On the collision of laminar jets: fluid chains and fishbones
On the collision of laminar jets: fluid chains and fishbones
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DOI：
10.1017/s002211200400967x
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发表时间：
2004-07-25
影响因子：
3.7
通讯作者：
Hasha, AE
中科院分区：
文献类型：
--
作者：
Bush, JWM;Hasha, AE
我们提出的结果相结合的实验和理论研究的家庭的自由表面流动产生的倾斜碰撞层流射流。我们提出了一个参数研究的流量，并描述了丰富的各种形式观察到的。当射流雷诺数足够高时，射流碰撞产生薄流体片，该薄流体片在表面张力和流体惯性的组合影响下演化。由此产生的流动可能采取流体链的形式：一系列相互正交的链接，每个链接由相对较厚的流体边缘约束的薄椭圆形膜组成。实验研究了流体链的形式对控制参数的依赖性。一个伴随的理论模型描述的形式，由稳定的轮辋约束的流体片被发现产生良好的协议与所观察到的链形状。在另一个参数区，流体链结构变得不稳定，产生了一个引人注目的新的流动结构，类似于流体鱼骨。鱼骨被证明是一个Rayleigh-Plateau不稳定性的表的边界边缘被放大的向心力与流沿着弯曲的边缘。
We present the results of a combined experimental and theoretical investigation of the family of free-surface flows generated by obliquely colliding laminar jets. We present a parameter study of the flow, and describe the rich variety of forms observed. When the jet Reynolds number is sufficiently high, the jet collision generates a thin fluid sheet that evolves under the combined influence of surface tension and fluid inertia. The resulting flow may take the form of a fluid chain: a succession of mutually orthogonal links, each composed of a thin oval film bound by relatively thick fluid rims. The dependence of the form of the fluid chains on the governing parameters is examined experimentally. An accompanying theoretical model describing the form of a fluid sheet bound by stable rims is found to yield good agreement with the observed chain shapes. In another parameter regime, the fluid chain structure becomes unstable, giving rise to a striking new flow structure resembling fluid fishbones. The fishbones are demonstrated to be the result of a Rayleigh-Plateau instability of the sheet's bounding rims being amplified by the centripetal force associated with the flow along the curved rims.