All Questions
14 questions
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Explosions in high viscosity liquids
I was watching The Score (2001) in which De Niro manages to make a hole in a cobalt and titanium infused steel safe. he fills it with water. inserts an explosive and boom! the safe is open.
It made me ...
- 11
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2
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70
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What is the entity that resides at a point with a radial coordinate $r$?
In his groundbreaking paper The formation of a blast wave by a very intense explosion I. Theoretical discussion, G.I.Taylor presented a number of equations, including the ones depicted below:
In ...
- 100
1
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145
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Normal Shockwaves and its Thermodynamics
Please read this page before going to my question.
When we derive the relation between Mach no. to the left side of the shock wave (M1) and that to the right side of the shock wave (M2),we do that ...
- 349
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446
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Why the total temperature remains constant through shock wave? [closed]
We know that total temperature is sum of static and dynamic temperature. If static temperature increases through the shock wave, then how total temperature remains constant? It must increase and not ...
- 47
2
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2
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157
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How acoustic shock waves create and propagate in fluid?
I would like to understand how a shock wave is formed starting from the comservation equations. I know how to obtain a the wave equation with a perturbative approach (i.e assuming very small ...
- 23
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Why did the Baker Shot have a normal mushroom cloud instead of a radial blast wave?
The US tested its first underwater nuclear device with the Baker Shot in Bikini lagoon. It was supposed to be identical to the Fat Man device dropped on Japan. However it was measured at 23 kt ...
- 2,754
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1
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1k
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Mach number at the throat of Convergence-Divergence nozzle
Why is it important to have a Mach number=1 at the throat of Convergence-Divergence nozzle? What if the Mach number at the throat is less than 1? Is a modification in the nozzle design required then?
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How is pressure "lost" in a supersonic inlet?
I understand that a shock wave cannot happen in reverse (since you don't get shock waves in nozzles), but what trips me up is this; stagnation (fluid-brought-to-a-stop) pressure decreases in the ...
3
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1
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450
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What happens during cavitation?
Cavitation is vapor bubbles and when they implode creates a shock wave, before imploding the bubble can reach temperatures of 10000k.
I want to know what conditions must be met to make cavitation, ...
user239759
1
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1
answer
290
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First law of therodynamics appiled across a normal shock
This is a snippet from the book Compressible Flow by Anderson. Here, he is trying to evaluate the change in entropy across the shock using the relation,
$s_2 - s_1 = c_p \ ln \frac{T_2}{T_1} - R \ ln ...
4
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2
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310
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Sonic Boom in Aircraft and Spacecraft
I would like to know why aircraft, and spacecraft produce a double sonic boom on breaking the sound barrier.
A while ago, I thought I got it, as there’s a start and finish point to every vehicle.
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3
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How does shockwave from hypersonic movement protect the moving object from air?
The Steak Drop article from the What If? book says:
The steak spends a minute and a half over Mach 2, and the outer surface will likely be singed, but the heat is too quickly replaced by the icy ...
- 929
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1
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Why does stagnation pressure reduce across a normal shock?
I am seeking an explanation for this graph where the subscript "1" refers to the supersonic region and the subscript "2" refers to the subsonic region present beyond a normal shock.
The static ...
- 28
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4
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Why do vapour cones form around jet fighters?
Apparently this phenomenon has nothing to do with jets breaking the sound barrier and has something to do with the Prandtl-Glauert singularity as described on Wikipedia. But, the Wikipedia article isn'...
user29305