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Heatpipes......Do they REALLY work? - Page 2

post #11 of 37
So what about the Zalman VF900 on a gfx card? The entire cooler is pretty much always upside down...
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post #12 of 37
It's not that simple, and you have to keep in mind that IT IS the best way when the heat-pipe works as hottest point lowest and the cooling highest. Otherwise it relies on capillary action.

Here is some more info:
Quote:
Originally Posted by Click For Link
  • Vertical orientation required - In our simple model heat pipe, the working fluid simply drips back to the heat source. It is quite obvious that this design will only work in vertical orientation. To overcome this limitation, commercially available heat pipes do not rely on gravity alone to move the liquid back to the heat source; they take advantage of capillary action. The inside of the heat pipe tube is filled with a capillary structure, often referred to as wick.

    Different structures are being used:
    • The most simple structure is a grooved tube. Here, capillary action merely helps gravity; vertical orientation of the heat pipe is usually still required.
    • Most commonly used, due to better capillary action, is a multilayered metal mesh.
    • Sintered powder capillar structures allow the stronges capillar action, but are more expensive to manufacture. Even with this design, performance of the heat pipe still depends on the orientation, and upside-down operation usually still isn't possible.
    
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post #13 of 37
Thread Starter 
so to be the MOST effective, you should have it in a vertical position? i wonder how much gravity is working aginst the heat pipe when its on its side?
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post #14 of 37
Simply put, quite a bit. I got about 10c on the VF900cu's on load when i layed my case down, and the cpu on load went down about 4 c.
    
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post #15 of 37
Thread Starter 
^^^ I took off that crap ASUS (stick to making boards) heatsink and my temps went WAY down. I think it was a combo of crappy fan and the heat pipes
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post #16 of 37
Think of it like this. When you swallow food, it doesnt matter whether you are upright or upside down, the food still travels into your stomach. Once the liquid evaporates, it'll go whever it needs to get out of the pipes
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post #17 of 37
Thread Starter 
^ OK but your not as efficent when your digesting food upside down, gravity is working aginst you. Thats why i brought this up, my heatsink didnt work too well until i got one without the heat pipes. They do work, i am not questioning that (i konw the title is misleading), but how effective are they when they are horizontal? Oh yeah, and hot air does not have the assistance of muscles, hot liquid evaps up. IMHO, the capaliaries can only do so much. If you boiled water, you could pipe the evap down but it would not be that effective, it would still bottle neck at the highest point and evap there. I really dont know if i am right, this is just my theory.
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post #18 of 37
Eh if they are horizontal, that just means its moving slower to the fins. so yes you are correct under ideal conditions they will operate better vertically. But they are tested to run run sideways, also how does fluid move? or air? from high pressure to low pressure. Moving fluid has less PSI than still water, it also has less pressure, here is a link to explain bernoulli's principal in a little more detail.
http://www.ccmr.cornell.edu/educatio...x.html?quid=69
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post #19 of 37
My VF900 is mounted usipde as all GPU HSFs are and I still get 35C idle temps... I still have to see why I went fron 58C idle to 35C idle.
    
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post #20 of 37
Thread Starter 
^ Noice!
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