Micrometeorites and Karman effect

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SUMMARY

This discussion centers on the collection and analysis of micrometeorites (MM), specifically focusing on their physical characteristics and behavior. Observations indicate that glassy micrometeorites exhibit tails due to high-speed movement and melting of the silicon layer, while smaller globules display twisted tails attributed to Karman vortices. The participant, Michiel, seeks a method to calculate the velocity of these globules during instability, noting that globules without tails average 0.1 mm in diameter, while those with twisted tails measure approximately 0.05 mm.

PREREQUISITES
  • Understanding of micrometeorite collection techniques
  • Familiarity with fluid dynamics concepts, particularly Karman vortices
  • Knowledge of material properties, specifically silicon behavior under heat
  • Basic skills in measuring and analyzing particle sizes
NEXT STEPS
  • Research methods for calculating particle velocity in fluid dynamics
  • Explore the effects of temperature on silicon and its melting behavior
  • Investigate Karman vortex formation and its implications for small particles
  • Study micrometeorite collection and analysis techniques in greater detail
USEFUL FOR

This discussion is beneficial for amateur astronomers, materials scientists, and researchers interested in the behavior and properties of micrometeorites and their interactions with atmospheric conditions.

Arac15
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Micro meteorites

I am collecting micrometeorites (MM).

An observation is that glassy MM show tails.
I think this is because they are moving fast, and are heated, and the top layer silicon melts and lag behind.

A second observation is that smaller globules have twisted tails.
I think that it is caused by Karman vortex when these particles are moving very fast.

My question is, can anybody give me the way to calculate the velocity of the globules when instability occurs.
As an indication; globules with no tail have a average diameter of 0.1 mm.
The globules with twisted tails have a oval form and have a diameter of about 0.05mm.
Michiel
parac.eu
 
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Arac15 said:
Micro meteorites

I am collecting micrometeorites (MM).

An observation is that glassy MM show tails.
I think this is because they are moving fast, and are heated, and the top layer silicon melts and lag behind.

A second observation is that smaller globules have twisted tails.
I think that it is caused by Karman vortex when these particles are moving very fast.

My question is, can anybody give me the way to calculate the velocity of the globules when instability occurs.
As an indication; globules with no tail have a average diameter of 0.1 mm.
The globules with twisted tails have a oval form and have a diameter of about 0.05mm.
Michiel
parac.eu
What do you mean by "collecting"? Are you collecting pictures, or somehow collecting the MMs themselves?

Also, can you link to some pictures of what you are describing, and maybe link to some web pages with more information about the behavior of MMs?
 

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