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A heat pipe is a heat-transfer device that combines the principles of both thermal conductivity and phase transition to efficiently manage the transfer of heat between two solid interfaces.
At the hot interface of a heat pipe a liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface. The vapor then travels along the heat pipe to the cold interface and condenses back into a liquid – releasing the latent heat. The liquid then returns to the hot interface through either capillary action, centrifugal force, or gravity, and the cycle repeats. Due to the very high heat transfer coefficients for boiling and condensation, heat pipes are highly effective thermal conductors.
Uses
Electronics Cooling
These pipes are used to cool transistors and high density semiconductors. These high performance components get heated very easily but these heat pipes cool them down by transmitting cold air.
Aerospace
State of the art satellites and outer space crafts use these pipes as well. Shuttles are fitted with these pipes for better air density consumption.
Heat Exchangers
Heat exchangers are generally found in factories and industrial power plants. Industries use heat pipes to transfer gas between heaters and boilers.
Types
Thermosyphon
This is a gravity assisted heat pipe. Gravity is used to condense water and evaporate it into vapor. The condenser is located above the evaporator in the gravity field. This helps for easy transmission of liquid.
Leading Edge
This type of pipe is found in automobiles. It is specially designed for modern hypersonic vehicles. It increases air intake and gives you a better driving experience.
Rotating and Revolving
These pipes provide thermal solutions through their rotating motors. They condense the returning vapor through the centrifugal force. Turbines and other electric machinery have these pipes.
Cryogenic
This is a low temperature heat pipe. It is very subtle and is used to cool optical instruments in space. It is a specially designed pipe that can sustain pressure even in space.
Advantages
Thermal Conductivity
One of the key benefits of these pipes is that they are excellent thermal conductors. Less temperature difference is needed to transport the heat as compared to other materials. Another thermal solution that it provides is low thermal resistance across all surfaces.
Power Flattener
These pipes can constantly condense heat and maintain a consistent level while the evaporator shuffles variable heat fluxes.
Temperature Control
The evaporator and condenser temperature can be controlled through the effective usage of these pipes. A fixed temperature can be maintained which is ideal for heating water.
Geometry Control
The condenser and evaporator will use different areas to fit variable area spaces. High heat flux can be dissipated with low heat flux using natural convection.
Conclusion
These pipes provide us with endless thermal solutions. Their use in various industries has significantly improved industrial processes and saved unnecessary expenses.
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