from Part I - Collision of Liquid Jets and Drops with a Dry Solid Wall
Published online by Cambridge University Press: 13 July 2017
Drop spreading after an impact onto a dry rigid wall is covered in Sections 4.1 to 4.4 taking into account the inertial and viscous effects, and liquid compressibility as well as geometric and thermal effects, for example associated with phase transition. In addition, the rim dynamics is considered in Section 4.5. The effect of the target curvature on drop spreading as well as surface encapsulation are dealt with in Section 4.6. Different scenarios accompanying drop impacts onto rigid walls are described in Section 4.7. The effect of the reduced gas pressure on drop impact is outlined in Section 4.8. Nonisothermal drop impacts are discussed in Section 4.9. This is extended to solidification and icing accompanying drop impact in Section 4.10.
Drop impact onto a dry wall is an important element of various industrial processes; among them are spray cooling, cleaning, coating, wetting and ink-jet printing. Also, naturally occurring impacts can be of interest, for instance raindrop impacts are studied due to their relevance to soil detachment and erosion (Abuku et al. 2009, Imeson et al. 1981) and plant disease spreading. In Guigon et al. (2008) first steps have been made towards harvesting of the energy of raindrop impacts by transforming it to electricity using a piezoelectric system. Other examples include the impact of high-speed drops leading to the erosion of turbine blades (Li et al. 2008, Zhou et al. 2008) or to the deformation and fraction of rocks (Momber 2004). On the latter, also see Section 1.1 in Chapter 1.
The phenomena associated with drop impacts have fascinated many researchers over the years. Recent advances in the theoretical modeling, the appearance of user-friendly, high-speed visualization systems and improvement of numerical methods for simulations of interfacial flows allow the elucidation of the drop impact and spreading on the wall in great detail. Drop impact is also a convenient model process to systematically investigate other physical phenomena, such as the nature of the dynamic contact angle: e.g., in Bayer and Megaridis (2006) contact line dynamics was studied and results explained in terms of hydrodynamic wetting theory and the molecular-kinetic theory of wetting.
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