tangent - 30-3-2003 at 11:27
Samosa wrote...
quote:
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Atleast I know that if a hollow tube of H.E. is detonated, the air in the cavity is ionized(fill the tube with a lower vod H.E. than the first and you
get overdriven detonation, that's interesting too)
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A bit off topic... But why does that work? Is it because the detonation wave propogates more quickly in a vacuum? Or does the ionization somehow
affect the second detonation?
--
so... anyone have a clue? inquiring minds want to know.
-t
DDTea - 1-4-2003 at 12:18
My reasoning that the resulting vacuum would be the case is because
it would be a natural assumption that matter (such as the expanding gases produced in an explosion) would travel at higher speeds in the absence of
air resistance. After a high-speed detonation, there is a brief period where a vacuum is created from the point at which the detonation originated. If
a second detonation were to occur quickly after this first one, the expanding gases from the second explosion could make use of the vacuum and
propogate faster.
PHILOU Zrealone - 1-4-2003 at 17:22
Theorically yes two waves of same speed will gather because the first has more resistance to fight and thus the second one will be a little bit faster
until they add!
On the detonation model, it is impossible because the solid explosive supports the detonation and detonation produces gases in the sense of its
travel; nothing is left behind; so a second detonation wave just behind is impossible!
Normally detonation of HE is insensitive to the fact it happens in the vaccuum or not; VOD is stil the same (except for ANFO's where bubbles are
needed for hot spots); also the vaccuum will fast be filled by genertated gases!
Also know this: In a detonation process, speed of reaction is faster than any matter speed; this explains why VOD is independant of vaccuum presence
or not!
Cappy - 3-4-2003 at 13:59
Are you saying the the velocity of detonation is overdriven, or the velocity of gasses is overdriven.
I can't see how a vacuum would assist the former, as sound propogates faster in denser media IIRC. This would leave me to believe that shockwaves
would travel faster too.
[Edited on 4/3/2003 by Cappy]
PHILOU Zrealone - 7-4-2003 at 03:19
No overdriven gas and no overdriven detonation!
VOD is usually faster than any molecular moves; no mather the support of the detonation being solid, liquid or gaseous!
Scientwisted - 4-1-2014 at 09:22
Would someone explain to me where the Idea of a vacuum came from?
I was under the impression that the tube that tangent is referring to is filled w/ HE and air, not a voided cavity. And if it is a vacuum what is
ionizing?
Edit: Celebrating my first Post on sciencemadness.
[Edited on 4-1-2014 by Scientwisted]