Timeline for How could the 2018-08-30 Soyuz MS-09 / ISS leak be so slow?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Oct 14, 2018 at 16:45 | comment | added | Organic Marble | The flow would be choked (pressure ratio > critical pressure ratio of ~ 2, exact value unimportant since the downstream pressure is zero). That simplifies calculation somewhat. | |
| Sep 17, 2018 at 19:52 | comment | added | Uwe | It was somewhat over simplified. A pressure drop of at least 2:1 is needed to accelerate the gas to the speed of sound. When the pressure drops 0.5 bar, the volume expands to double. The volume flow is therefore not 3.7 m^3/hr but about 1.85 m^3/hr. But that is still only an upper limit. | |
| Sep 17, 2018 at 11:10 | comment | added | uhoh | @Uwe I never thought about that, it's a handy insight thanks! | |
| Sep 17, 2018 at 11:08 | comment | added | Uwe | An upper limit would be the speed of sound within the hole. That is 3.7 m^3/hr at a pressure of 1 bar. But pressure should be lower at the point where the speed of sound is reached. | |
| Sep 9, 2018 at 10:32 | review | Suggested edits | |||
| Sep 9, 2018 at 10:39 | |||||
| Sep 8, 2018 at 10:21 | history | edited | uhoh | CC BY-SA 4.0 |
added 12 characters in body
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| Sep 8, 2018 at 10:15 | history | edited | uhoh | CC BY-SA 4.0 |
added 137 characters in body
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| Sep 8, 2018 at 9:05 | history | answered | uhoh | CC BY-SA 4.0 |