Gravity affected break-up of laminar threads at low gas-relative-velocities

Gravity affected break-up of laminar threads at low gas-relative-velocities
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重力影响低气体相对速度下层流螺纹的破裂

DOI:
10.1016/j.ces.2011.10.021
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发表时间:
2012
影响因子:
4.7
通讯作者:
P. Walzel
P. Walzel
中科院分区:
工程技术2区
文献类型:
--
作者:
A. Mescher;A. Möller;M. Dirks;P. Walzel

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由于重力,最初缓慢的线程显着衰减,直到发生断裂。在我们的实验中,这些螺纹进一步受到气体横流的影响,覆盖了低气体相对速度(<10 m/s)的范围。螺纹轮廓数据以及在这些条件下形成的液滴尺寸分布(DSD)的信息,通过阴影图形法获得。螺纹断裂长度的实验结果证实了前人的研究结果。相比之下,对于平均液滴尺寸,观察到对气体相对速度的意外依赖性,因为发现较大的液滴用于强化的横流。DSD的宽度被发现也是敏感的气体相对速度。即使稍微加强的气体交叉流也明显增加了DSD的多分散性。
Due to gravity, initially slow threads are significantly attenuated until break-up occurs. In our experiments these threads are further subject to a gas cross-flow, covering the range of low gas-relative-velocities (<10m/s). Thread contour data as well as information on the droplet size distribution (DSD), formed under these conditions, are obtained by a shadow-graphic method. The experimental results on the break-up length of the threads confirm the results of former investigations. In contrast, for the mean drop size an unexpected dependency on the gas-relative-velocity is observed, as larger droplets were found for intensified cross-flows. The width of the DSD was found to be also sensitive on the gas-relative-velocity. Even slightly intensified gas cross-flows distinctly increase the poly-dispersity of the DSD.
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