "A Highly Elastic Constant-Viscosity Fluid", where he described the ideal fluid for experimentation as a fluid that is "highly viscous and highly elastic at room temperature and ...
In a Newtonian fluid, the relation between the shear stress and the shear rate is linear, passing through the origin, the constant of proportionality being the coefficient of viscosity. In a non-Newtonian fluid, the relation between the shear stress and the shear rate is different. The fluid can even exhibit time-dependent viscosity. Therefore ...
Food rheology is the study of the rheological properties of food, that is, the consistency and flow of food under tightly specified conditions. [1] The consistency, degree of fluidity , and other mechanical properties are important in understanding how long food can be stored, how stable it will remain, and in determining food texture.
In 1966, Heinz List established his own company to further develop the field of high-viscosity processing. Heinz List established the LIST Dry Processing Group based on the following: Machines that can handle multiple phase transitions (wet, pasty, viscous, powdery, granular) in one working step provide maximum energy efficiency and process yield.
As the plates compressed the sample, if the sample retained a cylindrical shape without bulging, this is evident that there is a lack of shear flow. Using this method, peanut butter has been determined to be a power-law fluid with shear thinning properties. [7] In other words, under high shear rates, there is a lower apparent viscosity.
Guar gum, also called guaran, is a galactomannan polysaccharide extracted from guar beans that has thickening and stabilizing properties useful in food, feed, and industrial applications. [1] The guar seeds are mechanically dehusked, hydrated, milled and screened according to application. [2] It is typically produced as a free-flowing, off ...
In continuum mechanics, 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. [1] Rheopectic fluids, such as some lubricants, thicken or solidify when shaken.