What are the differences between regimes I and II in drag forces?

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Discussion Overview

The discussion revolves around the differences between regimes I and II in drag forces, as mentioned in a physics video. Participants explore the definitions and contexts of these regimes, seeking clarity on their characteristics and relevance in fluid dynamics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that regime I relates to the temperature of the medium while regime II pertains to density, although this is not confirmed in their textbook or online sources.
  • Another participant expresses unfamiliarity with the terminology of regimes I and II, indicating a need for context to understand its usage.
  • Some participants mention established concepts such as laminar vs. turbulent flow and subsonic vs. supersonic flow, implying these may be relevant to the discussion of drag regimes.
  • A participant provides a link to a Wikipedia article on drag forces, noting the distinction between low Reynolds number drag (Stokes law) and high Reynolds number drag, which is proportional to the square of velocity.
  • Another participant offers to correct a missing parenthesis in the provided link, indicating a collaborative effort to clarify the information shared.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the definitions of regimes I and II, and multiple competing views regarding the terminology and its context remain present throughout the discussion.

Contextual Notes

There is uncertainty regarding the specific definitions of regimes I and II, as well as their relationship to established concepts in fluid dynamics. The discussion reflects a lack of clarity and reliance on external sources for verification.

Who May Find This Useful

This discussion may be of interest to students and educators in physics, particularly those exploring fluid dynamics and drag forces.

wrongusername
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So I was looking at MIT iTunes U physics videos, and the professor talked about regimes I and II in the video about drag forces. I think regime I has to do with the temperature of the medium and regime II has to do with the density. But, I cannot find that information in my 1st semester physics textbook. Nor can I find such info using Google (perhaps I'm using the wrong search terms?:rolleyes:). Can anybody provide me with links to websites containing such stuff in them?
Thank you very much! :D
 
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I've never heard of this terminology before. It sounds very odd... I'd need to see the context of how they are using these words.
 
There is the laminar flow regime vs. the turbulent regime. There is also the subsonic flow regime vs. supersonic. You should be able to tell which two are being distinguished from the context.
 
Phrak said:
There is the laminar flow regime vs. the turbulent regime. There is also the subsonic flow regime vs. supersonic. You should be able to tell which two are being distinguished from the context.

Ok, thanks for the info! :smile:
 
Both regimes are discussed here:
http://en.wikipedia.org/wiki/Drag_(physics )
Low Reynolds number drag is also called Stokes law. High Reynolds number drag (Re > 1000) corresponds to a force that is proportional to square of velocity, like an automobile at highway speeds.
 
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