浅焦点結像法による壁面スライド気泡流の内部構造計測(流体工学,流体機械)

概要

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Wall-sliding bubbly flow is experimentally investigated using a shallow focus imaging technique. The technique allows to capture the motion of tracer particles inside a thin layer from a wall. Adding digital image processing provides further fine spatial resolution up to 100 ratio of the length of the viewing area to the focused thickness. Bubble-bubble interaction, which is one of dominant phenomena in wall-sliding bubbles, is analyzed with using Particle Tracking Velocimetry applied to both phases. Transition of bubbles' pattern from vertically chained to horizontally clustered arrangement is discussed with the local liquid phase flow structure around individual bubble. The results reveal that the temporally high fluctuation velocity in the liquid phase generates during the transition, and the circulation of bubble-vicinity liquid induces rapid transition of the arrangement.
社団法人日本機械学会の論文
2005-10-25