Droplet collisions and interaction with the turbulent flow within a two-phase wind tunnel
Droplet collisions and interaction with the turbulent flow within a two-phase wind tunnel
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DOI：
10.1063/1.3609275
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发表时间：
2011-08
影响因子：
4.6
通讯作者：
R. Bordás;T. Hagemeier;Bernd Wunderlich;D. Thévenin
中科院分区：
文献类型：
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作者：
R. Bordás;T. Hagemeier;Bernd Wunderlich;D. Thévenin
有关气象问题的风洞实验在文献中并不常见。然而，这样的实验可能是必不可少的，例如在湍流中液滴-液滴相互作用的仔细研究。这个问题是至关重要的许多配置，特别是要了解暖雨启动。由于涉及的长度尺度很大，在风洞中完全再现云湍流显然是不可能的。然而，没有必要为了量化液滴相互作用而恢复整个光谱。为此目的，只要正确地说明有关的财产就足够了。在本文中，这些属性和方法，设置在两相风洞中的第一个描述。特别是，液滴的大小和数量密度，速度，湍流动能，k，和它的耗散率，k，适当地再现，所示的非侵入式测量技术。一个完整的实验性质…
Experiments in wind tunnels concerning meteorological issues are not very frequent in the literature. However, such experiments might be essential, for instance for a careful investigation of droplet-droplet interactions in turbulent flows. This issue is crucial for many configurations, in particular to understand warm rain initiation. It is clearly impossible to completely reproduce cloud turbulence within a wind tunnel due to the enormous length scales involved. Nevertheless, it is not necessary to recover the whole spectrum in order to quantify droplet interactions. It is sufficient for this purpose to account correctly for the relevant properties only. In the present paper, these properties and a methodology for setting those in a two-phase wind tunnel are first described. In particular, droplet size and number density, velocities, turbulent kinetic energy, k, and its dissipation rate, ɛ, are suitably reproduced, as demonstrated by non-intrusive measurement techniques. A complete experimental characte...