Timeline for Is there a simple equivalent to Ohm's law for gas (pressure$=R*$throughput)?
Current License: CC BY-SA 4.0
20 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 31, 2020 at 9:43 | history | edited | Qmechanic♦ | CC BY-SA 4.0 |
edited tags; edited title
|
| Dec 31, 2020 at 9:41 | answer | added | Gabriel Santos | timeline score: 0 | |
| Jul 13, 2015 at 11:04 | answer | added | AGN | timeline score: 1 | |
| Jul 11, 2015 at 22:27 | history | edited | Mister Mystère | CC BY-SA 3.0 |
added 199 characters in body
|
| Jul 11, 2015 at 2:41 | answer | added | docscience | timeline score: 2 | |
| Jul 10, 2015 at 22:04 | comment | added | Mister Mystère | Probably not now that you mention it (thanks), since there is quite a big difference in pressure so the density can be expected to be higher out of the obstacle. But if I use the same venturi equation and correct the density using the perfect gases law, does that make it roughly okay? Reminder: the pump cycle is 90Hz, so no high speed flow. | |
| Jul 10, 2015 at 21:59 | comment | added | Bernhard | In your venturi equation and mass convervation you are assuming constant density. Is that actually the case for what you are studying? | |
| Jul 10, 2015 at 21:47 | history | edited | Mister Mystère | CC BY-SA 3.0 |
added 14 characters in body
|
| Jul 10, 2015 at 21:41 | history | edited | Mister Mystère | CC BY-SA 3.0 |
added 14 characters in body
|
| Jul 10, 2015 at 21:02 | history | rollback | Mister Mystère |
Rollback to Revision 3
|
|
| Jul 10, 2015 at 20:55 | comment | added | Mister Mystère | Thank you all for your comments. My application is low speed (90Hz pump cycles), but doesn't look anything like a pipe (no idea what the pipe length can be for example) so if I shouldn't use venturi what should it be? | |
| Jul 10, 2015 at 20:41 | comment | added | Mike Dunlavey | Electrical resistance (in a resistor) is just a fluid (free electrons) flowing through a lattice under pressure difference (voltage gradient) and bouncing off atoms, making them hot. Seems to me it's practically the same thing as flow in pipes at low speed. At higher speeds you get pressure relative to speed squared, so that's different. The latter is Bernoulli's venturi equation, so you probably want to stick to pipe flow. | |
| Jul 10, 2015 at 20:33 | comment | added | Warren Dew | I learned this in college, but have forgotten. I'm sure you could find it in the CRC Handbook of Chemistry and Physics. Also, the equation changes when the flow is transonic. | |
| Jul 10, 2015 at 20:06 | history | edited | Bernhard | CC BY-SA 3.0 |
Removed specific case
|
| Jul 10, 2015 at 20:03 | comment | added | Bernhard | In my opinion this question is much better when leaving out your specific situation. | |
| Jul 10, 2015 at 19:42 | comment | added | Mister Mystère | I don't know, CFD is not my domain of expertise... What do you think about the Venturi's equation? I just updated my post with it | |
| Jul 10, 2015 at 19:41 | history | edited | Mister Mystère | CC BY-SA 3.0 |
added 241 characters in body
|
| Jul 10, 2015 at 19:09 | comment | added | Kyle Kanos | Also: I thought Hagen-Poiseuille's law was valid for incompressible and compressible fluids? (Or at least an alternate form when considering compressibility). I mean, it's really $\Delta P\propto\Delta F$, no? | |
| Jul 10, 2015 at 18:24 | history | edited | Mister Mystère | CC BY-SA 3.0 |
edited tags
|
| Jul 10, 2015 at 18:13 | history | asked | Mister Mystère | CC BY-SA 3.0 |