## What is a thixotropic fluid?

Thixotropy is a phenomenon where the viscosity of some fluids depends on the time of share rate, and hence, thixotropy is a time-dependent phenomenon (Koleske, 2012; Mezger, 2014; Wilczyński, 2001). Thus, the viscosity of thixotropic fluids decreases with time.

What is the example 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.

### Is xanthan gum thixotropic?

Xanthan gum solutions are highly pseudoplastic. When shear stress rate is increased, viscosity decreases. Upon the reduction of shear, initial viscosity is recovered in moments. Xanthan solutions are not thixotropic to a significant degree.

Is Oobleck a thixotropic?

Thixotropic liquids decrease in viscosity as stress over time increases. In this case, the sauce’s viscosity decreases and it gets runnier with applied stress. Oobleck is a mixture of cornflour and water (similar to uncooked custard) named after a substance in a Dr Seuss book.

## Is milk example of thixotropic fluid?

Milk, skim milk, cheese, whey and whey permeate are usually considered to be Newtonian fluids. The viscosity of all fluids is temperature dependent. The viscosity of liquids, pastes, suspensions and emulsions decrease with increase in temperature between 2-10 % for each ̊C.

What is the viscosity of xanthan gum?

The xanthan maximum productivity was 21.91 g L-1. Analysis of apparent viscosity was made in solutions of gum at 0.5-2.0%, 25-65 ºC with shear rate of 25-1000 s-1. The maximum viscosity found was 57.30 mPa.

### How do you reduce the viscosity of xanthan gum?

The viscosity of Xanthan gum polymer solutions is reduced by the addition of hydrogen peroxide and adjustment of the pH of the solution to at least 8.0.

Is toothpaste Pseudoplastic fluid?

Toothpaste is what is called a non-newtonian fluid, more specifically toothpaste is a Bingham plastic. This means that the viscosity of the fluid is linearly dependent on the shear stress, but with an offset called the yield stress (see figure below).

## What is consistency coefficient?

The consistency coefficient K measures the average viscosity of the non-Newtonian fluid, and n is the flow behavior index that measures the deviation of the fluid from Newtonian flow. It is the shear-thickening fluid when n > 1, and the shear-thinning fluid when n < 1.