液柱内温度差マランゴニ対流における粒子集合現象(熱工学,内燃機関,動力など)

概要

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Thermocapillary convection in a liquid bridge is induced by non-uniform surface tension distribution over the free surface owing to a temperature difference between two cylindrical rods sustaining the liquid bridge. The induced flow is usually visualized by using fine particles as tracers. Under certain flow conditions, the tracer particles were found to form particle accumulation stuctures (PAS). Four types of PAS were found in different flow fields. The conditions for the occurrence of PAS were investigated carefully with focusing on the Twisted String PAS (TS-PAS) in which the particles gathered along a closed single path. Various particles were employed as tracers. Most of the tested particles were accumulated on the orbit of the TS-PAS independently of their diameter, density and material. The TS-PAS exhibited several types of closed path lines. In the present study, the relation between the TS-PAS and the flow field was revealed. The flow field itself exhibited the structure quite similar to the TS-PAS and the particle followed the flow field. Thus, the particle-particle and the particle-flow interaction were not a dominant factor to form the TS-PAS.
一般社団法人日本機械学会の論文
2004-04-25