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In this study, we investigate the stability of a liquid film that partiallywets a corner between a cylinder and a substrate, using a combination oftheoretical and numerical approaches. The film stability, which depends on thefilm size and the wall wettability, is firstly predicted by a standard linearstability analysis (LSA) within the long-wave theoretical framework. We findthat the film size plays the most important role in controlling the filmstability. Specifically, the thinner the film is, the more sensitive it becomesto the large-wavenumber perturbation. The wall wettability mainly impacts thegrowth rates of perturbations and slightly influences the marginal stabilityand post-instability patterns of wrapping films. We compare the LSA predictionswith numerical results obtained from a disjoining pressure model (DPM) andVolume-of-Fluid (VOF) simulations, which provide more insights into the filmbreakup process. At the early stage there is a strong agreement between the LSApredictions and the DPM results. Notably, as the perturbation grows, thin filmregions connecting two neighboring satellite droplets form which may eventuallylead to a stable or temporary secondary droplet, an aspect which the LSA isincapable of capturing. In addition, the VOF simulations suggest that beyond acritical film size the crest coalescence mechanism becomes involved during thebreakup stage. Therefore, the LSA predictions are able to provide only an upperlimit on the final number of satellite droplets.

Dewetting of a corner film wrapping a wall-mounted cylinder