Research output: Contribution to journal › Article › peer-review
Numerical contact line behavior prediction for droplet-wall impact by the modified Hoffman-function-based dynamic contact angle model. / Vozhakov, I. S.; Misyura, S. Y.; Shain, A. M. et al.
In: International Communications in Heat and Mass Transfer, Vol. 160, 108372, 01.2025.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Numerical contact line behavior prediction for droplet-wall impact by the modified Hoffman-function-based dynamic contact angle model
AU - Vozhakov, I. S.
AU - Misyura, S. Y.
AU - Shain, A. M.
AU - Mullyadzhanov, R. I.
AU - Piskunov, M. V.
AU - Strizhak, P. A.
PY - 2025/1
Y1 - 2025/1
N2 - The droplet-wall impact phenomenon is observed in numerous applications such as spray cooling, coatings, wetting, and inkjet printing. To date, there are still unresolved issues related to the effect of wettability and hysteresis on droplet spreading along a wall and rim fingering. This research deals with the effects of dynamic and static contact angles on droplet spreading evolution, as well as with droplet rim fingering characterization. Experiments and direct numerical simulations are performed in a wide range of Weber numbers (We = 1–375). At high We numbers, the droplet rim loses stability and begins to deform, forming fingers. The critical disturbances resulting in the formation of fingers occur in times of around 1 ms, which are significantly smaller than those typical of maximum droplet spreading. Moreover, a certain shape of the droplet meniscus is shown to be necessary for the growth of fingers. When the contact line receding takes place, the contact angle depends only on the initial contact line acceleration. Considering the contact angle hysteresis and its dependence on We ensures a better agreement with experimental data during the droplet advancing-to-receding transition and the receding phase.
AB - The droplet-wall impact phenomenon is observed in numerous applications such as spray cooling, coatings, wetting, and inkjet printing. To date, there are still unresolved issues related to the effect of wettability and hysteresis on droplet spreading along a wall and rim fingering. This research deals with the effects of dynamic and static contact angles on droplet spreading evolution, as well as with droplet rim fingering characterization. Experiments and direct numerical simulations are performed in a wide range of Weber numbers (We = 1–375). At high We numbers, the droplet rim loses stability and begins to deform, forming fingers. The critical disturbances resulting in the formation of fingers occur in times of around 1 ms, which are significantly smaller than those typical of maximum droplet spreading. Moreover, a certain shape of the droplet meniscus is shown to be necessary for the growth of fingers. When the contact line receding takes place, the contact angle depends only on the initial contact line acceleration. Considering the contact angle hysteresis and its dependence on We ensures a better agreement with experimental data during the droplet advancing-to-receding transition and the receding phase.
KW - Contact angle hysteresis
KW - Droplet contact angle
KW - Droplet contact line
KW - Droplet-wall impact
KW - Fingering
UR - https://www.mendeley.com/catalogue/27ec9efd-924b-33bc-aa2a-338838046b0c/
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85209590689&origin=inward&txGid=a5a9e4bbacd43f675ed4e518b8d9fc52
U2 - 10.1016/j.icheatmasstransfer.2024.108372
DO - 10.1016/j.icheatmasstransfer.2024.108372
M3 - Article
VL - 160
JO - International Communications in Heat and Mass Transfer
JF - International Communications in Heat and Mass Transfer
SN - 0735-1933
M1 - 108372
ER -
ID: 62769010