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DOI: 10.1016/j.colsurfa.2012.04.014 Stability of vertical films of molten glass due to evaporation
"... First, we report observations achieved on a gravitationally-driven film drainage with molten glass pointing out a stabilizing effect when temperature is larger than 1250 ◦ C. ..."
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First, we report observations achieved on a gravitationally-driven film drainage with molten glass pointing out a stabilizing effect when temperature is larger than 1250 ◦ C.
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, 2008
"... Under consideration for publication in J. Fluid Mech. 1 On the thickness of soap films: An ..."
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Under consideration for publication in J. Fluid Mech. 1 On the thickness of soap films: An
Modeling Thin Layer Flows with Strong Surface Tension Gradient Effect
"... Dramatic changes in flow behavior can be caused by nonuniformity in surface tension. We present results of a theoretical and numerical study of several flows where this nonuniformity is due to the presence of surfactant. Surfactants find general use in the coating and chemical process industries, fo ..."
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Dramatic changes in flow behavior can be caused by nonuniformity in surface tension. We present results of a theoretical and numerical study of several flows where this nonuniformity is due to the presence of surfactant. Surfactants find general use in the coating and chemical process industries, food and personal care products, pharmaceuticals, agrochemicals and elsewhere. Their presence at interfaces can cause large shearing, or Marangoni, stresses during flow, be-cause of developed gradients in concentration. We discuss both two and three dimensional unsteady flows. These are (i) leveling of a coating in the presence of an initially uniform distribution of surfactant, (ii) drainage of a vertical soap film, and (iii) flow behavior caused by a concentrated “bolus ” of surfactant. This last example illustrates the mechanism responsible for “crater ” formation in drying paint layers. 1. Anomalous behavior during leveling Surfactants are polar molecules that locate themselves preferentially on ma-terial interfaces and lower the surface tension there by their presence. Because of
ABSTRACT Soap Bubbles and Solid Spheres: Collisions and Interactions
, 2011
"... Under the right conditions, a moving sphere may successfully enter, and leave, a soap bubble without rupturing that bubble. The physics behind this phenomena are not well understood, nor the limiting factors (such as sphere size, speed, etc.). This work, investigating this phenomenon using high spee ..."
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Under the right conditions, a moving sphere may successfully enter, and leave, a soap bubble without rupturing that bubble. The physics behind this phenomena are not well understood, nor the limiting factors (such as sphere size, speed, etc.). This work, investigating this phenomenon using high speed photography, has produced several results which are presented. First, several distinct regimes, noted while photographing the interactions between the spheres and the bubbles, are classified and discussed. Next a probabilistic examination of the soap bubbles rupture by the moving spheres is presented. Then a conjecture for the limiting sphere sizes and speeds is presented. And finally some interesting phenomena, noted in the course of this investigation, are presented and discussed.
THEORY AND MODELING OF THIN FILM FLOWS S.B.G. O’Brien
"... Thin liquid films are ubiquitous in nature and technology so an understanding of their mechanics is important in many applications. A typical thin film flow consists of an expanse of liquid partially bounded by a solid substrate ..."
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Thin liquid films are ubiquitous in nature and technology so an understanding of their mechanics is important in many applications. A typical thin film flow consists of an expanse of liquid partially bounded by a solid substrate
A MATHEMATICAL MODEL FOR AN EXPANDING FOAM
, 2002
"... A theoretical and numerical model is presented for the shape evolution of the thin liquid films separating the gas bubbles in a foam. The motion is due to capillary action, surface tension gradients, and the overall expansion of the foam. The expansion is the result of the increase in gas content wi ..."
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A theoretical and numerical model is presented for the shape evolution of the thin liquid films separating the gas bubbles in a foam. The motion is due to capillary action, surface tension gradients, and the overall expansion of the foam. The expansion is the result of the increase in gas content with time. Process modeling is accomplished via the solution of three coupled partial differential equations. Two time scales are included in the model: a process time and a drying or curing time. It is demonstrated that the amount of surfactant is the dominant control mechanism for the final film thickness. If sufficient surfactant is present, the films will be shown to dilate uniformly in space. A number of known features of expanding foams are reproduced by the model. 1.
