Head-on collisions of dense granular jets.
Head-on collisions of dense granular jets.
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DOI：
10.1103/physreve.93.012907
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发表时间：
2015-08
期刊：
影响因子：
--
通讯作者：
J. Ellowitz
中科院分区：
文献类型：
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作者：
J. Ellowitz
我们研究二维等速但不等宽度不可压缩射流的正面影响，重点关注致密颗粒射流。我们使用离散粒子模拟来表明，颗粒射流的正面撞击会产生准稳态，其中来自较大射流的多余入射动量的一部分被随时间稳定漂移的撞击中心捕获。通过改变离散粒子模拟中的耗散以及通过不同流变学的附加类似连续射流影响，我们表明该中心漂移速度显着主要取决于总耗散率的 1.5 次方，并且在很大程度上与耗散机制无关。最后，我们提出了一个简单的控制体积分析，该分析定性地捕获了漂移速度的出现，但没有捕获缩放。
We study head-on impacts of equal-speed but unequal-width incompressible jets in two dimensions with a focus on dense granular jets. We use discrete particle simulations to show that head-on impact of granular jets produces a quasi-steady-state where a fraction of the excess incident momentum from the larger jet is captured by an impact center that drifts steadily over time. By varying the dissipation in our discrete particle simulations and through additional analogous continuum jet impacts of different rheologies, we show that this central drift speed is remarkably dependent primarily on the total dissipation rate to the power 1.5, and largely independent of the dissipation mechanism. We finish by presenting a simple control volume analysis that qualitatively captures the emergence of the drift speed but not the scaling.