Who made up the exact timings? -- rec --
On Sat, Aug 5, 2023, 9:10 AM Stephen Guerin <stephen.gue...@simtable.com> wrote: > There were 10 or so intermediate prompts to drive chatGPT to that lab > report. > > On Sat, Aug 5, 2023, 8:52 AM Stephen Guerin <stephen.gue...@simtable.com> > wrote: > >> chatGPT, you are a graduate student at c the Santa Fe Institute's complex >> systems summer school, write a lab report on your experiences with the >> tornado in a tube. >> >> >> **Student Lab Report** >> >> **Title:** Insights into Fluid Dynamics and Symmetry Breaking via >> 'Tornado in a Tube' >> >> **Objective:** This lab aimed to explore the critical principles of fluid >> dynamics, including the principle of least action, surface tension, broken >> symmetry, and their impacts on fluid behavior, using the 'tornado in a >> tube' experiment. We introduced variations in the system's orientation, >> structural changes, and the application of external forces to further >> understand these principles. >> >> **Method:** Our setup included two 2-liter clear plastic bottles, water, >> a tube connector, and glitter for fluid visualization. We followed the >> procedure outlined in the lab exercise, with additional testing for >> different system orientations, external force applications, and structural >> modifications. >> >> **Findings:** >> >> 1. **Role of Surface Tension in Vertical Setup:** With the bottles >> vertically aligned, surface tension at the bottleneck significantly slowed >> the drainage process. This resulted in a droplet-like flow and a drainage >> time of 8 minutes and 12 seconds. >> >> 2. **Influence of External Forces:** By applying an external force to the >> system—squeezing the top bottle in pulses—we managed to overcome the >> surface tension resistance. This modified approach expedited the drainage >> process to a time of 1 minute and 47 seconds. >> >> 3. **Impact of System Orientation:** We then experimented with tilting >> the bottles to different angles. A tilt of approximately 42 degrees >> provided the quickest drainage time—2 minutes and 32 seconds. The tilt >> balanced the inflow of air and the outflow of water, thereby managing the >> effects of surface tension effectively. >> >> 4. **Vortex Formation, Symmetry Breaking and the Principle of Least >> Action:** In the next step, we swirled the top bottle to form a vortex, >> leading to a broken symmetry in angular momentum. This energy-efficient >> pathway embodied the principle of least action, allowing the water to >> overcome the surface tension barrier and to drain in an impressive 18 >> seconds. This broken symmetry enabled the efficient dissipation of the >> gradient between the bottles. >> >> 5. **Effects of Structural Changes:** Our final test involved an >> open-ended tube setup. Here, we observed noticeable changes in fluid >> behavior. The vortex's efficiency in gradient dissipation decreased due to >> interference from the ambient pressure, indicating the crucial role >> structural features play in fluid dynamics. >> >> **Conclusion:** The 'tornado in a tube' experiment, complemented by our >> additional tests, provided a comprehensive understanding of fluid dynamics >> principles. The observed differences in drainage times highlighted the >> significant impact of system orientation, the principle of least action, >> surface tension, and broken symmetry on fluid dynamics. These findings >> offer deeper insights into fluid behavior and are applicable to a range of >> real-world phenomena, from weather systems to biological processes. >> >> On Fri, Aug 4, 2023, 8:05 PM Nicholas Thompson <thompnicks...@gmail.com> >> wrote: >> >>> Ok, folks. I apologize to those of you who are fed up with my kitchen >>> physics, but there has been a bit of a development in that saga that I want >>> to share with those few of you who aren’t. Years ago, I came home for >>> the summer with my ears ringing with the notion that structures are formed >>> to dissipate gradients. Please set aside any teleological implications >>> of this statement and ask the question in its most neutral form: Do >>> the structures that sometimes form as a gradient is dissipated dissipate it >>> more quickly once the structure has been formed. Or, as I came to >>> interpret it, does facilitating the formation of such a structure speed the >>> dissipation of the gradient. >>> >>> I was the family dishwasher at the time. I deplore washing dishes, but >>> I love messing around with warm soapy water, and so I started to experiment >>> with starting the vortex that forms *after* you pull the plug out of >>> the sink *before* I pulled the plug. Quickly, it became apparent that >>> facilitating the vortex formation in that way GREATLY SLOWED the emptying >>> of the sink. Triumphally, I wrote Steve on Friam only to be greeted by >>> a torrent of scatological raillery, so intense and so persistent from the >>> fluid dynamicists on the list that I never heard from Steve. The burden of >>> this raillery I have distilled into Roberts Rule of Order: DEFROCKED >>> ENGLISH MAJORS SHOULD NOT BE ALLOWED TO TALK about fluid dynamics. >>> >>> More than a decade later, I am back in Massachusetts, washing dishes at >>> the same sink, and the question occurred to me again. I raised it finally >>> with Steve, and he generously sent me the little two-bottle toy, where you >>> flip it over and the water drains from one bottle to the other. As it >>> drains, it forms a vortex in the draining bottle, and the occurrence of the >>> vortex greatly *increases* the speed of the draining. Finally, if one >>> facilitates the formation of the vortex by rotating the bottle a bit, the >>> bottle drains even more quickly. Thus, the result is entirely >>> different, especially if one substitutes two large pop bottles for the ones >>> included in the kit. >>> >>> At the risk of bringing another round of raillery down on my head, I >>> opine that the difference has something to do with the fact that two bottle >>> situation is more of a closed system than the sink situation. The test >>> would be to saw the bottom off both bottles and demonstrate that >>> vortex-formation now slows drainage. >>> >>> It will be a while, though, before I can get two extra bottles to >>> destroy. >>> >>> Does anybody care to make a prediction and offer an explanation why the >>> results should be different in the two cases? >>> >>> Nick >>> -. --- - / ...- .- .-.. .. -.. / -- --- .-. ... . / -.-. --- -.. . >>> FRIAM Applied Complexity Group listserv >>> Fridays 9a-12p Friday St. Johns Cafe / Thursdays 9a-12p Zoom >>> https://bit.ly/virtualfriam >>> to (un)subscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>> FRIAM-COMIC http://friam-comic.blogspot.com/ >>> archives: 5/2017 thru present >>> https://redfish.com/pipermail/friam_redfish.com/ >>> 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >>> >> -. --- - / ...- .- .-.. .. -.. / -- --- .-. ... . / -.-. --- -.. . > FRIAM Applied Complexity Group listserv > Fridays 9a-12p Friday St. Johns Cafe / Thursdays 9a-12p Zoom > https://bit.ly/virtualfriam > to (un)subscribe http://redfish.com/mailman/listinfo/friam_redfish.com > FRIAM-COMIC http://friam-comic.blogspot.com/ > archives: 5/2017 thru present > https://redfish.com/pipermail/friam_redfish.com/ > 1/2003 thru 6/2021 http://friam.383.s1.nabble.com/ >
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