2017/08/31 by Aneet Dharmavaram Narendranath, Narendranath, Aneet Dharmavaram
Engineering · Materials Science · #76S99 #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Heat Transfer #Fluid Dynamics and Thin Films #Solidification and crystal growth phenomena
paper · pdf · doi:10.48550/arxiv.1709.00124
openalex publication_date 2017/08/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Thin liquid films on isothermal substrates, where film is flat and parallel\nto the substrate, succumb to thermocapillary instabilities and rupture forming\nlocal hot-spots. These instabilities are called long wavelength instabilities\nand are specific to aspect ratios where the liquid film mean thickness is\nseveral orders of magnitude less than the substrate characteristic dimension.\nIn the absence of stabilizing gravitational acceleration, the growth rate of\nthermocapillary instabilities is further intensified, driving the film to\nrupture at an even earlier time. Numerical simulations of zero gravity dynamics\nof Newtonian liquid films on a solid, horizontal, isothermal substrate are\nconducted. When the solid, isothermal substrate is replaced with one that\npossesses one- dimensional porosity, is fully saturated with the same fluid as\nthat of the liquid film and is deep enough to accommodate all of the liquid on\nit, it is observed that destabilizing spatial modes are damped thereby\npreventing rupture and the film lifespan is prolonged. This nonlinear evolution\nis visualized and quantified using recurrence plots.\n