Abstract: The rising motion of single bubble in still liquid is a natural phenomenon, which has high theoretical research significance and engineering application prospect. Experimental observations and numerical simulations for prediction of the rising trajectory of a single bubble in still liquid are being carried out, while the concise but accurate theoretical or mechanism model is still not well developed. In this article, a theoretical model of a single bubble based on experimental observation of flow around bluff body is proposed to predict the rising trajectory of zigzagging bubbles in still water. The prediction correlation of bubble lateral movement frequency and bubble steer angle are established based on three degrees of freedom frame. The model has achieved good trajectory prediction effect in the bubble rising experiment. The average simulation time per unit moving time of bubble is 2.5 s.

Key words: Single bubble, Theoretical model, Zigzagging, Three degrees of freedom frame

摘要： The rising motion of single bubble in still liquid is a natural phenomenon, which has high theoretical research significance and engineering application prospect. Experimental observations and numerical simulations for prediction of the rising trajectory of a single bubble in still liquid are being carried out, while the concise but accurate theoretical or mechanism model is still not well developed. In this article, a theoretical model of a single bubble based on experimental observation of flow around bluff body is proposed to predict the rising trajectory of zigzagging bubbles in still water. The prediction correlation of bubble lateral movement frequency and bubble steer angle are established based on three degrees of freedom frame. The model has achieved good trajectory prediction effect in the bubble rising experiment. The average simulation time per unit moving time of bubble is 2.5 s.

关键词: Single bubble, Theoretical model, Zigzagging, Three degrees of freedom frame