Doctor:So what did the patient get ? Nurse:He got third degree burns in his palm and fingers . I have no idea how he did that ! Patient:Well, I made a frying pan out of a heat pipe and cooked some eggs ...
Oh my goodness, this was such a well made video/demonstration. The way you used the pad that shows "coldness " (thermal energy) to demonstrate how much better the heat stick is than copper really put it into perspective. You're an incredible teacher and person!
Diamond is really good at conducting heat as well, I went to a science demonstration where they had a large block of ice and a small blunt knife made of synthetic diamond, it cut through the ice in a very similar way to the rod in this video
Diamond is an excellent thermal conductor, I believe it's due to the crystalline structure of the carbon within. Diamond which has a more well structured crystal lattice works even better, but you'll be hard pressed to find such a diamond naturally.
I knew about heat pipes, from knowledge of computer hardware, *_but_* this demonstration was amazing. This video was on another level, and it made the effect very obvious. And the explanation also contributed to my knowledge.
It's the fastest because it's not just conduction, it's evaporation, condensation and convection. In the solid copper rod, the copper never moves. However, in the heat pipe, the water on the wick is a working fluid that moves through the center of the pipe, which is a region of pure water vapor.
These copper water heat pipes are used in a lot of smartphones(not on iPhones) recently to help in efficient heat dissipation. It's a bit of the different design made according to the smartphone body. In a few teardowns, you can see the water evaporate as the person tears through the pipe. It's really cool. Finally got an idea about how it works😃.
@@rrsharizam What? That's not obsession, that's an example of the heat pipe application we see everyday. Did you comment on this using a nintendo? Everyone uses a mobile phone.
Great video! The visual testing was amazing. I always wondered why they just didn't use a solid copper pipe, I always assumed if the copper was hollow to reduce material and save money.
@@threepe0 instead of small surface area at the outside like heatpipe, usually vapor chamber has a wider area so the heat will spread more evenly and faster
Adding on to this: the "spongy" texture of the inside of the pipe is there to increase the surface area on the inside, thus also greatly increasing the temperature transfer
@@edwardbrant12 its actually a copper powder, if you interested at how it made, here's the video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-p71V6zLybig.html
No. It's because the liquid water gets spread to the entire inner spongy lining. A smooth surface will create a drop of water that will move here and there due to gravity and won't boil on the application of heat on the other side so, it won't work.
Also the spongy part act as a capillar bringing the condensed water from the cold side back to the hot side, where it evaporates and goes as vapor through the middle of the pipe. Creating a closed cycle. Just my guess, I am actually an idiot.
I've repaired hundreds of laptops and always wondered why many looked like hollow tubes crimped at the ends. I suspected increased surface area but after your fantastic video it all makes sense :) WD!
Pro tip: you may want to get a small vise, the kind that clamps on the edge of your table, or a Panavise kit if you're being fancy. It's much easier and safer to cut with a Dremel when the workpiece is held securely. (You do wear eye protection when using a cutting disk, right?) edit: I just noticed this video is almost two years old, but never mind...
Who cares, if the content creator chooses to be unsafe its of no concern to us VIEWING through a device were nothing can happen to us! And if there is anyone who actually is dumb enough not to follow safety precautions their better off not in the gene pool.
one very big issue here is that you're using a rod vs a pipe, it would be much more interesting to see the heat pipe vs a hollow copper rod, due to the difference in mass and thermal capacity.
dahahaka while you are correct about a vacuum having lower thermal conductivity than copper, the heat pipe has a small amount of water in it which in the lower atmospheric pressure in the pipe boils at a fairly low temperature. The water boiling in the warm part of the pipe turns to vapor and condenses at the cooler end of the pipe, which transfers significantly more heat than air or copper would. It’s actually some what similar to the way an air conditioner or refrigerator works.
This guy is a genius. I have been roaming all around you tube the whole day watching car races, bike races, huge trucks blah blah( came here at 10am now it's 11:35pm) East african time (Uganda) skipping his videos and I just clicked on his video as I go to bed ( because I like to concentrate on things that matter before going to sleep) and I felt so at home. He is so calm, and explains everything so well. Am glad to be subscribed to this guy. Honestly am one proud subscriber of The Action Lab. Thanks brother for all the videos. I learn a lot everyday from them and I was a science student in my high school ( BCG/A) Biology, Chemistry, Geography and Agriculture. I dropped out before uni(life is tough down here) but I feel so happy being here. Thanks a bunch .
One drawback: once all the water has moved from the hot side to the cold side, the thermal conductance of the tube reverts to that of a hollow copper tube. Of course if the hot and cold sides are subsequently reversed, the conductance dramatically increases again, but only temporarily. In this sense, the tube doesn't act like a super-good conductor of heat long-term in one direction or the other.
That's why the wicking process is so critical, to the continuous flow of heat from a source to a sink. That's what returns the condensed liquid back to the source of heat, and is the limiting factor to how fast heat can be transferred. It would be easy, if the heat source is below the heatsink, because gravity would just drip the condensate back to the bottom. Wicking is required, if the heat source is level with, or even above the heatsink. That's why the inside of the tube is rough, so the capillary effect can wick the condensed water back to the heat source, after it has evaporated.
@@vincentrobinette1507 That's a good explanation. From looking at the specs of the best heat pipes (those with a sintered internal wick) the skinny pipes really are about 100x the conductance of solid copper of the same volume, and at low power densities, heat pipes continue to operate at that high efficiency indefinitely. At higher power, the efficiency may be reduced, depending on the tip angle, and at still higher power, the efficiency goes way down, even if horizontal. (Note that in the video, that size of sintered-wick heat pipe would probably rapidly go into inefficient operation if maintained at ΔT= 30°C, the approx difference between the hand and ice, but the warm end probably cooled rapidly to about 4°C. There was probably a rapid melting of the ice initially because the warm end started at hand temperature.)
I knew that heat pipes are a better heat conductor than even the best solid conductors, but i did not expected it being that rapid!!!! 😮 Thx for the demonstration! Next time i have to cool somthing, i will take heat pipes more likely in consideration!
opened pipe gonna react just like a normal cooper pipe, there's no difference between opened pipe and normal copper rod, the water is the magic in the heatpipe
@@utiantew Then someone was feeding you BS. High heat conductance of heat pipes is based of evaporation absorpting lots of thermal energy. With movement of gas then transferring that energy fast to cold end, where condensation releases that thermal energy.
@@tuunaes What he's referring to is a wick used to soak the condensed water back to the heat source more quickly than the copper powder that is sintered to the inside of the pipe. I have wondered if a woven glass fibre wick might make it more efficient because the relatively straight-ish glass fibre bundles would wick water much faster than the tortured path of water being soaked along the copper powder. If you see water soaking up a bundle of glass fibres it's extremely quick
They are using nanofluids to replace pure water. Studies have shown big increases of efficiency and conductivity. There's also new materials they are using for the "wick" which also does the same thing. I am not sure if these techniques are being used on a wide scale yet or not, but I imagine it will catch on.
Alright this is absolutely fascinating. I was expecting some kind of alien material with insane properties. I'm sharing this with all my nerdiest friends
You obviously dont know anything about pc hardware. This has been used in most cpu heatsinks for ages. Vapor chambers work better but its a shape thing. Its just crazy to think that the vapor inside moves faster then the speed of sound
I thought the "bad" heatpipe he was holding was the regular sintered copper tube and the "better" one had some rare and expensive material inside it. If you already know about these heat pipes then this video is disappointing.
Screw those bastards who are making fun of you for cutting ice if you want to do that you can. Dont feel ashamed just cause some haters told you you act like a kid.
Thanks alot for this informational video. I always found it intuitively unlogical that those high mass cooling surfaces are connected by thin copper tubes. I thought without deeper knowledge that copper shouldnt be able to transfer enough heat quick enough with those low radii. I didnt knew those things existed. Such a genius heatpump. Im amazed.
Something interesting related to this video is superfluid helium (I believe helium IV). It's a form of liquid helium that transfers heat almost instantly, it's very interesting. So technically, superfluid helium IV is the stuff that transfers heat fastest
you know, you help me open my mind up and make it super fun to think about stuff from a scientific standpoint and make me question things not only on a basic level but also on a level to where i look at more acute details even with everyday things/objects. some say you overthink about things, on the contrary i'd say you are not looking at with curiosity.. thanks for the lessons because I want to learn NO MATTER WHAT IT IS.
I want to thank you for the amazing information you provide to your viewers. This is fascinating material. I appreciate all of your efforts. Many thanks!
I wonder if you could incorporate these to make a more efficient Stirling engine or peltier cooling system. I'd love to explore some new experiments with this.
When you used your hand to heat them. It's interesting that the head pipe warms and cools faster, but the standard pipe radiated the heat further away from it's self than the head pipe.
Someone actually used a pipe made of this stuff to cut a hole in the ice to study it. It made it so it wouldn't melt the ice and ruin the experiment Edit: I found the vid m.ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dQw4w9WgXcQ.html
This is essentially the core operating principal of all modern cooling. HVAC and AC units all operate using a long network of copper tubes filled with a vapor that it highly sensitive to temperature changes, by applying heat to one side of this network you make the other side very very cold, if you blow a fan over the cold side you have an air conditioner unit.
This the second video out of two videos of yours back to I back combined with the idea I came up with for retractable 🔭 telescopic blades & aircraft carrier cable to be used on wind farms inspired by watching videos of them structurally failing and decided to donate some time to help these engineers tackle this issue for safety and longevity. You have a wonderful scientific mind that can be a valuable asset with their production of a solution. Good day.
Here's the first video that may solve the problem for *the* *runaway* issue with the magnetics locking up and for not locking. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-V5FyFvgxUhE.html So that video solves that problem because they say they don't have a clutch so now I'm thinking engineering up a magnetic torque converter.. similar to what we use in automotive rather than a fan clutch.
Search for "thermochromic" or "thermochromism." There's all kinds of products with this feature. Video featured a plastic thermochromic film. (Thermo = heat, chromism = changing color.) Thermometer strips for foreheads or aquariums use the same technology.
So I think I'm noticing a potential drawback of this device. Isn't it true that it's thermal conductivity would have to be lower at very cold temperatures? Say if you're significantly below the triple point temperature of water, like -40C, then the vapor pressure of the ice would be so low that the vapor cannot transfer as much heat to the other end, yes?
This is precisely why I suspect that the working fluid might be methanol, or some kind of alcohol, or even dichloromethane. These fluids work well below the freezing point of water, as long as the condensate will wick effectively back to the source of heat. Even if it IS water, if the temperature is that cold, the temperature protected component still won't get that hot. If it does, the water turns back to liquid, allowing the heat flow system to resume normal operation. Remember, it's vacuum packed, so water will freely evaporate and condense, at any temperature, with changes in vaporization pressure. The interior is always under a vacuum, unless the whole heat pipe gets up to, or above 212 degrees, in which case, there is no pressure difference, or even slightly positive pressure.
Yeah, but it's not typically used under those conditions. It is typically used around room temps to a heat source that may vary between 100 to 200 F. Water has a higher heat capacity than methanol and many other, non exotic fluids. It is very good at transferring heat via the liquid--vapor--liquid cycle. Sure, if you lived in Siberia or the like, and were using this tech outside, then yeah, go with an alcohol or the like. But for most conditions, most of the time, water works very well. As far as I know, most of the heat pipes made and sold to the public use water as the phase change material. Maybe the military and the like use different and/or more exotic materials for some applications?
This is such an interesting material and its incredible to me that simple water and copper make an extremely efficient thermal conductor. I wonder what the maximum length of it is before it becomes only 10x better than copper
This would be excellent for geothermal transfer. I've heard that it's possible to drill a couple miles down anywhere and stick ultra-efficient conductors in the hole, allowing for boiling water using earth's heat energy. I think exotic materials blended with this concept could pull it off.
sure if you want to cool down the earth eventually. Heat vents are okay, since the heat is escaping and wasted but drilling to the core and stealing that heat? That could have future consequences.
@@jerryblue017 Agreed. But on a smaller scale, and at much shallower depths, this could be used to good effect in combo with geothermal for both heating and cooling.
The only way those materials would work better, is if they are more hydrophilic, and would wick the working fluid back to where the heat is more quickly. This is a vapor phase change system, using the latent heat of phase change from a liquid to a gas, and condensing back into a liquid. Otherwise, silver would be best, if it were just a solid rod, or tube.
@@YbsGaming I take it you don't understand the latent heat of phase change during evaporation and condensation in the absence of a non condensable gas. You're also having a hard time understanding how the wicking effect could return the condensate back to the heat source, using the capillary effect created by the rough interior of the heat pipe. Without those basic understandings, it's very difficult to grasp the concept.
I was waiting to hear what magical liquid was inside this pipe, and I was so surprised to find out it’s just water! It’s interesting how changes in pressure can do so much.
@Lalrivunga Hnamte it is not about the video, the context is in comments. Root one asked about both, rod and paper, then someone mentioned paper could be bought, then you mentioned it can be made at home, and that is the point where i was interested in: how could you make thermopaper at home. and no, it is not that easy to create such a surface on the inside of the copper tubing. Sealing the vacuum with a little water inside it would be easier, but not much, as we need very specific pressure of water vapour in the tube after sealing. But if it was about thermal paper, i thought, you might just know some chemical available in food or chem store
too bad you don't clarify the name of materials you use . the "thermal paper" - what is it called? where can I buy it ? same with a later magnetic filed indicator ...
If you could somehow utilize this is a thin,flat surface,you could use it to help with other applications. Something small you could do is possibly utilize it in a cooler as well as to keep warm food or materials warm. Idk how it would work for using it on more advanced applications such as tanks,planes, spacecraft etc. You could also utilize it to help displace thermo signatures for soldiers out in the field. I'm not too smart to figure these things out haha but I can at least speculate and try to come up with some ideas on how this could be used.
Well if you want really high voltage and current it'll probably explode and be a very big hazard to anyone near by without proper precautions. It's better to just keep the voltage low and run high amps though it. It'll get glowing hot and melt till the circuit is open, nothing too spectacular.
@@gogo311 High voltage plus high current. We are implying that if we put enough through it, what would happen. So yes if you put what is going through high tension power lines then the heat pipe would violently explode.
@@jarhead1145 Voltage does not cause a conductor to heat, only current flow does. One billion volts at one ampere has the exact same effect as one volt at one ampere on heating the conductor. High-tension power lines often carry hundreds of amps, which would pop that tube like a blown fuse. Their voltage is irrelevant.
Thanks for another interesting video. And I must say that although I was quite familiar with both the concept and construction of heatpipes, I don't think I've ever seen any demonstration of them that matched Yours in how simply yet effectively it demonstrated the function and efficiency of heatpipes. That being said You could have added a bit about the "whicking function" of the sintered ((spongy)) copper on the inside. Best regards
