噴射液の自己不安定化機構の理論的研究 : 第4報 : ノズル出口での継続的な不安定波生成

概要

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Concluding this series of theoretical studies, a persistent self-excitation mechanism of most unstable capillary wave at the nozzle exit is proposed on the basis of the one-dimensional model developed in the first report. It is found that, once an unstable wave travels down from the nozzle exit, the most unstable Rayleigh wave is repeatedly developed for the newly issued liquid from the capillary wave which is generated to meet the nozzle exit condition at any time. The initial amplitude of this unstable wave is the same as that of the initial unstable wave when the jet speed is equal or slower than the steady capillary wave speed. For larger jet speed, the amplitude of newly generated unstable wave decays gradually one after one, so that a periodical agitation is necessary to maintain the steady Rayleigh-type breakup of the liquid, which is usually attainable by the arrival of capillary waves from the contracting liquid jet tip to the nozzle exit.
社団法人日本航空宇宙学会の論文
2008-09-05