Talk:Streamlines, streaklines, and pathlines
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[edit] Merge
I think that in explaing one term it makes sense to explain the others, prehaps rename the article Streamlines, Streaklines and Pathlines? Already this article deals with all three so it would be much work. Rex the first 08:23, 20 April 2006 (UTC)
[edit] Differences?
The article states that streaklines are found by injecting smoke into a wind tunnel from one point. How is this different from streamlines? —Ben FrantzDale 02:22, 29 April 2007 (UTC)
- Hmm, I am not an engineer so I do not know how streamlines are measured I can only say that injecting smoke from a point would measure the streaklines and not the streamlines (unless the flow was steady). If the flow changed direction (for example it was pointing up and it now points left) then the smoke would show the path that the flow did take in the past (streaklines), not the path parallel to the flow at a given instant (streamlines). Rex the first talk | contribs 21:04, 29 April 2007 (UTC)
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- OK, so for steady flow, streamlines are the same as streak lines?
- Even in time-varying flow, it seems like you can use smoke or bubbles to find streamlines by basically using particle image velocimetry. That is, watch the particles for a moment and see where they traveled. —Ben FrantzDale 21:18, 29 April 2007 (UTC)
- Yes, for steady flows they are the same (see the steady flow section). I know very little about how streamlines are actually measured. For a quick glance at particle image velocimetry is seems like smoke is rarely used. If you find out more please add it to this article. There is a great historical tradition for using soot that I came across recently, see The discovery of the Mach reflection effect and its demonstration in an auditorium (not sure if you will be able to access this). Rex the first talk | contribs 13:48, 4 May 2007 (UTC)
