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

Nengli Zhang | Zendy; David F. Chao | Zendy

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

Author(s) -

Nengli Zhang,

David F. Chao

Publication year - 2001

Publication title -

journal of flow visualization and image processing

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.214

H-Index - 12

eISSN - 1940-4336

pISSN - 1065-3090

DOI - 10.1615/jflowvisimageproc.v8.i2-3.170

Subject(s) - shadowgraphy , drop (telecommunication) , materials science , contact angle , mechanics , optics , drop impact , liquid drop , sessile drop technique , convection , flow visualization , flow (mathematics) , wetting , composite material , physics , mechanical engineering , engineering , laser

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

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