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Experimental studies of bubble dynamics inside a corner.
Ultrasonics Sonochemistry ( IF 8.4 ) Pub Date : 2019-12-28 , DOI: 10.1016/j.ultsonch.2019.104951
Jie Cui 1 , Zhi-Peng Chen 1 , Qianxi Wang 2 , Tao-Ran Zhou 1 , Callan Corbett 2
Affiliation  

The dynamics of a bubble near a corner formed by two flat rigid boundaries (walls), is studied experimentally using a spark-generated bubble. The expansion, collapse, rebound, re-collapse and migration of the bubble, along with jetting and protrusion, are captured using a high-speed camera. Our experimental observations reveal the behaviour of the bubble in terms of the corner angle and the dimensionless standoff distances to the near and far walls in terms of the maximum bubble radius. The bubble remains approximately spherical during expansion except for its surface becoming flattened when in close proximity to a wall. When a bubble is initiated at the bisector of the two walls, the bubble becomes oblate along the bisector during the late stages of collapse. A jet forms towards the end of collapse, pointing to the corner. The closer the bubble to the two walls, the more oblate along the bisector the bubble becomes, and the wider the jet. A bubble initiated near one of the two walls is mainly influenced by the nearer wall. The jet formed is pointing to the near wall but inclined towards the corner. After the jet penetrates through the bubble surface, the bubble becomes a bubble ring, and a bubble protrusion forms following the jet. The bubble ring collapses and subsequently disappears, while the protrusion firstly expands, and then collapses and migrates to the corner.

中文翻译:

角落内气泡动力学的实验研究。

使用火花产生的气泡,对通过两个平坦的刚性边界(壁)形成的拐角附近的气泡动力学进行了实验研究。气泡的膨胀,塌陷,回弹,重新塌陷和迁移,以及喷射和突出都可以通过高速摄像头捕获。我们的实验观察结果揭示了气泡的行为,包括转角和最大气泡半径到远近壁的无量纲间隔距离。气泡在膨胀过程中保持近似球形,除了在靠近壁时其表面变平。当在两个壁的等分线处产生气泡时,气泡在坍塌的后期沿等分线变为扁圆。一股急流朝崩溃的尽头形成,指向角落。气泡离两壁越近,气泡沿等分线越扁,并且射流越宽。在两个壁之一附近产生的气泡主要受较近壁的影响。形成的射流指向近壁,但向角落倾斜。射流穿透气泡表面后,气泡变成气泡环,并且在射流之后形成气泡突起。气泡环塌陷并随后消失,而突起首先扩展,然后塌陷并迁移到角落。射流穿透气泡表面后,气泡变成气泡环,并且在射流之后形成气泡突起。气泡环塌陷并随后消失,而突起首先扩展,然后塌陷并迁移到角落。射流穿透气泡表面后,气泡变成气泡环,并且在射流之后形成气泡突起。气泡环塌陷并随后消失,而突起首先扩展,然后塌陷并迁移到角落。
更新日期:2019-12-29
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