Material Brief: Characterization of Copper Sintered Powder Wicks - Porometer 3G

Samples of sintered copper wick were characterized for through pores using capillary flow porometry on the Porometer 3G series. The bubble point and mean pore size were measured based on ASTM methods. The data obtained was also utilized for permeability calculations.

Effective cooling is important for reliable functionality of electronic devices. Heat pipes have been identified as an option to effectively cool the electronic components. They consist of a sealed metal container that is capable of transferring heat through it to the working fluid. Heat pipes utilize phase changes in the working fluid inside in order to facilitate heat transport. Copper is used in most applications because of its good heat conductivity.

The most important component of the heat pipe is the wick structure. It is responsible for the return of the liquid from the condenser section to the evaporator section by capillary action, thus making it possible for the heat pipe to work in all orientations even against gravity. We have investigated sintered copper wicks using capillary flow porometry. The data generated was used to obtain both pore size distribution and permeability.

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