Growth of Breath Figures

Beysens, Daniel; Knobler, Charles M.

doi:10.1103/physrevlett.57.1433

Cited by 297 publications

(278 citation statements)

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“…The dynamics of condensation of water vapor from air into liquid droplets on a surface has been extensively characterized [11]- [17]. Three stages of droplet growth may be identified [12], [14]- [16]: (i)…”

Section: Introductionmentioning

confidence: 99%

The effect of relative humidity on dropwise condensation dynamics

Castillo

Weibel

Garimella

2015

International Journal of Heat and Mass Transfer

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Dropwise condensation of atmospheric water vapor is important in multiple practical engineering applications. The roles of environmental factors and surface morphology/chemistry on the condensation dynamics need to be better understood to enable efficient water-harvesting, dehumidication, and other psychrometric processes. Systems and surfaces that may promote faster condensation rates and selfshedding of condensate droplets could lead to improved mass transfer rates and higher water yields in harvesting applications. In the present study, experiments are performed in a facility that allows visualization of the condensation process on a vertically oriented, hydrophobic surface at a controlled relative humidity and surface subcooling temperature. The distribution and growth of water droplets are monitored across the surface at different relative humidities (45%, 50%, 55%, and 70%) at a constant surface subcooling temperature of 15 °C below the ambient temperature. The droplet growth dynamics exhibits a strong dependency on relative humidity in the early stages during which there is a large population of small droplets on the surface and single droplet growth dominates over coalescence effects.At later stages, the dynamics of droplet growth is insensitive to relative humidity due to the dominance of coalescence effects. The overall volumetric rate of condensation on the surface is also assessed as a function of time and ambient relative humidity. Low relative humidity conditions not only slow the absolute rate of condensation, but also prolong an initial transient regime over which the condensation rate remains significantly below the steady-state value.Keywords: dropwise condensation, relative humidity, growth dynamics, droplet distribution,

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Section: Introductionmentioning

confidence: 99%

The effect of relative humidity on dropwise condensation dynamics

Castillo

Weibel

Garimella

2015

International Journal of Heat and Mass Transfer

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“…Another example is the formation of dew [21]. Knobler and Beysens investigated the formation of breath figures under water droplets condensation [22][23][24][25] and found that they did not only form on solid surfaces but on liquids as well, specifically on paraffin oil [24]. Main features of the process breath figures selfassembly have been revealed under detailed study of water condensation in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Main features of the process breath figures selfassembly have been revealed under detailed study of water condensation in Refs. [22][23][24][25], including the intriguing effect of non-coalescence of sessile droplets, to be discussed later. The interest to the breathfigures self-assembly was revived, when Widawski, Francois, Pitois et al demonstrated in the series of the papers [26][27][28][29][30], that the breath-figures self-assembly allow formation of micro-porous reliefs with wellcontrolled topography when polymer solutions are rapidly evaporated in a humid atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…The treatment by octadecyltrichlorosilane enabled to control of the apparent contact angle of the cooled solid substrate [22]. t , but as a result of coa1escences the average droplet radius grows as 75 .…”

mentioning

confidence: 99%

“…Beysens et al studied the formation of breath figures patterns formed on cold borosilicate substrates, either pristine or hydrophobized by the solution of octadecyltrichlorosilane [22]. The treatment by octadecyltrichlorosilane enabled to control of the apparent contact angle of the cooled solid substrate [22].…”

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confidence: 99%

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Breath-Figures Self-Assembly, the Versatile Method of Manufacturing Membranes and Porous Structures: Physical, Chemical and Technological Aspects

Bormashenko¹

2017

Preprint

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Abstract:The review is devoted to the physical, chemical and technological aspects of the breath-figures self-assembly process. Main stages of the process and the impact of the polymer architecture and physical parameters of the breath-figures self-assembly on the eventual pattern are covered. The review is focused on the hierarchy of spatial and temporal scales inherent for the breath-figures self-assembly. Multi-scale patterns arising from the process are addressed. The characteristic spatial lateral scales of patterns vary from nanometers to dozens of micrometers. The temporal scales of the process span from micro-seconds to seconds. The qualitative analysis performed in the paper demonstrates that the process is mainly governed by the interfacial phenomena, whereas the impact of inertia and gravity is negligible. Characterization and applications of polymer films manufactured with breath-figures self-assembly are discussed.

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