Heat Pipe Thesis

Heat Pipe Thesis-79
For comparison, advanced heat pipes used for spatial applications have heat transfer capacity (measured in W∙m) order of value smaller.

For comparison, advanced heat pipes used for spatial applications have heat transfer capacity (measured in W∙m) order of value smaller.

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It is not even clear whether the oscillations are persistent or not and at which regimes.

For these reasons the PHP applications are very limited.

The other end (called condenser section) is connected to the cold point where the heat can be dissipated.

A portion of the tube between evaporator and condenser is called adiabatic section.

PHP is a capillary tube (with no wick structure) bent into many turns and partially filled with a working fluid.

Because the tube is thin, the liquid plugs and vapor bubbles are formed inside it.The heat is thus transferred not only by the latent heat transfer like in other types of heat pipes, but also by sweeping of the hot walls by the colder moving fluid and vice versa.This phenomenon is the reason of high efficiency of PHPs in comparison with other types of heat pipes.The heat is transferred mainly due to the latent heat absorption in the evaporator and its release in the condenser. They differ by their geometry and a mechanism of fluid transport inside the heat pipe.Since the latent heat is large, the heat pipes are quite efficient. Pulsating (or oscillating) heat pipe, invented in early 1990s present promising alternatives for the removal of high localized heat fluxes to provide a necessary level of temperature uniformity across the components that need to be cooled.This necessitates the development and use of more efficient, nontraditional cooling approaches.Special devices called heat pipes are used more and more widely to transfer the excessive heat to a colder environment.The PHP parameters are adjusted empirically, often without any certainty.To our knowledge, only a couple of small companies in the world produce them.In the open loop PHP, the ends may be open or closed.It is however generally recognized that the closed loop PHP is more efficient.

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