PPT Slide

Heat Transfer Processes in Capillary Porous Structures

Limiting effects to the heat transfer in the porous media

• Wicking limit:

“Capillary action as the driving force to transport the working fluid in the wick is limited by pressure drop and wicking height.”

• Boiling limit:

“Increased radial heat flux leads to nucleate boiling in the mesh wick. Vapour in the wick forms an insulating layer and leads to a Dryout”.

Connection of both limiting effects:

Vapour bubbles in the wick affect the wicking performance of the porous structure.

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