<p>The wettability always plays a key role in the thermal transport at solid-liquid interface at different scales, however, its enhancement mechanism has not been clearly understood till now. In this work, the nucleate boiling behaviors of argon fluid on different heterogeneous wetting surfaces were examined with the non-equilibrium molecular dynamics method, in which the ring-patterned and stripe-patterned schemes were designed and discussed, respectively. By measuring the boiling inception time and evaporation rate of liquid argon atoms, it is found that the ring-patterned surface shows an advantage in the nucleate boiling heat transfer compared with the stripe-patterned one. The differences in heat transfer characteristics for different surfaces can be explained through the qualitative analysis of fluid density distribution and solid-fluid interaction energy. Furthermore, the boiling phenomena on ring-patterned surfaces with alternated hydrophilic and hydrophobic intervals were simulated to study the effect of area fraction of hydrophobic region on the heat transfer performance. It is observed that bubble nucleus firstly appear over the hydrophobic region of the substrate. The substrate with more hydrophilic area will have a better heat transfer performance. It is also demonstrated that there is an optimal area fraction, which makes the evaporation rate of fluid reach the highest value. The obtained results in this work can guide the design and fabrication of nanocoating surface to enhance its heat transfer performance under high heat flux density condition.</p>

Study of Boiling Heat Transfer on Heterogeneous Wetting Surface With Md Simulation

Paper Proceedings: https://asmedigitalcollection.asme.org/HT/HT2021/volume/84874

ASME 2021 Heat Transfer Summer Conference (SHTC2021)

Supporting the need among researchers worldwide for additional online and multimedia content, ASME now offers the ASME Conference Video Collection. This platform will collect and provide long-term access to conference presentation videos, encompassing all technology areas within ASME's technical conference and events program. About 30,000-40,000 engineers across all mechanical engineering and related disciplines participate in ASME conferences each year. This includes authors of approximately 6,000 to 8,000 technical papers published by ASME, the majority of whom also submit video presentations for our virtual conferences. The video collection will be available as an add-on to existing product packages or as a separate subscription.