arXiv subjects

Shubham Ganar

Publications and source records attributed to Shubham Ganar.

2 recordsLinked to original sources

arXiv2024

Experimental Insights into Droplet Behavior on Van der Waals and Non-Van der Waals Liquid-Impregnated Surfaces

Droplet impact is a fascinating phenomenon that occurs when a liquid droplet collides with a surface. It is not only a fundamental area of scientific inquiry but also has practical implications across many industries and natural systems. The dynamics during droplet impact on liquid-impregnated surfaces are of special interest because the properties of the surface and impregnated liquid may significantly change the impact outcome. We present a detailed study of the impact and subsequent retraction of liquid droplets on a liquid-impregnated surface using high-speed imagery. Square-shaped textures with varying post-spacings of 5, 20, and 30 um on a silicon wafer were fabricated and functionalised using octadecyl trichlorosilane. Two different lubricants, silicone oil and hexadecane, were infused to investigate how their properties affect impact dynamics. Droplet impacts were investigated on these surfaces across a broad range of Weber numbers (28-495). Additionally, we measured the stability of the LIS surface by calculating spreading coefficients and contact angles. The experiments revealed that the properties of the infused oil play an insignificant role in droplet dynamics, including spreading, rebound, and unique phenomena related to oil interaction with surface textures. This study provides insights into the intricate dynamics of droplet interactions with LIS, offering valuable contributions to understanding surface-wetting phenomena.

physics.flu-dyn↗

arXiv2023

Unraveling the Interplay of Leaf Structure and Wettability: A Comparative Study on Superhydrophobic Leaves of Cassia tora, Adiantum capillus-veneris, and Bauhinia variegata

In this article, superhydrophobic leaves of Cassia tora, Adiantum capillus-veneris (ACV), and Bauhinia Variegate are reported for the first time, and the wettability of these leaf's surfaces was correlated with their surface morphology at micro and nanoscale. Field Emission Scanning Electron Microscopy (FESEM) images of the surfaces were used to get surface morphological information at the micro-nanoscale structures. A special drying method was implemented to ensure the minimal structural collapse of these surfaces under the high vacuum of FESEM. FESEM images of Cassia tora leaves showed widely spaced, low aspect ratio nano petals distributed on bumpy blunt micro features, responsible for high contact angle hysteresis and high roll angle measured on the Cassia tora leaves. ACV leaves showed the presence of micron-scale spherical morphology made of nanoscale hair-like features. These hierarchical re-entrant surface features generated a very high contact angle and low roll-off angle. Leaves of Bauhinia variegate showed similar superhydrophobic and self-cleaning properties. However, surface features were different, which consisted of a higher aspect ratio and closely spaced nano petals uniformly distributed over flat surfaces consisting of micro-scale ridges. Droplet impact studies on these surfaces at different Weber numbers showed different behaviour due to these different micro-nano features.

physics.flu-dyn↗