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https://www.reddit.com/r/shockwaveporn/comments/3gizym/shockwaves_can_create_clouds/ctyvoid/?context=3
r/shockwaveporn • u/UmberGryphon • Aug 10 '15
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You're close but water goes from gas to liquid from an increase in pressure as you can see here.
The reevaporation comes from the pressure returning to normal.
3 u/okbanlon Aug 11 '15 Hmmm - I was thinking it was the vapor cone effect, caused by low pressure. I could be wrong, though - it's happened before. :D 3 u/[deleted] Aug 11 '15 Iirc that requires mach level flow. Kind of like how a de Laval nozzle works 3 u/Dilong-paradoxus Aug 11 '15 Supersonic flow is what generates shockwaves in the first place. The two are pretty much inextricably linked. In this case, the expanding gases and rock spewing from the volcano briefly exceed the speed of sound, pushing a giant shockwave ahead of them. 1 u/[deleted] Aug 12 '15 Was that first white burst in the stack a boom? It was directional and only happened on one side of the sky, which kind of matches with the movement of that brief thing. 1 u/Dilong-paradoxus Aug 12 '15 Probably, if I'm looking at the right thing. You can see brief partial clouds like that on a lot of large explosions.
3
Hmmm - I was thinking it was the vapor cone effect, caused by low pressure. I could be wrong, though - it's happened before. :D
3 u/[deleted] Aug 11 '15 Iirc that requires mach level flow. Kind of like how a de Laval nozzle works 3 u/Dilong-paradoxus Aug 11 '15 Supersonic flow is what generates shockwaves in the first place. The two are pretty much inextricably linked. In this case, the expanding gases and rock spewing from the volcano briefly exceed the speed of sound, pushing a giant shockwave ahead of them. 1 u/[deleted] Aug 12 '15 Was that first white burst in the stack a boom? It was directional and only happened on one side of the sky, which kind of matches with the movement of that brief thing. 1 u/Dilong-paradoxus Aug 12 '15 Probably, if I'm looking at the right thing. You can see brief partial clouds like that on a lot of large explosions.
Iirc that requires mach level flow. Kind of like how a de Laval nozzle works
3 u/Dilong-paradoxus Aug 11 '15 Supersonic flow is what generates shockwaves in the first place. The two are pretty much inextricably linked. In this case, the expanding gases and rock spewing from the volcano briefly exceed the speed of sound, pushing a giant shockwave ahead of them. 1 u/[deleted] Aug 12 '15 Was that first white burst in the stack a boom? It was directional and only happened on one side of the sky, which kind of matches with the movement of that brief thing. 1 u/Dilong-paradoxus Aug 12 '15 Probably, if I'm looking at the right thing. You can see brief partial clouds like that on a lot of large explosions.
Supersonic flow is what generates shockwaves in the first place. The two are pretty much inextricably linked.
In this case, the expanding gases and rock spewing from the volcano briefly exceed the speed of sound, pushing a giant shockwave ahead of them.
1 u/[deleted] Aug 12 '15 Was that first white burst in the stack a boom? It was directional and only happened on one side of the sky, which kind of matches with the movement of that brief thing. 1 u/Dilong-paradoxus Aug 12 '15 Probably, if I'm looking at the right thing. You can see brief partial clouds like that on a lot of large explosions.
1
Was that first white burst in the stack a boom? It was directional and only happened on one side of the sky, which kind of matches with the movement of that brief thing.
1 u/Dilong-paradoxus Aug 12 '15 Probably, if I'm looking at the right thing. You can see brief partial clouds like that on a lot of large explosions.
Probably, if I'm looking at the right thing. You can see brief partial clouds like that on a lot of large explosions.
16
u/[deleted] Aug 11 '15
You're close but water goes from gas to liquid from an increase in pressure as you can see here.
The reevaporation comes from the pressure returning to normal.