Mechanism of Oobleck - Non-Newtonian Fluid

Thread starter SgrA*
Start date Jan 24, 2014
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Fluid Mechanism Non-newtonian fluid

In summary, Oobleck is a non-Newtonian fluid made by mixing cornstarch and water in a specific ratio. It can act as both a liquid and a solid depending on the amount of force applied to it, due to the mechanism of shear thickening. The ratio of cornstarch and water can be adjusted to change its properties, and studying its mechanism can have practical applications in various industries and in understanding other complex fluids.

Jan 24, 2014

SgrA*

Hi,

What is the molecular-level mechanism of shear-thickening of oobleck (cornstarch-water paste)?

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Jan 24, 2014

Borek

Mentor

I don't think there is a molecular level mechanism - I am under impression it is an effect of the interaction of starch grains, which are composed of many polymer molecules.

But I can be wrong.

1. What is Oobleck?

Oobleck is a non-Newtonian fluid that is made by mixing cornstarch and water in a specific ratio. It is named after the fictional substance in the Dr. Seuss book "Bartholomew and the Oobleck".

2. How does Oobleck behave differently from other fluids?

Oobleck has unique properties that make it behave differently from other fluids. It can act as both a liquid and a solid depending on the amount of force applied to it. When force is applied, the cornstarch particles stick together and form a solid-like structure. But when there is no force, the particles slide past each other like a liquid.

3. What is the mechanism behind the non-Newtonian behavior of Oobleck?

The mechanism behind the non-Newtonian behavior of Oobleck is called shear thickening. When a force is applied to the fluid, the cornstarch particles are forced closer together, causing them to lock into a rigid structure. This makes the fluid act more like a solid. Without a force, the particles can move freely, making the fluid act like a liquid.

4. Can the ratio of cornstarch and water be adjusted to change the properties of Oobleck?

Yes, the ratio of cornstarch and water can be adjusted to change the properties of Oobleck. A higher ratio of cornstarch to water will result in a thicker and more solid-like Oobleck. A lower ratio will result in a more liquid-like Oobleck.

5. What are the practical applications of studying the mechanism of Oobleck?

Studying the mechanism of Oobleck can have practical applications in various industries, such as food, cosmetics, and medicine. It can also be used in the development of new materials, like bulletproof vests or impact-resistant coatings. Understanding non-Newtonian behavior can also help in studying other complex fluids and their applications.