Timeline for Predict liquid film thickness outside a cylinder, under the influence of a) external gas flow and b) heating of the cylinder
Current License: CC BY-SA 3.0
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| Apr 13, 2017 at 12:53 | history | edited | CommunityBot |
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| Jun 1, 2016 at 7:47 | answer | added | Han-Kwang Nienhuys | timeline score: 3 | |
| May 31, 2016 at 20:19 | history | tweeted | twitter.com/StackPhysics/status/737740321040289793 | ||
| May 31, 2016 at 13:23 | history | edited | DeltaIV | CC BY-SA 3.0 |
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| May 31, 2016 at 13:12 | comment | added | DeltaIV | I wrote in the question that "I need to dimension the system so that a thin film of liquid is generated around the cylinder", so obviously I need a specific result (thin film). At the same time I'd like to be able to predict how thin the film will be. If you can indicate me how to design the system in order to obtain such a thin film, that would be great. | |
| May 31, 2016 at 13:07 | history | edited | DeltaIV | CC BY-SA 3.0 |
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| May 31, 2016 at 12:48 | comment | added | Han-Kwang Nienhuys | The generic case would need to cover all variations of high/low surface tension, high/low contact angle, high/low Reynolds number, and so on and would cover many pages and weeks of work. You are not going to get that here. Either ask what would happen in a specific configuration or ask how to achieve a specific result (e.g. a continuous film). One hint: unless you design carefully, you will get channeling (like rain on a window), not a smooth film. | |
| May 31, 2016 at 12:29 | history | edited | DeltaIV | CC BY-SA 3.0 |
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| May 31, 2016 at 12:19 | comment | added | DeltaIV | @Han-KwangNienhuys, to give more context, I'll add some reference values for the parameters, but they are in no way definitive, and may be changed by an order of magnitude if needed. | |
| May 31, 2016 at 12:16 | comment | added | DeltaIV | @Han-KwangNienhuys, the setup hasn't been frozen. I could change dimensions and materials if needed. I could even change geometry and orientation, if that's really needed (for example, go to an horizontal, 2D setup, instead than the actual axisymmetric, vertical setup), though I would only do that if it's extremely difficult to get what I want with the current setup. Can you assume generic values for the parameters, and write $h$ as a function of those parameters? This way, I could compare different setups (speed, flow rate, radius, etc.) in terms of the corresponding $h$. | |
| May 31, 2016 at 12:10 | comment | added | DeltaIV | @NauticalMile, added a sketch, hope it's more clear now. | |
| May 31, 2016 at 12:10 | history | edited | DeltaIV | CC BY-SA 3.0 |
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| May 30, 2016 at 18:12 | comment | added | Han-Kwang Nienhuys | You need to provide material properties and approximate dimensions. The outcome will depend on the surface tension and the contact angle between the liquid and the surface. With water on a typical surface, you won't get a film, but at best a layer of a few mm thick and a velocity that is likely higher than "very low". | |
| May 30, 2016 at 17:32 | comment | added | DeltaIV | Ok! Cannot draw right now but I'll be home in about an hour and I will make a picture. Thanks for your interest in the question! | |
| May 30, 2016 at 17:24 | comment | added | NauticalMile | I might be able to help, but I'm having difficulty picturing the scenario. A diagram of the scenario you are describing would be very helpful. | |
| May 30, 2016 at 17:06 | history | edited | DeltaIV | CC BY-SA 3.0 |
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| May 30, 2016 at 16:56 | review | First posts | |||
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| May 30, 2016 at 16:55 | history | asked | DeltaIV | CC BY-SA 3.0 |