pumping something into heat pipes? - Page 2 - Overclock.net

azminisk8r · 02-26-08

wait, why not just get a pump, cut off the tops, and put water through them, like a watercooling block.

oh, and a small res. itd work as its own cpu block and rad.

xShiFTx · 02-26-08

Once you get that far why not just water cool it the traditional way?

azminisk8r · 02-26-08

Quote:

Originally Posted by xShiFTx

Once you get that far why not just water cool it the traditional way?

because pump + res is about 65$.

the worst watercooling loop worth buying, 200.

and plus, its always more fun to mod than to buy.

xShiFTx · 02-26-08

It'd definitely be something cool to try.. But not $65 cool.

Blameless · 02-26-08

Not cool at all.

You would still need a pump, and it would not cool anywhere near as well as the unmolested heatsink. You would not have enough water volume or surface area in the pipes for liquid water to cool the chip.

Nothing of that volume can transport more heat than a working heatpipe. Not copper, not sliver, not diamond, not flowing water.

Maybe liquid helium...

**Mootsfox** · 02-26-08

Quote:

Originally Posted by Chipp

Heat pipes work by allowing a liquid (called the working fluid) to evaporate, transfer, and then condense and return to the "hot side" to start the cycle over again. To open it and attempt to inject another liquid would be pointless, as a well-designed heatpipe transfers heat better than anything else we know of - and you would ruin the delicate balance set by the manufacturer.

More reading:
http://www.cheresources.com/htpipes.shtml

Wheres the rep button

Azazel · 02-26-08

It seems possible to make them better but you would have to design it on a case by case basis. You would have to work off your ambient temp and get/make a liquid that evaps slightly above that temp. You would need to think about how much space the stuff would take up in liquid and gas states to know the right amount to put into the pipes too + the area inside the pipes. The pressure of the gas+liquid would effect the evap temp once you have the heat applied also(if I remember correctly from chemistry, its been awhile). It is probably way to much work/math and I bet the gain would be very small if someone did do it.

Edit: I guess you could do it with other chemicals that evap below room temp also. You would have to freeze the stuff in tiny pieces and put them in the tube/seal it before they melted though. Anyone know what liquid is actually used in the heatpipes?

Edit2: I looked around researching this a little while and it seems the only things that could help it would be to use more dangerous chemicals like butane or something. You would have to know the area inside the heat pipe and figure out the pressure the pipe could handle. Then do math and figure out the right amount to put in. You would have to do all the work in a very cold area so the liquid wouldn't evap before you sealed the pipe too.

Duma · 02-26-08

Quote:

Originally Posted by Azazel

Anyone know what liquid is actually used in the heatpipes?

Water is the most common. At low pressure the boiling point can be brought into range.

General Characteristics of Heat Pipes

* Material: Copper
* Working Fluid: De-ionized Water
* Wick Structures: Groove, Sintered Powder Metal and Wire Mesh

Other materials are used from R-114 to alcohol, but they are "exotic" (more expensive).