Timeline for Why does a chimney sometimes create a "draft"?
Current License: CC BY-SA 4.0
7 events
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| Dec 28, 2022 at 16:06 | comment | added | g s | @ruslan I think the down-flowing condition is unstable with the fire lit, as there's a lot of energy being pumped into the system with an element of randomness. I wouldn't want to run the experiment long enough to find out, though. | |
| Dec 28, 2022 at 14:59 | comment | added | Ilmari Karonen | @Ruslan: Yes. Basically the system is bistable. (Or at least, it can be and often is.) One of the stable states is the one where cold air comes in through the room while hot air and smoke go out through the chimney; the other is where cold air comes in through the chimney while hot air and smoke go out through (and into) the room. | |
| Dec 28, 2022 at 14:52 | comment | added | Jack Aidley | I always found popping a lit candle in for 15 minutes worked. | |
| Dec 28, 2022 at 14:12 | comment | added | Ruslan | So, the problem is basically the initial conditions: if the air was moving down, it's going to continue this unless forced to move up. Right? | |
| Dec 28, 2022 at 5:17 | history | edited | g s | CC BY-SA 4.0 |
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| Dec 28, 2022 at 5:09 | history | edited | g s | CC BY-SA 4.0 |
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| Dec 28, 2022 at 5:02 | history | answered | g s | CC BY-SA 4.0 |