TY - JOUR
T1 - Flow Patterns Induced by the Thermocapillary Effect and Resultant Structures of Suspended Particles in a Hanging Droplet
AU - Takakusagi, Tomohiko
AU - Ueno, Ichiro
N1 - Funding Information:
We acknowledge Prof. Koichi Nishino and Dr. Taishi Yano (Yokohama National University) and Prof. Masahiro Motosuke (Tokyo University of Science) for invaluable support in carrying out a series of experiments with three-dimensional particle tracking velocimetry. We also acknowledge Prof. Hendrik C. Kuhlmann (TU Wien) for a fruitful discussion. Mr. Takumi Watanabe at Tokyo University of Science is acknowledged for support in carrying out the experiments. This study was financially supported by a Grant-in-Aid for Scientific Research (B) (24360078) and by a Grant-in-Aid for Challenging Exploratory Research (16K14176) from the Japan Society for the Promotion of Science (JSPS). One of the authors, I.U., acknowledges support by Tokyo University of Science through the Fund for Strategic Research Areas.
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/11/21
Y1 - 2017/11/21
N2 - We focus on the flow patterns and resultant structures of suspended solid particles in a hanging droplet caused by the thermocapillary effect. A droplet is hung on a heated cylindrical rod facing downward, and another cooled rod is placed just beneath the droplet to create the temperature difference between both ends of the droplet. As the temperature difference increases, the induced flow exhibits transitions from an axisymmetric time-independent steady state to three-dimensional time-dependent oscillatory states. These flow states are judged through detecting spatiotemporal correlations between the behaviors of the particles and the variation of the temperature over the droplet surface. We find that the particle accumulation structures are realized in this geometry and that their structures vary as a function of the intensity of the thermocapillary effect.
AB - We focus on the flow patterns and resultant structures of suspended solid particles in a hanging droplet caused by the thermocapillary effect. A droplet is hung on a heated cylindrical rod facing downward, and another cooled rod is placed just beneath the droplet to create the temperature difference between both ends of the droplet. As the temperature difference increases, the induced flow exhibits transitions from an axisymmetric time-independent steady state to three-dimensional time-dependent oscillatory states. These flow states are judged through detecting spatiotemporal correlations between the behaviors of the particles and the variation of the temperature over the droplet surface. We find that the particle accumulation structures are realized in this geometry and that their structures vary as a function of the intensity of the thermocapillary effect.
UR - http://www.scopus.com/inward/record.url?scp=85034851036&partnerID=8YFLogxK
U2 - 10.1021/acs.langmuir.7b02789
DO - 10.1021/acs.langmuir.7b02789
M3 - Article
C2 - 29083912
AN - SCOPUS:85034851036
SN - 0743-7463
VL - 33
SP - 13197
EP - 13206
JO - Langmuir
JF - Langmuir
IS - 46
ER -