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首页> 外文期刊>Journal of visualization >Mixing of a two-layer density-stratified fluid by two vortex rings successively launched toward the density interface
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Mixing of a two-layer density-stratified fluid by two vortex rings successively launched toward the density interface

机译：两层密度分层流体通过连续发射两个涡旋环，朝向密度接口发射

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摘要

In this study, two vortex rings composed of upper fluid were continuously ejected vertically downward toward the interface of the two-layer density-stratified fluid. The motion of the vortex rings and behavior of the lower layer fluid were investigated via visualization experiment, and the effect of time interval between the injections of the two vortex rings on the mixing of the density-stratified fluid was investigated. The first emitted vortex ring (VR_A) advected vertically downward in the upper layer, passed through the density interface, and then advected in the lower layer. After VR_A reached the maximum depth in the lower layer, the upper part of the fluid mass ejected into the upper layer due to buoyancy. The lower fluid was entrained in the upper layer. Subsequently, a new vortex ring (VR_C) was generated by the fluid mass ejected in the upper layer and advected vertically upward in the upper layer. The second vortex ring emitted (VR_B) collided with the tip of the fluid mass of the VR_A ejected from the lower layer. Subsequently, it slightly penetrated the lower layer, rolled up the lower layer fluid into the upper layer, and coalesced with VR_C to collapse. In the process of vortex merging, the mixing of the upper and lower layers reached a maximum when the VR_A reached the maximum depth. Furthermore, it was clarified that the mixing ability of the upper and lower layers depends on the ejection time interval of the two vortex rings.
机译：在该研究中，由上流体组成的两个涡旋环朝向双层密度分层流体的界面垂直向下喷射。研究了通过可视化实验研究了涡旋环的运动和下层流体的行为，研究了在密度分层流体的混合上的两个涡旋环之间的时间间隔之间的效果。第一发射的涡旋环（VR_A）在上层垂直向下方向，通过密度接口，然后在下层方向。在VR_A达到下层中的最大深度之后，由于浮力，流体质量的上部喷射到上层。下部流体夹带在上层。随后，通过在上层中喷射的流体质量产生新的涡旋环（VR_C）并在上层垂直向上。发射的第二涡旋环（VR_B）与从下层喷射的VR_A的流体质量的尖端碰撞。随后，它略微穿透下层，将下层流体卷成上层，并用VR_C聚结以塌陷。在涡流合并的过程中，当VR_A达到最大深度时，上层和下层的混合达到了最大值。此外，澄清了上层和下层的混合能力取决于两个涡旋环的喷射时间间隔。

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