Journal Article

FZJ-2022-04687

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Liquid film rupture beyond the thin-film equation: A multi-component lattice Boltzmann study

Pelusi, F. (Corresponding author)FZJ* ; Sega, M.FZJ* ; Harting, J.FZJ*

2022
American Institute of Physics [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/33803  doi:10.1063/5.0093043

Abstract: Under the condition of partial surface wettability, thin liquid films can be destabilized by small perturbations and rupture into droplets. Assuccessfully predicted by the thin film equation (TFE), the rupture dynamics are dictated by the liquid–solid interaction. The theorydescribes the latter using the disjoining pressure or, equivalently, the contact angle. The introduction of a secondary fluid can lead to a richerphenomenology, thanks to the presence of different fluid/surface interaction energies but has so far not been investigated. In this work, westudy the rupture of liquid films with different heights immersed in a secondary fluid using a multi-component lattice Boltzmann (LB)approach. We investigate a wide range of surface interaction energies, equilibrium contact angles, and film thicknesses. We found that therupture time can differ by about one order of magnitude for identical equilibrium contact angles but different surface free energies.Interestingly, the TFE describes the observed breakup dynamics qualitatively well, up to equilibrium contact angles as large as 130. A smallfilm thickness is a much stricter requirement for the validity of the TFE, and agreement with LB results is found only for ratios e ¼ h=L ofthe film height h and lateral system size L, such as e 103.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IEK-11)

Research Program(s):

1. 1215 - Simulations, Theory, Optics, and Analytics (STOA) (POF4-121) (POF4-121)
2. DFG project 431791331 - SFB 1452: Katalyse an flüssigen Grenzflächen (431791331)

Appears in the scientific report 2022

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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