Does a humam body movement generate a vacumm trail? and more

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SUMMARY

The discussion centers on whether human body movement generates a vacuum trail and the implications of aerodynamic drag. A participant inquires about the necessary velocity for a body part with a volume of 60 cm³ to create a vacuum that exerts 78 megapascals of pressure over a 3-meter radius. Experts clarify that this pressure is unrealistic, as atmospheric pressure is only 0.1 megapascals, and emphasize that the phenomenon being described relates to aerodynamic drag, where a higher pressure area exists in front of a moving object and a lower pressure area behind it.

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  • Understanding of aerodynamic drag principles
  • Basic knowledge of pressure measurement in megapascals
  • Familiarity with fluid dynamics concepts
  • Ability to perform calculations involving volume and pressure
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  • Research the principles of aerodynamic drag and its effects on moving objects
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Physics students, engineers, and anyone interested in the mechanics of motion and fluid dynamics will benefit from this discussion.

Gabriel Ulisses
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I will start with an excuse, sorry english is not my main lengauge and i don't practice grammar that much, it is my first time in these forums so be kind, i hope i posted on the right forum thank you for the comprehension.
When you move your arm for example do you generate a trail of vacuum behind it? and does the air ocupating the vacuum space generate force?
I got as especific is i could get if you need anymore values for the calculations ask,i can give preety much anything.
How would you calculate:
What would be the nescessary velocity for a 60cm³ random body part of you (volume) to generate enough vacuum so the air ocupating it space would generate 78 megapascal of pressure on a circle of 3 meter radius?
 
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Welcome to PF!

What I think you are referring to is aerodynamic drag. There is a higher pressure area in front of you and a lower pressure area behind. But 78 megapascal? Atmospheric pressure is only 0.1 megapascals, so no...
 
russ_watters said:
Welcome to PF!

What I think you are referring to is aerodynamic drag. There is a higher pressure area in front of you and a lower pressure area behind. But 78 megapascal? Atmospheric pressure is only 0.1 megapascals, so no...
I was expecting an absurd number, something actually inhumanly posible, and yes i think aerodynamic drag is watch I'm refeering to, it is the air ocupating the vacuum created by movement right?
 

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