Boiling Heat Transfer On Biphilic Surfaces With Arrays Of Grooves

Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences, 630090, Russia, 1 Lavrentyev Ave, Novosibirsk

^* Corresponding author: victor.lipps@gmail.com

Abstract

Experiments were carried out on biphilic surfaces made using technology consisted in the deposition (105℃) of fluorinated methoxysilane on a copper surface with arrays of grooves preliminarily created by laser ablation, as a result of which deposition the grooves became superhydrophobic. Grooves were two types: parallel grooves and groove lattice. Size of grooves was 30-43 um, pitch for parallel grooves was 1-1,5 mm and for grove lattice – 1 mm. The experiments were carried out on distilled water at atmospheric pressure. For all surfaces, a significant intensification of heat transfer has been achieved, compared with a smooth copper surface. It was shown, that boiling heat transfer depend only from pitch between grooves for both types of grooves. Dependence of heat transfer coefficient from size of grooves was not observed. Most efficient type of surfaces was groove lattice with smallest pitch.