多孔粉尘块材料特性的数值确定
Numerical determination of the material properties of porous dust cakes
摘要：
微行星的形成需要尘埃粒子通过碰撞的增长。100微米大小的粒子的质量必须增加许多数量级。为了理解和模拟生长过程中的过程，必须很好地理解聚集体与周围气体的机械性质和相互作用截面。实验室研究的最新进展现在为将数值聚集模型推向一个新的水平提供了背景。我们提出了一个以前测试过的模型的总动力学的校准。我们采用表面微凸体的塑性形变作为物理模型，使粘附临界速度与实验结果相一致。修改后的代码，然后用于计算压缩强度和声速在不同密度的骨料。我们比较这些预测与实验结果，并得出结论，新的代码是能够研究小聚集体的性质。
英文摘要：
The formation of planetesimals requires the growth of dust particles through collisions. Micron-sized particles must grow by many orders of magnitude in mass. In order to understand and model the processes during this growth, the mechanical properties, and the interaction cross sections of aggregates with surrounding gas must be well understood. Recent advances in experimental (laboratory) studies now provide the background for pushing numerical aggregate models onto a new level. We present the calibration of a previously tested model of aggregate dynamics. We use plastic deformation of surface asperities as the physical model to bring critical velocities for sticking into accordance with experimental results. The modified code is then used to compute compression strength and the velocity of sound in the aggregate at different densities. We compare these predictions with experimental results and conclude that the new code is capable of studying the properties of small aggregates.
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