Library Subscription: Guest
Proceedings of the 27th National and 5th International ISHMT-ASTFE Heat and Mass Transfer Conference December 14-17, 2023, IIT Patna, Patna-801106, Bihar, India
December, 14-17, 2023, Bihar, India

Delayed Condensation on Nanoparticle Coated Transparent Lubricant-Infused Surfaces

Get access (open in a dialog) DOI: 10.1615/IHMTC-2023.860
pages 529-534


Vapor condensation on transparent glass surfaces is a common occurrence in many industrial and domestic applications, leading to reduced transparency and compromised functionality. Delaying condensation on such transparent surfaces not only reduces the heat loss and energy efficiency, but also preserves the inherent functionality of them. Here, we propose utilizing lubricantinfused, nanostructured coatings on transparent glass surfaces for condensation inhibition. We explore the role of such surface modifications on wettability, transparency, condensation dynamics, and heat transfer, in particular for varying nanoparticle density and surface structure length scales. For our studies, we use silicon dioxide (SiO2) nanoparticles to impart the necessary surface roughness, and infuse silicone oil (µ = 350 cSt) to make the surfaces transparent. Our findings reveal that the lubricant-infused surfaces effectively delay condensation initiation or nucleation, resulting in delayed or reduced loss of visibility through the glass surfaces. Moreover, once condensation initiated, the condensation rate on the coated surfaces is much lower than on bare glass surface. The condensation efficiency is found to be decreasing with increasing concentration of SiO2 nanoparticles on the surface. Conversely, the optical transparency of the coated surface is also found to be decreasing with increasing SiO2 concentration. Optimal performance in terms of both transparency and condensation inhibition was achieved on surfaces coated with a solution containing nanoparticle SiO2 concentration of 0.625 wt% (w/v). This work not only demonstrates an avenue to achieving transparent surfaces with delayed condensation, it develops the design principles for creating stable lubricant-infused surfaces for condensation applications.