Study on Heat Transfer Characteristics of Pulsating Heat Pipe
Purpose
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The heat generation density of smaller and higher-performance electronic components is rapidly increasing.
Conventional cooling systems have problems such as an increase in external power required for heat transport and an increase in the size of the system.
In the future, high performance and compact heat distribution technology will be needed to cope with higher output. The Pulsating Heat Pipe has a high heat transfer characteristic, does not require external power, and is not affected by installation position.
However, its heat transport characteristics and operating principle have not been elucidated.
In this study, focuses on the heat transfer characteristics of the pulsating heat pipe and investigates the effect of the working fluid behavior on the heat transfer.
Research content
In the test section, ethanol is used as the working fluid and a meandering channel in aluminum plate made by cutting work.
The channel is sealed by a polycarbonate plate to enable visualization.
The relationship between the heat transfer characteristics and the behavior of the working fluid is investigated by changing the amount rate (40-60%) and the installation posture.
An example of the behavior of the working fluid is shown below. In the channel, gas phase and liquid phase are separated by surface tension.
It was observed that the liquid phase was evaporated by heating and the liquid phase was pulsed, which propagated to the adjacent channel.
Heat transport is performed by sensible heat transport by liquid phase transfer and latent heat transport by vapor phase vaporization and condensation by this pulsating.
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