Abstract

Boiling heat transfer is one of the most effective methods to meet the challenge of heat dissipation of high heat flux devices. A wetting hybrid surface has been shown to have better performance than the hydrophilic or hydrophobic surface. This kind of wetting hybrid modification is always carried out on a plain or flat surface. In this paper, Polytetrafluoroethylene (PTFE) powders were coated on a superhydrophilic micro copper dendrite fin surface to build a wetting hybrid surface. The pool boiling experimental results showed that after applying the coating, the wall superheat dramatically decreased to 8 K, which is 9 K lower than that on the original surface at 250 W·cm-2, and has a better performance than a Silicon pin fin based wetting hybrid surface.

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