気流による液滴の臨界分裂に関する研究

概要

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The breakup conditions of a liquid droplet due to airstreams are investigated in detail. Experiments are conducted using a horizontal air suction wind tunnel. Uniformly sized liquid droplets produced by longitudinal vibration of a nozzle and uniform drops from a nozzle are used. The shuttering processes of liquid droplets are observed using a stroboscope and photographed by a still camera. The typical critical breakup pattern of a droplet in this experiment is of a bag type. The critical relative velocity increases as the diameter of a droplet decreases. The critical Weber number is not constant as stated in Hinze's theory, but increases as the droplet diameter decreases. The critical Weber number in the horizontal air suction wind tunnel is larger than that in the vertical air suction wind tunnel, and in the airstreams induced by a shock wave. The transition breakup zone which expands with decresing droplet size is also examined precisely. The relationships between droplet diameter and, for example, the relative velocity difference the rate of relative velocity difference, are shown quantitatively.
一般社団法人日本機械学会の論文
1997-11-25