利用超重力进行流体对流的空间和时间尺度物理模拟
Spatial and temporal scaled physical modeling of fluid convection using hypergravity
摘要：
比例尺物理模型是理解自然界中流体行为的重要手段。然而，一个常见的错误来源是相互矛盾的相似性标准。在这里，我们提出使用超重力来改善重力主导的流体对流的标度相似性，例如自然对流和多相流。我们证明了该方法的有效性，通过调查水盐水浮力射流实验超重力下创建的离心机。结果表明，尺度相似性随重力加速度的增加而增加。特别是，该模型最好地代表原型下N3 g的空间尺度为1/N和时间尺度为1/N2，同时满足弗劳德和雷诺准则。从科氏力和湍流的角度讨论了离心半径和流体速度在决定缩尺模型精度中的重要性。该研究为重力作用下流体的物理模拟提供了一个新的方向，具有广阔的应用前景。
英文摘要：
Scaled physical modeling is an important means to understand the behavior of fluids in nature. However, a common source of errors is conflicting similarity criteria. Here, we present using hypergravity to improve the scaling similarity of gravity-dominated fluid convection, e.g. natural convection and multi-phase flow. We demonstrate the validity of the approach by investigating water-brine buoyant jet experiments conducted under hypergravity created by a centrifuge. Results show that the scaling similarity increases with the gravitational acceleration. In particular, the model best represents the prototype under N3g with a spatial scale of 1/N and a time scale of 1/N2 by simultaneously satisfying the Froude and Reynolds criteria. The significance of centrifuge radius and fluid velocity in determining the accuracy of the scaled model is discussed in the light of Coriolis force and turbulence. This study demonstrates a new direction for the physical modeling of fluids subject to gravity with broad application prospects.
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