Journal
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Volume 29, Issue 5, Pages 1422-1435Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2008.04.014
Keywords
Droplet impact; Kinetic wetting; Numerical simulation; High-speed visualization
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Funding
- US National Science Foundation [0622849]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0622849] Funding Source: National Science Foundation
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The objective of this work is to develop and validate a numerical model to study wetting during the impact of millimeter-size drops on a flat, smooth, solid substrate under isothermal or non-isothermal conditions. A finite-element modeling is used to simulate the transient fluid dynamics and heat transfer, considering Laplace forces on the liquid-gas boundary. The Lagrangian scheme allows a very precise tracking of the free surface deformation. In this work, the numerical model is extended to account for a temperature-dependent viscosity and for dynamic wetting at the contact line. Numerical results are presented to study the influence of the kinetic wetting parameter on the wetting incipience and behavior. Our results show the influence of wetting on the spreading and the transient drop shape. Also, numerical results are compared with high-speed visualization, for cases of isothermal and non-isothermal impact. Matching between simulations and high-speed visualization allows the determination of the value of the kinetic wetting parameter. Our main finding is that warm drops spread more than cold drops because of a reduction of viscous forces, and not because of an increase of wetting. (C) 2008 Elsevier Inc. All rights reserved.
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