非离析颗粒混合物的设计
Designing non-segregating granular mixtures
摘要：
在尺寸或密度变化的双分散颗粒混合物中，大颗粒上升（由渗流驱动），重颗粒下沉（由浮力驱动）。当两种颗粒种类在尺寸和密度上彼此不同时，两种分离机制或者彼此增强（大/轻和小/重）或者彼此相反（大/重和小/轻）。在后一种情况下，存在两种偏析机制平衡并且颗粒不再偏析的平衡条件。这导致了一种方法来设计非偏析颗粒混合物，通过指定颗粒尺寸比，密度比，和混合物浓度，以达到平衡条件。使用DEM模拟准二维有界堆流，我们表明，隔离显着减少颗粒混合物附近的平衡条件。此外，颗粒尺寸和密度比的范围内的上升-下沉过渡相匹配的组合尺寸和密度偏析模型的预测。
英文摘要：
In bidisperse particle mixtures varying in size or density alone, large particles rise (driven by percolation) and heavy particles sink (driven by buoyancy). When the two particle species differ from each other in both size and density, the two segregation mechanisms either enhance (large/light and small/heavy) or oppose (large/heavy and small/light) each other. In the latter case, an equilibrium condition exists in which the two segregation mechanisms balance and the particles no longer segregate. This leads to a methodology to design non-segregating particle mixtures by specifying particle size ratio, density ratio, and mixture concentration to achieve the equilibrium condition. Using DEM simulations of quasi-2D bounded heap flow, we show that segregation is significantly reduced for particle mixtures near the equilibrium condition. In addition, the rise-sink transition for a range of particle size and density ratios matches the combined size and density segregation model predictions.
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