Investigation of the Enhancement of Boiling Heat Transfer Performance Utilizing a Hybrid Wetting Surface with a Macroscopic Millimeter-Scale Pillar Array

The heat transfer process is an important part of energy utilization and conversion, boiling one the most significant effective modes in use. Enhancing can directly improve use efficiency promote sustainable development industry. Surfaces with mixed wetting topologies have been proven to possess potential enhance transfer. However, promoting mechanism these types surfaces requires further clarification on actual exchanger macroscale enhancement structures, such as millimeter-scale pillars. In this study, performance hybrid array macropillars were explored using both experimentation numerical simulation. experiment, single bubble growth dynamics at onset sites nucleation initial stage recorded a CCD camera top view. coefficient was also measured stable stage. Within entire tested range flux (3.75–18 W/cm2), significantly enhanced transfer, HPo(bottom)–HPi(top) surface (surf-2) exhibited best performance. At representative 12.5 W/cm2, HPo (bottom)–HPi (top) HPi (bottom)–HPo (surf-3) more than 33% 18% higher pure copper flat surface, 16% 3% uniform (surf-4), respectively. On hand, due view field being blocked by fiercely growing bubbles stage, it difficult record numbers gather statistics order correlate enhancement. other during lacked information about vertical cross-sectional plane. Therefore, two-dimensional VOF-based simulation adopted supplement contribution results indicated that inhibit overgrowth accelerate departure compared spatially hydrophobic surface. radius time surf-2 smaller those surf-3. These are believed be reasons why experiment. Both experiment analysis proved pillars thus demonstrating applications horizontal or tube exchangers.