Marangoni Stress and Its Effects on the Flow in an Evaporating Sessile Droplet

Abstract

By using the fluorescent nanoparticles as seed particles, the cconvective Marangoni (or Thermocapillary) flow in an cevaporating sessile water droplet has been observed. The cresults show that a stagnation point, where the surface flow cchanges its direction, exists at the boundary between the cmicro-region and the macro-region. Furthermore, the effects of cMarangoni stresses on the flow in the droplet have been cobserved and analyzed.