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Analysis of heat pipe cooling technology - Cooltron
2017-02-10 10:24:53 adminHeat Pipe
Heat Pipe is a heat-transfer device that applies both principles of Thermal Conductivity and Phase Change Cycle to efficiently dissipate the heat between Heat Source and Heat Sink.
Heat Pipe is made of special metal materials characteristic of isothermal feature, which makes the
Heat Pipe outstanding thermal performance in heat conductivity. In addition, Heat Pipe’s hollow metal
envelope (usually tube shell) has light-weight property. These two main features contribute to Heat
Pipe’s popularity in today’s thermal applications.
Heat Pipe Structure1. Heat Pipe Envelope (Materials: Copper, Aluminum, Stainless Steel, and etc.,)
2. Working Fluid (Media: Pure Water, Refrigerant, Alkali Metal, and etc.,)
3. Wick Structure for Capillary Action
Working Principles of Heat Pipe
Thermal Conductivity: At the hot interface of a heat pipe a working liquid in contact with a thermally
conductive solid surface, where the Heat Source is (e.g. CPU, or LED Engine) turns into a vapor by
absorbing heat from that Heat Source.
Phase Change Cycle: The vapor travels along the heat pipe to the cold interface will release the
latent heat, and then condense back into a working liquid (e.g. Pure Water). The liquid then returns
to the hot interface through capillary action, centrifugal force, and or gravity. And such a cycle of
phase change between liquid and vapor will repeat over and over again. Due to the very high heat
transfer coefficients by vaporization and condensation, heat pipes are very highly effective thermal
conductors for heat dissipation.
Types of Heat Pipe
Heat Pipe Feature
Excellent Heat Conductivity
Highly Efficient Heat Transfer for Phase Change Cycle
Good Isothermal Property