论文标题
关于在尘土盘的小谷物的结算：分析和公式
On the settling of small grains in dusty discs: analysis and formulas
论文作者
论文摘要
仪器可以在年轻恒星圆盘的顶层中对微米尺寸的尘埃颗粒进行更清晰的观察。为了提供准确的模型，我们重新审视小晶粒的尘埃沉降理论，当应同时处理气体分层，灰尘惯性和有限相关时间时。我们从力量的平衡开始，并在稳态下得出分布。渐近膨胀需要谨慎，因为限制不通勤。特别是，当湍流纯粹是扩散时，出现非物理颠簸的分布。如数值模拟所预测的那样，这不包括真实盘的非常短的相关时间。
Instruments achieve sharper and finer observations of micron-in-size dust grains in the top layers of young stellar discs. To provide accurate models, we revisit the theory of dust settling for small grains, when gas stratification, dust inertia and finite correlation times for the turbulence should be handled simultaneously. We start from a balance of forces and derive distributions at steady-state. Asymptotic expansions require caution since limits do not commute. In particular, non-physical bumpy distributions appear when turbulence is purely diffusive. This excludes very short correlation times for real discs, as predicted by numerical simulations.
