Condensation of steam on the surface of hard coated copper discs

Koch, Gerd; Zhang, D. C.; Leipertz, Alfred

doi:10.1007/s002310050105

Cited by 41 publications

(17 citation statements)

References 17 publications

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“…For large subcoolings, the heat transfer coefficients for DWC approach the values for FWC. These results are in agreement with the investigations made for hard coated surfaces [14,15], but disagree with those obtained previously for ionimplanted surfaces using ion-beams for the implantation [16]. Increasing the ion dose increases the heat transfer coefficient.…”

Section: Effect Of the Ion Dosesupporting

confidence: 78%

“…evaporator feed water pump, (7) water tank, (8) electric heater, (9) steam feed to the condenser, (10) condensate from the condenser tube, (11) condensate from the condenser shell, (12) venting, (13) condensate cooler, (14) condensate collection tank, (15) condensate pump, (16) level controller, (17) cooling water into the condenser, (18) cooling water out of the condenser, (19) cooling water into the plate heat exchanger, (20) cooling water out of the plate heat exchanger, (Ti) resistance thermometer Pt100-X, (Fi) flow meter, (mi) mass flow measurement.…”

Section: Methodsmentioning

confidence: 99%

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Experimental study of dropwise condensation on plasma-ion implanted stainless steel tubes

Kananeh

Rausch

Fröba

et al. 2006

International Journal of Heat and Mass Transfer

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Section: Effect Of the Ion Dosesupporting

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Experimental study of dropwise condensation on plasma-ion implanted stainless steel tubes

Kananeh

Rausch

Fröba

et al. 2006

International Journal of Heat and Mass Transfer

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“…8 Dropwise condensation is therefore well known to be highly dependent on surface orientation, where a vertical condenser minimizes the departure size and maximizes heat transfer and vice versa for horizontally oriented condensers. 9,10 As an alternative to removing large droplets by gravity, condensing micro-droplets can spontaneously jump out of plane from nanostructured superhydrophobic surfaces upon coalescence. 11 This passive jumping mechanism serves to decrease the maximum droplet departure size of the condensate by several orders of magnitude compared to gravitationally driven dropwise condensation.…”

Section: Introductionmentioning

confidence: 99%

How Surface Orientation Affects Jumping-Droplet Condensation

Mukherjee

Berrier

Murphy

et al. 2019

Joule

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Because of its smaller condensate departure size, jumping-droplet condensation on superhydrophobic surfaces provides better heat transfer performance than does regular dropwise condensation. As the jumping mechanism is gravity independent, the effects of surface orientation on jumping-droplet condensation were previously ignored. Here, with the help of long-term condensation experiments on different surface orientations, it is shown that jumping-droplet condensers are dramatically enhanced when gravitational shedding complements the jumping. The analysis presented here can be useful in designing more efficient condensers.

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“…The basic heat exchanger [4,41] is a horizontal copper cylinder encased inside a Teflon jacket as convectively cooled with cold water as shown in figure 3A. By controlling the steam and the water flow rates, the degree of the sub-cooling of the steam was varied.…”

Section: Design Of the Heat Exchanger Incorporating Patterned Siliconmentioning

confidence: 99%

“…The patterned silicon wafer, on copper cylinder, comes in contact with the steam, whereas the other flat end of the cylinder is convectively cooled by water. This design ensures[4,41] unidirectional flux of heat along the axis of the cylinder.…”

mentioning

confidence: 99%

Coalescence of drops near a hydrophilic boundary leads to long range directed motion

Chaudhury

Chakrabarti

Tibrewal

2014

Extreme Mechanics Letters

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Abstract.A new mechanism for the passive removal of drop on a horizontal surface is described that does not require pre-fabrication of a surface energy gradient. The method relies upon the preparation of alternate hydrophilic/hydrophobic stripes on a surface. When one side of this surface is exposed to steam, with its other surface convectively cooled with cold water, steam condenses as a continuous film on the hydrophilic stripes but as droplets on the hydrophobic stripes.Coalescence leads to a random motion of the center of mass of the fused drops on the surface, which are readily removed as they reach near the boundary of the hydrophobic and hydrophilic zones thus resulting in a net diffusive flux of the coalesced drops from the hydrophobic to the hydrophilic stripes of the surface. Although an in-situ produced thermal gradient due to differential heat transfer coefficients of the hydrophilic and hydrophobic stripes could provide additional driving force for such a motion, it is, however, not a necessary condition for motion to occur. This method of creating directed motion of drops does not require a pre-existing wettability gradient and may have useful applications in thermal management devices.

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Condensation of steam on the surface of hard coated copper discs

Cited by 41 publications

References 17 publications

Experimental study of dropwise condensation on plasma-ion implanted stainless steel tubes

Experimental study of dropwise condensation on plasma-ion implanted stainless steel tubes

How Surface Orientation Affects Jumping-Droplet Condensation

Coalescence of drops near a hydrophilic boundary leads to long range directed motion

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