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		浮力气泡对水平壁面的回弹动力学特性 1)
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			BOUNCING BEHAVIORS OF A BUOYANCY-DRIVEN BUBBLE ON A HORIZONTAL SOLID WALL 1)
			 
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		 图 11. 首次碰撞至回弹过程中的速度矢量图, 虚线圈表示旋涡$V_{1}$, 实线圈表示旋涡$V_{2}$  | 
	
Fig. 11. Velocity vectors during the first collision-bouncing,the dashed and the solid curves denote the vortex $V_{1}$and $V_{2}$, respectively  | 
	
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