Bystander,
I definitely have done my due diligence search-wise, even exact phrase matches like you've provided. Either it returns a paper written on the subject (instead of actual PAPER as the material). I have also looked at several videos but to no avail. I hope I haven't overlooked what...
Hey there!
I'm about to do some tests with rotating boundary layers and wanted to use rotating sheets of paper (cut into circles) as this would be ideal for my experiments.
I was researching various materials but couldn't find yield and tensile strengths for different types of paper (printer...
Thank you Jim and berkeman for the replies and assistance, it's been helpful. I've been reading about mH inductors and some other LC tank designs but my background is programming. As for simulation 'software', I have been using an electrodynamics Java applet that simulates what I'm hoping to...
Thank you for the response berkeman, it gives me hope this might be a possibility.
To the best of my knowledge I would say somewhere between 5 mT to 50 mT (something comparable to a bar magnet or even a small neodymium magnet if possible). The test volume would be about 3-4 cm3. If these...
I was wanting to build a very high frequency electromagnet to test an idea and it requires something in the range of about 1-10 GHz, and I'm unable to find much information on what I'm attempting to do. I understand the impedance will be incredible, along with some other technical issues. Most...
mfb,
Thank you for taking the time to reply. Your answer makes a lot of sense. I was just confused for a while as it seemed weird having non-instantaneous action / reactions. It seems the electromagnetic field makes it possible.
This is not a homework question, but I read elsewhere that questions for self-study were required to be placed in this section.
I had a question that pertains to the non-instantaneous transfer of information (limited at the speed of light, c) and how it would work in a thought-experiment...
Nidum,
I was afraid it might become unstable near the burst speed. Instead of building the device, I think I'll steer more towards CFD just to be safe. I'm not sure how accurate it would be since there's a lot of wiggle-room with boundary conditions and mesh refinement, but with all the...
Thank you for the information. A very similar equation I presented was found on page 752 of a PDF version of the book I found regarding the burst speed. Safety will be a priority when doing these tests. Thank you for the information again!
The eventual purpose is to study the boundary layer...
Hello everyone!
I was wanting to know if something like this was possible. I read (Wikipedia) that the moment a cylinder will burst is when the hoop stress is equal to the cylinder's tensile strength. It also appears that the thickness of the material doesn't matter. I don't see Young's...
JBA, good points again. It seems there is a lot more at play here to investigate and consider than I initially thought (as is with most things!). I will definitely consider these points when thinking of new designs. I can't thank you enough for taking the time to explain the information in...
That's a very good point JBA. I also wonder if there would be a slightly lower pressure region at the bottom point where the discs diverge that creates a low pressure region that would affect the outflow as well (even with the bottom shrouds). Do you think a more efficient approach would be to...
Hopefully that is the plan, but I'm not sure it will create enough lift to take off. I agree with using something very light. I think by using discs as thin as possible and spaced closely will increase the surface area, but the weight may go up. I'm not sure. As it may work with multiple...
Rootone,
Thank you for your insight. I don't believe it would be particularly efficient either, but I thought it would be interesting to explore as it would be fairly cheap to test/build and seems to be unique. If one were to test this, what would be a good material to 'grab' the air with...
I was researching Telsa turbines and was intrigued by the bladeless design where gases drag on the discs by means of viscosity and the surface layer adherence. As the discs are rotated by the gas, the gas slows down and exits through the center of the disc.
I was wondering if we had two shafts...