Mechanism study on formation of initial condensate droplets

Liu, Tianqing; Mu, C.; Sun, Xueqing; Songbai, Xia

doi:10.1002/aic.11124

Cited by 21 publications

(6 citation statements)

References 13 publications

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“…In the expression developed for g SV (y VS w ) (eqn (12)), the values of the isotherm parameters, the surface tension of the solid in the absence of adsorption, and the temperature function of wetting is known. Therefore, eqn (12), is solved for z m , and the value of z m is found to be 213.…”

Section: Determination Of the Isotherm Parametersmentioning

confidence: 99%

“…We suggest that z c determines the critical size of the clusters. The clusters larger than the critical size clusters, which form nanoscale droplets, grow by condensation, 3,12 while smaller clusters evaporate from the Si surface.…”

Section: Calculating the Critical Size Of Liquid Toluene Dropletsmentioning

confidence: 99%

“…3,10,11 Despite the studies that have been performed on this subject, a physical understanding of the initiation of dropwise condensation is still not complete. 3,12 Recently, the zeta adsorption isotherm (ZAI) theory 13 was applied to investigate the role of molecular clustering under thermal disequilibrium conditions on the initiation of lmwise condensation for a system of heptane vapour adsorbing on a Si surface. 14 For the described system, it was experimentally found that the contact angle does not form on the Si surface, and the liquid heptane fully wets the solid surface.…”

Section: Introductionmentioning

confidence: 99%

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Initiation of condensation of toluene and octane vapours on a Si surface

Yaghoubian

2020

RSC Adv.

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Section: Determination Of the Isotherm Parametersmentioning

confidence: 99%

Section: Calculating the Critical Size Of Liquid Toluene Dropletsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Initiation of condensation of toluene and octane vapours on a Si surface

Yaghoubian

2020

RSC Adv.

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“…The presence and distribution of zein in the composite membranes were confirmed by locating nitrogen using a Shimadzu EPMA-1600 electron microprobe equipped with a Genesis EDS detector (EDAX, Japan). The sample surface is irradiated by a focused electron beam, resulting in X-ray emission characteristic of an element . The wavelength and intensity of the characteristic X-ray of nitrogen (green color) were analyzed to determine its content and distribution on the membrane surface.…”

Section: Experimental Sectionmentioning

confidence: 99%

Controlled Hydrophobic Biosurface of Bacterial Cellulose Nanofibers through Self-Assembly of Natural Zein Protein

Wan

Wang

et al. 2017

ACS Biomater. Sci. Eng.

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A novel, highly biocompatible bacterial cellulose (BC)-zein composite nanofiber with a controlled hydrophobic biosurface was successfully developed through a simple and green solution impregnation method, followed by evaporation-induced self-assembly (EISA) of adsorbed zein protein. The surface hydrophobicity of the zein-modified BC nanofibers could be controlled by simply changing the zein concentration, which is able to tune the morphology of self-assembled zein structures after EISA, thus affecting the surface roughness of composite membranes. Zein self-assembly at low concentrations (5 mg/mL) resulted in the formation of hierarchical zein structures (spheres and bicontinuous sponges) on the BC surface, thus increasing the surface roughness and leading to high hydrophobicity (the water contact angle reached 110.5°). However, at high zein concentrations, these large zein spheres assembled into a flat zein film, which decreased the surface roughness and hydrophobicity of membranes. The homogeneous incorporation of zein structures on the BC surface by hydrogen bonding did not significantly change the internal structure and mechanical performance of BC nanofibers. In comparison with pure BC, the BC-zein nanofibers had a better biocompatibility, showing a significantly increased adhesion and proliferation of fibroblast cells. This is probably due to the rough surface structure of BC-zein nanofibers as well as the high biocompatibility of natural zein protein. The novel BC-zein composite nanofibers with controlled surface roughness and hydrophobicity could be of particular interest for the design of BC-based biomaterials and biodevices that require specific surface properties and adhesion.

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“…The CHTC was reported three times that of the non-modified plain copper surface. Tianqing et al (2007) experimentally illustrated that onsurface condensation initiation was not dropwise and filmwise from the very beginning. Their results revealed that the formation mechanism of initial droplets for dropwise condensation has been based on the theory of nucleation sites.…”

Section: Introductionmentioning

confidence: 99%

Effects of Superhydrophobic, Hydrophobic and Hybrid Surfaces in Condensation Heat Transfer

2021

JAFM

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The effects of different hydrophobic and superhydrophobic coatings of PDMS, TGIC, SiO2 and a commercial coating called Danphobix on the condensation heat transfer characteristics of the plates were investigated and compared with the uncoated surface. The initial investigation showed that the values of heat flux and condensation heat transfer coefficient of the plate with Danphobix coating are higher than other coatings. Then, the plates with the commercial coating Danphobix were investigated at five different thicknesses to enhance the condensation heat transfer coefficient. Scanning Electron Microscopy analysis of surface with Danphobix coating showed that the hydrophilic-hydrophobic parts of the generated hybrid surface are formed irregularly in a new intertwined manner. According to the obtained results, decreasing the initial thickness of coating to a definite value, the condensation heat transfer coefficient was augmented. By further decrease, the condensation heat transfer coefficient was reduced due to the elimination of the physical structures of the coating against steam. The highest values of condensation heat transfer coefficient and heat flux of plates with Danphobix coating, that was obtained at the coating thickness of 17 µm comprised 65.2% of the surface coating by Danphobix. The results indicated that the heat flux and condensation heat transfer coefficient values of the plate with Danphobix coating thickness of 17µm was increased by 1.97-2.14 times and 1.96-2.46 times compared to the non-coated plate, respectively. In what follows, in addition to the critical thickness, the critical area of the coated surface is also obtained.

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Mechanism study on formation of initial condensate droplets

Cited by 21 publications

References 13 publications

Initiation of condensation of toluene and octane vapours on a Si surface

Initiation of condensation of toluene and octane vapours on a Si surface

Controlled Hydrophobic Biosurface of Bacterial Cellulose Nanofibers through Self-Assembly of Natural Zein Protein

Effects of Superhydrophobic, Hydrophobic and Hybrid Surfaces in Condensation Heat Transfer

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