Timeline for How will Bennu's volatile compounds stay cool and unmodified by the heat of re-entry (OSIRIS-REx)?
Current License: CC BY-SA 3.0
10 events
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| Jun 17, 2020 at 8:54 | history | edited | CommunityBot |
Commonmark migration
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| Sep 11, 2016 at 1:59 | comment | added | uhoh | @Andy one does not "get rid" of energy. The heat shield's interaction with the atmosphere transfers most of the initial kinetic energy of the shuttle to kinetic energy of the gas molecules (in the form of heat (and also some ionization)) but it doesn't just 'go away; some of that is transferred right back to the capsule through contact and through radiation. Even 0.1% transferred would be enough to modify the sample and reduce its usefulness. There's a lot of science in these two sentences! | |
| Sep 10, 2016 at 18:02 | history | edited | Nathan Tuggy | CC BY-SA 3.0 |
Fixed spelling/grammar, blew away fluff, inlined link, tweaked markdown.
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| Sep 9, 2016 at 10:33 | comment | added | ViennaCodex | I don't really know how to calculate the heat in joules. The weight, velocity, and drag based on the size of the craft seem to necessitate a fairly complex model. | |
| Sep 8, 2016 at 15:38 | comment | added | Andy | Yes I agree with the comment by @PearsonArtPhoto - "99%" means the heat shield gets rid of virtually all of the energy, the rest is probably just aerodynamic braking at lower altitudes followed by drogues + chutes. | |
| Sep 8, 2016 at 12:01 | comment | added | PearsonArtPhoto♦ | The rest should be in the parachute mostly. | |
| Sep 8, 2016 at 7:19 | comment | added | uhoh | You could also say something like "OK I'll see what more I can find out" no need to delete. The heat shield interacts with the atmosphere, and together they might get rid of 99% of the kinetic energy. If that thing weights 10kg for example, then the 1% is still 7.7 MegaJoules. The heat shield and the plasma in contact with it (and radiating back to it) are going to be really really hot for say 100 sec. I think the interesting thing is the sample is within centimeters of something almost white hot - how does it stay cool, and how cool does it actually stay? It must be amazing insulation! | |
| Sep 8, 2016 at 6:46 | comment | added | ViennaCodex | Agreed, it is an opinion. The issue is really dependent on the type of insulation used to hold the samples. I may delete the answer as insufficient | |
| Sep 8, 2016 at 4:36 | comment | added | uhoh | Thanks, but have you calculated how big the other 1% is in Joules? "That should be enough" seems to be an opinion. Can you find something quantitative you can link to? | |
| Sep 8, 2016 at 4:20 | history | answered | ViennaCodex | CC BY-SA 3.0 |