Abstract
Pool boiling from a super-water-repellent (SWR) and polytetrafluoroethylene (PTFE) surface with checkered and spotted patterns has been studied experimentally. The heat transfer surfaces are copper with the SWR coating of checkered and spotted patterns and TiO2 -coated surface with PTFE spotted patterns. The domain of SWR and PTFE acts as nucleation sites and, therefore, bubble nucleation starts at very low superheating. In lower heat flux, bubbles with uniform size are generated on the SWR or PTFE domain of the heat transfer surface. These bubbles depart from the heat transfer surface when the contact line reaches the boundary of SWR or PTFE domain. Nucleate boiling with this surface was enhanced by seven times compared with the normal copper surface. The best was the spotted PTFE surface coated on TiO2 superhydrophilic surface.
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