Instructables
Picture of Turning Back Time with Reversible Laminar Flow
This is a nifty physics demo that was made popular (as far as I can tell) by John DeMoss and Kevin Cahill at the University of New Mexico. The apparatus used in the link is available for purchase for $550 (see linked video description). This is my attempt to make one for under $100. Going off of the original youtube video this is what I came up with and I am pretty pleased with the results:


 
 
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Step 1: Materials

This is what I used

Materials:
- Round wood for the base (It doesn't actually have to be round but I would recommend getting a piece of wood that is 1'' thick so you can cut pretty deep grooves with the Dremel)
- Clear Acrylic Pipes (I used one pipe with 6'' outer diameter and another with 4'' outer diameter)
- Piece of wood for the handle (I used the long darker piece of particle board that I found in a scrap pile but anything will do)
- Gorilla wood glue
- Silicone sealant (not pictured)
- Corn syrup
- Food Coloring
- Cups & Straw

Tools:
- Dremel
- Drill with 4'' circular bit
- Hack Saw
- Clamps

Notes:
If you have access to a laser cutter or a 3D printer I would recommend using those tools to create a much more precise base and handle for this apparatus. I am convinced that if I had a handle that I could have turned with out shaking the whole setup as much as I did then the final result would have came out better. That being said you can achieve pretty amazing results with the setup that I have here so if all you have is a drill or a Dremel don't be discouraged!

TomGoff1 year ago
great instructable, as a practical use I often use lamella clarifiers to separate solids and clean-up waste water
chaydgb1 year ago
This is brilliant! it's like; "Screw you, entropy".
hahahahaa
I agree!
I've seen this demo several times, since I was very young, using a variety of fluids though I'm pretty sure they were mostly oil based when I was at school.

FYI, "Corn Syrup" seems to be a peculiarly American product, and I've never seen it available in the UK, but it's obtainable as"Glucose Syrup", which can be bought from a Pharmacist if you can't find it anywhere else.
That doesn't surprise me. The U.S. has a ridiculously out-of-control corn-growers lobby and subsidy system and, as a result, farmers grow a lot of corn that's been engineered to be either animal feed stock or a substitute for sugar cane.

Hence why High-Fructose Corn Syrup (HFCS for short) is ridiculously common in processed goods in America.

If you can find it, there's a good documentary on the topic named King Corn.
There's also "Food Inc.", a very interesting documentary about the American food industry. Have you seen that? Horrifying...
I'm not sure. I've seen several but I'm having trouble matching names to memories.

I do know that, if I haven't seen it, it's on my TODO list.
bwelkin1 year ago
This is amazing and I will be building one for our home school coop science class.

One question though: why do you need syrup in the inner cylinder? Aren't you putting the colored syrup between the inner and outer walls?

Thanks.

...bwelkin
ExperiencingPhysics (author)  bwelkin1 year ago
Syrup isn't necessary on the inner cylinder... I just noticed that when I didn't fill the inside with syrup it was harder to see the mixing on the other side of the inner cylinder. I also didn't make an attempt to seal the bottom of the inner cylinder so some syrup would always leak in. After a couple of runs I just let the inner cylinder fill up completely and it yielded the nicest result so I stuck with it. Good luck building this for your home school science class and feel free to contact me if you have any more questions.
oilitright1 year ago
Fluid dynamics is witchcraft.
Exocetid1 year ago
Just love, love, love science!!!
RedBinary1 year ago
Awesome job! I've always wondered if that could be reproduced DIY & you answered my curiosity!
I was curious about getting Corn Syrup in the UK-this is info I found-"Corn Syrup is not Golden Syrup, Golden Syrup is made from sugar cane.
But yes, corn syrup is widely used in the country by food manufacture and you can buy it in large supermarkets like a big ASDA and in Health food shops. Waitrose sells the light and dark variety from the company KARO.
Corn syrup is not responsible for obesity or diabetes, its the people who eat in in enormous amounts who are responsible for that." This was found on ASK, and did include sources: http://bakingbites.com/2008/09/corn-syrup-vs-golden-syrup/
and http://www.ocado.com/webshop/getSearchProducts.do?clearTabs=yes&entry=corn+sirop&dnr=y
Just wanted to give you a source!
The UK info was supposed to be a reply to Dream Dragon...I don't think it was paged that way, tho!
kelseymh1 year ago
Awesome demo, and much less expensive than the "typical" apparatus!
ExperiencingPhysics (author)  kelseymh1 year ago
Thanks! I am glad that you appreciated the demo
I'm 66 years old and have had an interest in science and technology for all of those years, BUT, never in my life have I seen a demo that made my eyes pop out quite as much as this one. THANKS!!!
ezarate1 year ago
This is.....this is......black magic

BURN IT WITH FIRE!?
utilito1 year ago
What kind of whitchcraft is that???

Bring me my Excalibur and report this to the admin!

Consider yourself on my sight Mr ExperiencingPhysics, I will hunt you down, sooner than later, swear on my kingdom freedom you will be taken down and will show no mercy for this attemp against the All Mighty.

Never saw anything like that before, Nice ´ible.

look the way to encrypt data into DNA´s chains, by deploying it and bring it back to the minimum expression.
he used 5 rotations counter clockwise, and 5 clockwise. there are 12 hrs on a clock face. 12X5 is 60 X 10 for both rotations forward and back is 600, plus the other 12X5 is 60 to bring 660, then add 6 for the 6 letters in physics and you end up with the mark of the beast!
Orngrimm1 year ago
I have seen this online a good time ago, but their setup was much more complex and had tighter spacings... They also didnt gave such a nice 'ible to make your own. :)
TheGreatS1 year ago
So Cool!