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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

Выпуски:
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Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v8.i2-3.170
10 pages

FLOW VISUALIZATION IN EVAPORATING LIQUID DROPS AND MEASUREMENT OF DYNAMIC CONTACT ANGLES AND SPREADING RATE

Nengli Zhang
Pearlica Technologies, Inc.
David F. Chao
Fluid Physics and Transport Branch, Ohio Aerospace Institute at NASA Glenn Research Center, Cleveland, OH 44135, USA

Краткое описание

A new hybrid optical system, consisting of reflection-refracted shadowgraphy and top-view photography, is used to visualize flow phenomena in a volatile-liquid drop on a nontransparent substrate and measure the spreading and instant dynamic contact angle of the drop simultaneously. Thermocapillary convection in the drop induced by evaporation and the real-time profile data of the drop are synchronously recorded by video recording systems. Experimental results obtained by using this unique technique clearly reveal that thermocapillary convection strongly affects the spreading process and characteristics of the dynamic contact angle of the drop. The comprehensive information of a sessile drop, including the local contact angle along the periphery of the drop, the instability of the three-phase contact line, and the deformation of the drop shape, can be obtained and analyzed.


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