Temperature distribution in a liquid layer on a horizontal solid surface

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.

Download Full-text

A numerical study of thermocapillary migration of a small liquid droplet on a horizontal solid surface

Physics of Fluids ◽

10.1063/1.3432848 ◽

2010 ◽

Vol 22 (6) ◽

pp. 062102 ◽

Cited By ~ 35

Author(s):

Huy-Bich Nguyen ◽

Jyh-Chen Chen

Keyword(s):

Solid Surface ◽

Numerical Study ◽

Liquid Droplet ◽

Thermocapillary Migration ◽

Horizontal Solid Surface

Download Full-text

High Speed Liquid Impact Onto Wetted Solid Surfaces

Journal of Fluids Engineering ◽

10.1115/1.2910278 ◽

1994 ◽

Vol 116 (2) ◽

pp. 345-348 ◽

Cited By ~ 11

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.

Download Full-text