Wetting behaviour on a solid surface contaminated with a liquid layer

2014 ◽  
pp. 413-426
Keyword(s):  
Liquid Layer ◽  
Solid Surface

Microscopic Activation Phenomena in Heterogeneous Nucleation

2003 ◽  
Author(s):  
J. F. Lu ◽  
X. F. Peng
Keyword(s):  
Liquid Layer ◽  
Solid Surface ◽  
Heterogeneous Nucleation ◽  
Bubble Formation ◽  
Ultrathin Film ◽  
Wall Surface ◽  
Bulk Region ◽  
Heating Wall ◽  
Energy Peak ◽  
Energy Property

The energy property in liquid near the wall was theoretically investigated to understand the effects of wall surface on inception process of nucleation or embryo bubble formation in boiling systems. Analyses indicate that the liquid near heating wall has higher pressure than in bulk region owing to existence of strong attractive forces, and this pressure could maintain a stable liquid microlayer and cause a steady energy peak near the wall. So a vapor embryo is likely to occur beyond the stable microlayer instead of exactly at the solid surface. The stable liquid layer may also be the inception structure of the ultrathin film before nucleation occurs. Fluctuations enhance the phenomenon of energy peak until the nucleation occurs, while energy peak promotes nucleation. Employing the concept of energy peak, the inception phenomena of the microlayer and the formation of embryo bubbles near solid surface were described.

High Speed Liquid Impact Onto Wetted Solid Surfaces

1994 ◽  
Vol 116 (2) ◽  
pp. 345-348 ◽  
Author(s):  
H. H. Shi ◽  
J. E. Field ◽  
C. S. J. Pickles
Keyword(s):  
Shock Wave ◽  
Liquid Layer ◽  
Solid Surface ◽  
High Speed ◽  
Shear Failure ◽  
Soda Lime ◽  
Liquid Jet ◽  
Soda Lime Glass ◽  
The Impact

The mechanics of impact by a high-speed liquid jet onto a solid surface covered by a liquid layer is described. After the liquid jet contacts the liquid layer, a shock wave is generated, which moves toward the solid surface. The shock wave is followed by the liquid jet penetrating through the layer. The influence of the liquid layer on the side jetting and stress waves is studied. Damage sites on soda-lime glass, PMMA (polymethylmethacrylate) and aluminium show the role of shear failure and cracking and provide evidence for analyzing the impact pressure on the wetted solids and the spatial pressure distribution. The liquid layer reduces the high edge impact pressures, which occur on dry targets. On wetted targets, the pressure is distributed more uniformly. Despite the cushioning effect of liquid layers, in some cases, a liquid can enhance material damage during impact due to penetration and stressing of surface cracks.

Experimental and Numerical Investigation of Thin Liquid Layers at Curved Solid Edges

2013 ◽  
Vol 597 ◽  
pp. 51-62 ◽  
Author(s):  
Oliver Sommer ◽  
Daniel Moller ◽  
Günter Wozniak
Keyword(s):  
Layer Thickness ◽  
Liquid Layer ◽  
Solid Surface ◽  
Thickness Distribution ◽  
Basic Research ◽  
Solid Surfaces ◽  
Fundamental Interest ◽  
Disturbance Propagation ◽  
Liquid Layer Thickness ◽  
Or Applications

The knowledge of the behavior of thin liquid layers on solid surfaces is of fundamental interest as far as basic research or applications like technical coating or lubrication processes are concerned. The subject is currently getting more important, particularly due to the increasing requirements of thin liquid layer functionalities. We therefore studied the development of the liquid layer thickness distribution field as well as the liquid layer disturbance propagation on a plane solid surface in the vicinity of a curved solid surface experimentally and numerically using LIF (Laser-induced Fluorescence) and CFD (Computational Fluid Dynamics), respectively. The investigation focusses on the influence of the initial layer thickness and solid surface curvature as well as liquid properties like viscosity and surface tension on the film behavior, especially close to solid edges. Experimental and numerical results are shown pointing out relevant quantities for disturbance propagation and validation.

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