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231224s2017 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.7b00957
|2 doi
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|a pubmed24n0906.xml
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|a (NLM)28510453
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|a DE-627
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|e rakwb
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|a eng
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|a Askounis, Alexandros
|e verfasserin
|4 aut
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|a Influence of Local Heating on Marangoni Flows and Evaporation Kinetics of Pure Water Drops
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|c 2017
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 13.07.2018
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|a Date Revised 13.07.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The effect of localized heating on the evaporation of pure sessile water drops was probed experimentally by a combination of infrared thermography and optical imaging. In particular, we studied the effect of three different heating powers and two different locations, directly below the center and edge of the drop. In all cases, four distinct stages were identified according to the emerging thermal patterns. In particular, depending on heating location, recirculating vortices emerge that either remain pinned or move azimuthally within the drop. Eventually, these vortices oscillate in different modes depending on heating location. Infrared data allowed extraction of temperature distribution on each drop surface. In turn, the flow velocity in each case was calculated and was found to be higher for edge heating, due to the one-directional nature of the heating. Additionally, calculation of the dimensionless Marangoni and Rayleigh numbers yielded the prevalence of Marangoni convection. Heating the water drops also affected the evaporation kinetics by promoting the "stick-slip" regime. Moreover, both the total number of depinning events and the pinning strength were found to be highly dependent on heating location. Lastly, we report a higher than predicted relationship between evaporation rate and heating temperature, due to the added influence of the recirculating flows on temperature distribution and hence evaporation flux
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Kita, Yutaku
|e verfasserin
|4 aut
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|a Kohno, Masamichi
|e verfasserin
|4 aut
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| 700 |
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|a Takata, Yasuyuki
|e verfasserin
|4 aut
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|a Koutsos, Vasileios
|e verfasserin
|4 aut
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|a Sefiane, Khellil
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 33(2017), 23 vom: 13. Juni, Seite 5666-5674
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:33
|g year:2017
|g number:23
|g day:13
|g month:06
|g pages:5666-5674
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|u http://dx.doi.org/10.1021/acs.langmuir.7b00957
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