垂直円柱壁面に付着した液滴の転落体積(熱工学,内燃機関,動力など)

概要

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The critical volume of liquid droplet (CV) was investigated when the droplet starts to slide on the wall of a vertical cylinder. The critical condition was theoretically considered from the force balance between the gravitational force and the resultant of surface tension acting on the three-dimensionally curved contact line. The results show that the critical condition can be simplified to the similar one for the droplets on the inclined plates treated in the previous reports, and CV can be estimated from the maximum width of the contact area on the cylinder. The maximum width was calculated based on the energy minimum condition for the droplets in a similar manner to the inclined plate. CV was experimentally measured for each combination between two kinds of test liquids and polypropylene with different roughness. The results fairly agree with those of theory within 10% deviation. CV increases with the cylinder diameter and approaches the value for the plate asymptotically. This is due to the fact that the volume of droplets increases with the curvature under the same width of contact area.
社団法人日本機械学会の論文
2009-11-25