Re: Question about Capillary

[khuong]

thank you very much! I have a question about capillary tube. I want to get more information about it. Can you help me?

[The MG Pony]

it's a tiny tube that comes in differant sizes, and is made of copper?

with out a bit more detail thats about all I can give ya!

[nike123]

http://tinyurl.com/22c6t

[Brian_UK]

Excellent link Nike, thanks I might have to use it myself sometimes.

[brunstar]

the length and bore is very important..

[Chunk]

Thanks Nike it was a very usefull link

[nike123]

Thanks Nike it was a very usefull link

I am sure that it will be very beneficial in many cases.

[scrapen]

You can also look up Heat Pipe

[dogma]

Capillary action, capillarity, capillary motion, or wicking is the ability of a substance to draw another substance into it. The standard reference is to a tube in plants but can be seen readily with porous paper. It occurs when the adhesive intermolecular forces between the liquid and a substance are stronger than the cohesive intermolecular forces inside the liquid. The effect causes a concave meniscus to form where the substance is touching a vertical surface. The same effect is what causes porous materials such as sponges to soak up liquids.

A common apparatus used to demonstrate capillary action is the capillary tube. When the lower end of a vertical glass tube is placed in a liquid such as water, a concave meniscus forms. Surface tension pulls the liquid column up until there is a sufficient mass of liquid for gravitational forces to overcome the intermolecular forces. The weight of the liquid column is proportional to the square of the tube's diameter, but the contact length (around the edge) between the liquid and the tube is proportional only to the diameter of the tube, so a narrow tube will draw a liquid column higher than a wide tube. For example, a glass capillary tube 0.5 mm in diameter will lift approximately a 2.8 mm column of water.

With some pairs of materials, such as mercury and glass, the interatomic forces within the liquid exceed those between the solid and the liquid, so a convex meniscus forms and capillary action works in reverse.


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[The MG Pony]

You can also look up Heat Pipe

Uhm NO, thats simple shortest answer.

[yorkie]

used as a metering device for refrigeration systems. controls the superheat, discharge superheat of compressors and also governs the performance of a system. very hit and miss. Cant just be changed to get more cooling performance by just the length, the internal bore is also very important.