How does dew form?

Beysens, Daniel; Steyer, Alexandre; Guénoun, P.; Fritter, Daniela; Knobler, Charles M.

doi:10.1080/01411599108206932

Cited by 110 publications

(111 citation statements)

References 14 publications

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“…They grow and coalesce in a similar way as has been described by other authors [1]. On the contrary, a chemical structure on the substrate can induce a local ordering in the condensation patterns.…”

supporting

confidence: 77%

Subpattern formation during condensation processes on structured substrates

2003

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Abstract. -We investigate the temporal and spatial development of condensation patterns on chemically patterned substrates. We find that droplets condense preferentially on lyophilic sites and are surrounded by a depletion zone where no further nucleation occurs. The size of the depletion zones can be tuned by the flow rate of the incoming gas stream. If the size of the depletion zones is in a suitable range, well-defined droplets grow on the interstitial sites of the lyophilic lattice, i.e. on the non-structured areas. This can lead to ordered substructures.

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confidence: 77%

Subpattern formation during condensation processes on structured substrates

2003

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“…While this mode which is known as filmwise condensation 14 ( Figure 1a) is quite common, the formation of a liquid film is not desired due to the large resistance to heat transfer. Meanwhile, if a surface is coated with a low-energy non-wetting 'promoter' material (i.e., long chain fatty acid, wax, polymer coating, self-assembled monolayer) [15][16][17][18][19] , or if it naturally adsorbs hydrocarbons and impurities on its surface from the surroundings (as in the case of gold, silver, and chromium) [20][21][22] , the vapor forms discrete liquid droplets ranging in size from microns to millimeters [23][24][25] . This process is known as dropwise condensation 26 ( Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

Condensation heat transfer on superhydrophobic surfaces

2013

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(150 words max)Condensation is a phase change phenomenon often encountered in nature and industry for applications including power generation, thermal management, desalination, and environmental control. For the past eight decades, researchers have focused on creating surfaces allowing condensed droplets to be easily removed by gravity for enhanced heat transfer performance.Recent advancements in nanofabrication have enabled increased control of surface structuring for the development of superhydrophobic surfaces with even higher droplet mobility, and in some cases, coalescence-induced droplet jumping. Here, we provide a review of new insights gained to tailor superhydrophobic surfaces for enhanced condensation heat transfer considering the role of surface structure, nucleation density, droplet morphology, and droplet dynamics.Furthermore, we identify challenges and new opportunities to advance these surfaces for broad implementation into thermo-fluidic systems.

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“…Breath figures or dew forms over cold solid or liquid substrates on contact with humid air [1][2][3][4][5]. The growing water drops coalesce with each other, and several generations of drops coexist in a fractal pattern.…”

Section: Copyright C Epla 2010mentioning

confidence: 99%

“…The growing water drops coalesce with each other, and several generations of drops coexist in a fractal pattern. When the breath figures form over a pre-cooled liquid substrate (immiscible with water), they first self-organize into a locally ordered state, and then coalescence sets in, giving a pattern with polydisperse drop sizes [3][4][5]. Breath-figure-like patterns of water droplets appear on an evaporating polymer solution, exposed to a stream of moist air, and once the solvent evaporation is complete, the water drops evaporate away as well, leaving a highly ordered array of holes in the polymer film [6].…”

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confidence: 99%

“…In those experiments and models [2][3][4][5], the systems considered differ from polymer solutions in at least two important aspects: 1) the substrate is pre-cooled below the dew point and 2) coalescence is the dominant growth mechanism in the late stages. In polymer solutions, cooling is evaporation driven, the drops can remain non-coalescent and these grow and assemble into a close-packed, highly ordered array of similar size drops (packing fraction approaching 0.90).…”

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confidence: 99%

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Effect of solvent choice on breath-figure-templated assembly of “holey” polymer films

Sharma

Song

Jones

et al. 2010

EPL

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-Dew or breath figures is a disordered pattern formed by polydisperse water drops that form when a cold surface comes in contact with breath or moist air. Unexpectedly, self-assembled arrays of non-coalescent monodisperse water drops form when dilute solutions of polymers in volatile organic solvents are exposed to moist air. After solvent evaporation is complete, these condensation figures dry out as well, leaving "holey" polymer films, containing hexagonally ordered arrays of pores (0.2 to 10 µm). While the macroporous films are produced easily for a wide variety of solvents and polymers, there is no existing theory that describes how the pore size depends upon tunable parameters like humidity, air temperature and velocity as well as on the choice of solvent and polymer. In this study, we propose a transport model to elucidate the role of the solvent and airflow in determining the rate and extent of evaporative cooling, and contrast our model results with the corresponding experimental measurements for polystyrene/carbon disulfide solutions. We describe how modeling evaporative cooling is essential for the quantitative understanding of dominant processes that lead to growth, non-coalescence and self-assembly of water drops, and the subsequent formation of ordered arrays of pores. editor's choice Copyright c EPLA, 2010Breath figures or dew forms over cold solid or liquid substrates on contact with humid air [1][2][3][4][5]. The growing water drops coalesce with each other, and several generations of drops coexist in a fractal pattern. When the breath figures form over a pre-cooled liquid substrate (immiscible with water), they first self-organize into a locally ordered state, and then coalescence sets in, giving a pattern with polydisperse drop sizes [3][4][5]. Breath-figure-like patterns of water droplets appear on an evaporating polymer solution, exposed to a stream of moist air, and once the solvent evaporation is complete, the water drops evaporate away as well, leaving a highly ordered array of holes in the polymer film [6]. To name the process as breath-figure-templated assembly is to recognize growing amount of experimental evidence [6][7][8] showing that the formation of pores occurs as a result of nucleation, growth and self-assembly of non-coalescent water drops over evaporatively cooled polymer solution, as postulated (a) Current address:

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How does dew form?

Cited by 110 publications

References 14 publications

Subpattern formation during condensation processes on structured substrates

Subpattern formation during condensation processes on structured substrates

Condensation heat transfer on superhydrophobic surfaces

Effect of solvent choice on breath-figure-templated assembly of “holey” polymer films

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