Timeline for How does upstream dilation of a pipe affect downstream velocity?
Current License: CC BY-SA 4.0
25 events
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| Feb 29, 2020 at 22:11 | comment | added | cumfy | Could you please clarify. Thanks. | |
| Feb 29, 2020 at 22:09 | comment | added | cumfy | So the solution is D2=Da ? | |
| Feb 29, 2020 at 3:14 | vote | accept | S.C. | ||
| S Feb 29, 2020 at 3:13 | history | bounty ended | S.C. | ||
| S Feb 29, 2020 at 3:13 | history | notice removed | S.C. | ||
| Feb 25, 2020 at 3:39 | answer | added | cumfy | timeline score: 0 | |
| Feb 24, 2020 at 21:00 | history | tweeted | twitter.com/StackPhysics/status/1232047703636500480 | ||
| Feb 24, 2020 at 19:41 | answer | added | Jokela | timeline score: 2 | |
| S Feb 22, 2020 at 0:22 | history | bounty started | S.C. | ||
| S Feb 22, 2020 at 0:22 | history | notice added | S.C. | Authoritative reference needed | |
| Feb 19, 2020 at 16:25 | answer | added | Thermodynamix | timeline score: 1 | |
| Feb 19, 2020 at 15:11 | history | edited | S.C. | CC BY-SA 4.0 |
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| Feb 19, 2020 at 15:05 | history | edited | S.C. | CC BY-SA 4.0 |
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| Feb 19, 2020 at 14:57 | history | edited | S.C. | CC BY-SA 4.0 |
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| Feb 19, 2020 at 14:52 | comment | added | S.C. | @Drew absolutely. I will include them in the assumptions. I didn't realize the values would be essential to answer the question from a theoretical (rather than engineering/approximate) point of view. My apologies. I'll make the edit now. Edit: The values are up. | |
| Feb 19, 2020 at 13:58 | comment | added | Thermodynamix | @S.Cramer, whether or not viscous effects are important depend on the actual values of velocity, the diameter, and the viscosity of the fluid. Specifically, if $Re_D(D/L)<<1$, where $L$ is the length of a section, and $Re_D$ is the Reynolds number based on the diameter of the section, then viscous effects dominate. Can you provide some typical numerical values for your system? | |
| Feb 19, 2020 at 2:29 | comment | added | Chet Miller | Then for conservation of mass, the exit velocity is independent of the diameter of the intermediate section. | |
| Feb 19, 2020 at 0:22 | comment | added | S.C. | @Drew after looking up the strategy that you refer to, either I am grossly misapplying the technique (which is certainly possible) or the assumptions imposed in this technique are wildly violated in the above depicted situation. Using a more "real world example", if I stepped on a hose in the middle of its length, the velocity that exits the tip of the hose would certainly be less than if I had not stepped on the middle of hose. Your strategy does not predict this. Presumably because the "viscous force" assumptions are violated. | |
| Feb 18, 2020 at 23:19 | comment | added | S.C. | @Drew I have no clue how to perform that calculation...so it is not "simple" with respect to my skill set. | |
| Feb 18, 2020 at 23:01 | comment | added | Thermodynamix | A simple momentum balance on the control volume of your pipe should tell you the answer. | |
| Feb 18, 2020 at 22:52 | history | edited | S.C. | CC BY-SA 4.0 |
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| Feb 18, 2020 at 22:51 | comment | added | S.C. | @ChetMiller Yes, $v_o$ is the same in both case. The fluid is water...I will put this in the assumptions. So, yes, it is incompressible. | |
| Feb 18, 2020 at 21:43 | comment | added | Chet Miller | Is vo the same in both cases? Is the fluid incompressible? | |
| Feb 18, 2020 at 21:35 | review | Close votes | |||
| Feb 22, 2020 at 0:25 | |||||
| Feb 18, 2020 at 20:27 | history | asked | S.C. | CC BY-SA 4.0 |