XIA Xue-lian, ZHENG Xu, HUANG Xian-fu, ZHOU Jin-zhi, YU Ying-song. Experimental Investigation of Evaporating Sessile Droplets on PDMS Surface[J]. Applied Mathematics and Mechanics, 2017, 38(5): 495-502. doi: 10.21656/1000-0887.370358
Citation: XIA Xue-lian, ZHENG Xu, HUANG Xian-fu, ZHOU Jin-zhi, YU Ying-song. Experimental Investigation of Evaporating Sessile Droplets on PDMS Surface[J]. Applied Mathematics and Mechanics, 2017, 38(5): 495-502. doi: 10.21656/1000-0887.370358

Experimental Investigation of Evaporating Sessile Droplets on PDMS Surface

doi: 10.21656/1000-0887.370358
Funds:  The National Natural Science Foundation of China(General Program)(11572114)
  • Received Date: 2016-11-17
  • Rev Recd Date: 2017-03-06
  • Publish Date: 2017-05-15
  • Evaporation of sessile water droplets on polydimethylsiloxane (PDMS) surface was experimentally studied with the particle tracking velocimetry (PTV) technique. The fluorescent microspheres at the solid-liquid interface first moved towards the center and then back to the contact line. Because the evaporative flux near the contact line is less than that far from the line, there will be a capillary flow towards the center when the contact line is pinned. Such a flow will carry microspheres towards the center. Moving characteristics of the contact line were also investigated. It is found that the theoretical values of the moving velocity at different moments in the CCA stage is of the same order with the experimental values. However, the experimental moving accelerations were much larger than the theoretical ones because the microspheres at the contact line weaken the interaction between the PDMS surface and the contact line.
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