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SP-94, which way to orientate?
- Thread starter theTIK
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zer0signal667
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Heatpipes work by a phase change process, a liquid changes to a less dense gas which rises though the thubes to be cooled. I can't imagine how this would work very well in any direction bu upward, since the warm gas won't rise sideways or downward. Why don't you try it a couple ways and tell us the difference? I can only recommend that you have the pipes pointing upward though, so I assume no responsibility if anything fries.
Edit - Actually, i just looked at the thing, and I can't see how it would work well in any configuration besides having the motherboard lay flat on the ground... Good luck
Edit - Actually, i just looked at the thing, and I can't see how it would work well in any configuration besides having the motherboard lay flat on the ground... Good luck
Well, the installation instructions warns to NOT put them facing up. The pipes sticking out of the heatsink should be sideways or down. They have a pic of the pipes pointing up with a great big X on it.
The reason being, is when it turns to gas, yes, it rises but, when it changes back to liquid, it wouldn't be able to go up and over the bends if the HS was facing with the pipes up.
With the pipes facing down, the liquid can fall back down and push the liquid back into the heatsink area to remove heat.
Sideways is the ideal direction though and that's the direction it's in on my NF7-S.
The reason being, is when it turns to gas, yes, it rises but, when it changes back to liquid, it wouldn't be able to go up and over the bends if the HS was facing with the pipes up.
With the pipes facing down, the liquid can fall back down and push the liquid back into the heatsink area to remove heat.
Sideways is the ideal direction though and that's the direction it's in on my NF7-S.
zer0signal667
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Yah, I wasn't thinking that the tubes were U-shaped when I wrote that. But with the pipes down, how does the gas move downward through the tubes?
Well I just finished installing it (i had my friend make this thread because my pooter was obviously out of commission for the time being), and I have the ends of the heat pipes facing the front of the case. On the instructions this was the second best way (the best way was if your case was layed on its side).
Does the gas move from the flat part and up the curved "U" or does it flow from the U and out to the flat part?
As first I thought it would be best to have the gas flow up from the U, and have the ends up the heatpipes face up towards the power supply. but in the instructions, the say having it flat is the best, which leads me to believe the gas goes from the ends of the heatpipes and up the U.
Does the gas move from the flat part and up the curved "U" or does it flow from the U and out to the flat part?
As first I thought it would be best to have the gas flow up from the U, and have the ends up the heatpipes face up towards the power supply. but in the instructions, the say having it flat is the best, which leads me to believe the gas goes from the ends of the heatpipes and up the U.
You got me bud. I'm still not perfectly sure how it works, like you said, gas moving past the liquid but, I do know liquid doesn't move up without a pump or other method. Maybe the gas moves up through the liquid as bubbles, just like air bubbles in water.
Heat pipes do have a pump of sorts, where the pump action is provided by the heat input itself and the laws of physics.
The liquid vaporizes at the heated end (the evaporator), creating a pressure difference which forces the vapor down the channel to the condenser (where the heatsink/fan is mounted). Whenever a liquid is heated to vaporization, the heat input required to boil/vaporize it (the heat of vaporization) leaves with the vapor.
By exploiting this fact, this is how the heat pipe (and any other vapor-phase refrigeration system) transports heat from one end of a tube to another.
The vapor travels down the tube to the condenser, where it condenses to liquid and releases its heat of vaporization to your heatsink. The liquid then enters the wick, where it gets sucked back up the channel (by capillary action) towards the evaporator. The process is continuous, like the cooling cycle inside your refrigerator or Vapochill XE
For more information, consult any high school physics textbook.
Want some pictures? Check out Electronics Cooling Magazine (wtf there are magazines for everything) here: http://www.electronics-cooling.com/Resources/EC_Articles/SEP96/sep96_02.htm.
(edit) Sideways is the ideal direction to mount any heat pipe, because the device consists of both gas and liquid. If it was totally liquid, orientation wouldn't matter (imagine a siphon or a closed-loop water cooling system). However, due to the need for a gas space, the siphon effect can't take place (google for hydrostatic pressure). Capillary action might be strong over short distances, but it can only fight gravity so much
The liquid vaporizes at the heated end (the evaporator), creating a pressure difference which forces the vapor down the channel to the condenser (where the heatsink/fan is mounted). Whenever a liquid is heated to vaporization, the heat input required to boil/vaporize it (the heat of vaporization) leaves with the vapor.
By exploiting this fact, this is how the heat pipe (and any other vapor-phase refrigeration system) transports heat from one end of a tube to another.
The vapor travels down the tube to the condenser, where it condenses to liquid and releases its heat of vaporization to your heatsink. The liquid then enters the wick, where it gets sucked back up the channel (by capillary action) towards the evaporator. The process is continuous, like the cooling cycle inside your refrigerator or Vapochill XE
For more information, consult any high school physics textbook.
Want some pictures? Check out Electronics Cooling Magazine (wtf there are magazines for everything) here: http://www.electronics-cooling.com/Resources/EC_Articles/SEP96/sep96_02.htm.
(edit) Sideways is the ideal direction to mount any heat pipe, because the device consists of both gas and liquid. If it was totally liquid, orientation wouldn't matter (imagine a siphon or a closed-loop water cooling system). However, due to the need for a gas space, the siphon effect can't take place (google for hydrostatic pressure). Capillary action might be strong over short distances, but it can only fight gravity so much
zer0signal667
2[H]4U
- Joined
- Jan 11, 2002
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Originally posted by Foobar
Heat pipes do have a pump of sorts, where the pump action is provided by the heat input itself and the laws of physics.
The liquid vaporizes at the heated end (the evaporator), creating a pressure difference which forces the vapor down the channel to the condenser (where the heatsink/fan is mounted). Whenever a liquid is heated to vaporization, the heat input required to boil/vaporize it (the heat of vaporization) leaves with the vapor.
By exploiting this fact, this is how the heat pipe (and any other vapor-phase refrigeration system) transports heat from one end of a tube to another.
The vapor travels down the tube to the condenser, where it condenses to liquid and releases its heat of vaporization to your heatsink. The liquid then enters the wick, where it gets sucked back up the channel (by capillary action) towards the evaporator. The process is continuous, like the cooling cycle inside your refrigerator or Vapochill XE
For more information, consult any high school physics textbook.
Want some pictures? Check out Electronics Cooling Magazine (wtf there are magazines for everything) here: http://www.electronics-cooling.com/Resources/EC_Articles/SEP96/sep96_02.htm.
(edit) Sideways is the ideal direction to mount any heat pipe, because the device consists of both gas and liquid. If it was totally liquid, orientation wouldn't matter (imagine a siphon or a closed-loop water cooling system). However, due to the need for a gas space, the siphon effect can't take place (google for hydrostatic pressure). Capillary action might be strong over short distances, but it can only fight gravity so much
Ah, yes a wick would explain it