Neglecting brownian motion for certain particle diameters?

In summary, Brownian motion is the random movement of particles suspended in a fluid, caused by collisions with surrounding molecules. This can affect the behavior of particles by causing them to diffuse and spread out over time. However, for larger particle diameters, the effects of Brownian motion can be negligible due to the mass and inertia of the particles. Scientists determine when to neglect Brownian motion by using mathematical models and considering the specific properties of the particles. Neglecting Brownian motion can lead to inaccurate results and affect the development of technologies. While it cannot be completely ignored, its effects can be considered negligible for certain particle sizes and under specific conditions.
  • #1
sina_mech
13
0
Hi,
Imagine we have few particles with different diameters in fluid flow. so, can we neglect brownian forces at certain particle diameters?
Actually I'm looking for a criteria in which we can neglect the effect of brownian forces in fluid flow.

Thanks :-)
 
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  • #2
Sure. You can certainly neglect it for ships, but not for small molecules. The size where you can start neglecting it depends on the other time and length scales and the precision you are interested in.
 

1. What is Brownian motion and how does it affect particle behavior?

Brownian motion is the random movement of particles suspended in a fluid, caused by collisions with surrounding molecules. This motion can affect the behavior of particles by causing them to diffuse and spread out over time.

2. Why would a scientist neglect Brownian motion for certain particle diameters?

In some cases, the effects of Brownian motion can be negligible for particles with larger diameters. This is because the mass and inertia of these particles make them less likely to be significantly affected by the random collisions of surrounding molecules.

3. How do scientists determine when to neglect Brownian motion for certain particle diameters?

Scientists use mathematical models and calculations to determine the strength of Brownian motion for different particle sizes. They also consider the specific properties and behavior of the particles in question to determine if Brownian motion can be neglected.

4. What are the potential consequences of neglecting Brownian motion for certain particle diameters?

If Brownian motion is neglected when it should not be, it can lead to inaccurate results and conclusions in scientific experiments. This can also affect the development of certain technologies and applications that rely on precise understanding of particle behavior.

5. Can Brownian motion ever be completely ignored in scientific research?

No, Brownian motion is a fundamental aspect of particle behavior and cannot be completely ignored. However, for certain particle diameters and under specific conditions, its effects can be considered negligible for practical purposes.

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