Condensation on micro-nano textured surfaces:
Condensation is a natural phenomenon that occurs when the substrate temperature goes below the dew point temperature. It has already been established that the dropwise condensation (DWC) is more efficient than the filmwise mode of condensation (FWC) for pure vapor. This is due to the higher heat transfer coefficient observed during DWC. Dropwise condensation of water vapor on solid surfaces is an enduring research topic due to the widespread applications. Dropwise condensation on surfaces has been investigated through experiments, numerical as well as theoretical modeling. Researchers are still searching for the durable dropwise condensing surfaces, as most of the surfaces either not durable or not scalable to the industrial scale. Besides the search for the durable dropwise condensing surfaces, researchers are interested in further improvement of the heat transfer coefficient during condensation. Micro-nano textured surfaces, lubricant impregnated surfaces, physically and chemically patterned surfaces have been used to demonstrate the further improvement of DWC heat transfer coefficient. The main bottleneck of dropwise condensation is the faster droplet removal. In our group, we work on the fast and effective technique of droplet removal from a surface for sustained dropwise condensation in the presence of non-condensable gases.
For details see:
- Mahapatra et al., Key design and operating parameters for enhancing dropwise condensation through wettability patterning, International Journal of Heat and Mass Transfer, (2016), 92, 877–883