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Heat pipes!!!!! - Page 4

post #31 of 53
Loving this thread. It's almost surreal.
    
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post #32 of 53
Thread Starter 
The point of this thread was to get advice on how to make one. Here is my complete plan.
I want to make heatpipe that may not be great and will just work a little. Then after that i want to start up a science fair form for are school for next year. when they ask how much money i need the first pipe i make will give me a insight to how much it will cost. The goal of this project will be to make a cheap and decent working heatpipe. You may think this cannot be done but some kid here a few years back made a table top nuclear reactor and who would have said that could not be done.
Once again i am not trying to make the next great heatpipe. calm down.
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post #33 of 53
Quote:
Originally Posted by Mootsfox View Post
What he said.

If you decide to make some though, post a log, a lot of us would like to see it.
I'll 3rd that.
post #34 of 53
Thread Starter 
Before i post up a log i want to know some of the smaller details.
How thick should the copper be or should it vary as it goes up.
i do not want to bend it so could i just put in grooves on the side to let the liquid go down.
should the insides be under a vacuum to help lower the vapor point? does the vacuum really help it lower it vaporizing point?
unfourtantly due to some butt heads breaking the vacuum chamber i cannot use it cause it is broken. when i get home in one week (hooray!!) i will test all these and post up a log. a log right now would be a waste.

P.S
To the Rider What do you mean?
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post #35 of 53
Quote:
Originally Posted by it is crysis time!! View Post
Before i post up a log i want to know some of the smaller details.
How thick should the copper be or should it vary as it goes up.
i do not want to bend it so could i just put in grooves on the side to let the liquid go down.
should the insides be under a vacuum to help lower the vapor point? does the vacuum really help it lower it vaporizing point?
unfourtantly due to some butt heads breaking the vacuum chamber i cannot use it cause it is broken. when i get home in one week (hooray!!) i will test all these and post up a log. a log right now would be a waste.

P.S
To the Rider What do you mean?
To answer one of your many questions, yes, a vacuum does lower the vaporization point. The reduction in pressure allows for a lower boiling point than standard conditions. The more vacuum (ie lower pressure) you achieve the lower the boiling point. Your 'sciency' friends should be able to help you more.
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post #36 of 53
Thread Starter 
Quote:
Originally Posted by alexgheseger View Post
To answer one of your many questions, yes, a vacuum does lower the vaporization point. The reduction in pressure allows for a lower boiling point than standard conditions. The more vacuum (ie lower pressure) you achieve the lower the boiling point. Your 'sciency' friends should be able to help you more.
I never said these people were my friends they are to competitive to help and have their head to far up themselves to help.
So what about the wall thickness on the sides and bottom. Should the sides taper thicker to thinner so when the coolant in the grooves going down does not evaporate before it gets up to the top? If it is thicker at bottom the heat will be hot enough to vaporize the coolant and as it goes up the walls get thinner then it goes to where the fan will be cooling it the walls will be thinner so it liquifis when it gets to the top and when it get onto a domed top goes down grooves in the side back to the bottom?
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post #37 of 53
Quote:
Originally Posted by it is crysis time!! View Post
I never said these people were my friends they are to competitive to help and have their head to far up themselves to help.
So what about the wall thickness on the sides and bottom. Should the sides taper thicker to thinner so when the coolant in the grooves going down does not evaporate before it gets up to the top? If it is thicker at bottom the heat will be hot enough to vaporize the coolant and as it goes up the walls get thinner then it goes to where the fan will be cooling it the walls will be thinner so it liquifis when it gets to the top and when it get onto a domed top goes down grooves in the side back to the bottom?
I would say theoretically you want it to be thicker at the bottom, thus creating not only an easy path for the condensed fluid to wick down, but also to maximize surface area where your heat is dissapating. But i'm not 100% sure, i'm no engineer (yet). So yes, i think you are correct.

BTW i like how politely you put "they have their heads too far up their asses" .
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post #38 of 53
Thread Starter 
What does. I do note people i do not really fit in at this school. I like science and all but my idea of fun is not getting to together with friends and doing math and researching history. My idea of fun is actually doing something with that math and science. And shooting, fishing, lax and chillin with friends.
To do would water work because if it is a vacuum in side wouldn't water vaporize faster? or4 should i stick with ethanol? And lets say vertically it works what would be a good wick if i were to try and make a bendy heat pipe?
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post #39 of 53
Quote:
Originally Posted by it is crysis time!! View Post
What does. I do note people i do not really fit in at this school. I like science and all but my idea of fun is not getting to together with friends and doing math and researching history. My idea of fun is actually doing something with that math and science. And shooting, fishing, lax and chillin with friends.
To do would water work because if it is a vacuum in side wouldn't water vaporize faster? or4 should i stick with ethanol? And lets say vertically it works what would be a good wick if i were to try and make a bendy heat pipe?
Ask your teacher to explain the Ideal Gas Law and state equations. Otherwise, you'll end up spend a LOT of time trying to empirically derive the ideal working fluid and amount.
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Once again...
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post #40 of 53
Quote:
Originally Posted by it is crysis time!! View Post
What does. I do note people i do not really fit in at this school. I like science and all but my idea of fun is not getting to together with friends and doing math and researching history. My idea of fun is actually doing something with that math and science. And shooting, fishing, lax and chillin with friends.
To do would water work because if it is a vacuum in side wouldn't water vaporize faster? or4 should i stick with ethanol? And lets say vertically it works what would be a good wick if i were to try and make a bendy heat pipe?
Water is not a good idea. I did a quick calculation, and in order to get water to vaporize at 50 deg C, you would need to lower the pressure to roughly 6.9 kPa, or 7% of normal conditions! At that pressure difference you are just asking for trouble IMO. Visit one of your chemistry teachers and see if you can find a chemical with the highest specific heat capacity possible, paired with a boiling point of around 50 deg C (or whatever you're cores load at - some number). This project you're looking at is going to be difficult, because the information you're looking for is hard to find, but if you talk to some of your teachers, they can probably point you in the right direction.

Yeah, some people have the weirdest ideas of fun. Back in high school there was one kid who would study during each and every lunch, even if the next test was weeks away.
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