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首页> 外文期刊>九州大学工学集報 >Numerical Analysis of Flow Field during Laser ablation Synthesis of Si Nano-POarticles by fluid Mechanics Method
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Numerical Analysis of Flow Field during Laser ablation Synthesis of Si Nano-POarticles by fluid Mechanics Method

机译：流体力学方法激光烧蚀硅纳米粒子合成过程中的流场数值分析

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Abstract: A flow field generated by the pulsed laser ablated plume was analyzed by fluid dynamics equations. CIP (Cubic Interporated Propagation) numerical method was used in the calculations. By the plume expansion, a shock wave is created and propaates in an ambinent gas. The shock wave is reflected by the substrate plate, and makes the plume decelerate, deform and heat. The velocity and temperature of the plume are dependent on the distance between the target and substrate plate, since the distance dettermines the time interval of the shock interaction with the plume. Even after the pressure wave almost died out, the plume remains in high temperatue and low density, and moves very slowly to the substrate. In an ambient gas of low pressure, many vortices which are induced by the Rayleigh-Taylor instability of the interface of the plume and ambient gas, make the flow field very complex. The complicated vortex flow will promote the diffusion of plume into ambient gas, that cools down the plume. Quenching process of appropriate number density o fhte particles in the plume for clustering can be discussed by the result of present calculation.
机译：摘要：利用流体动力学方程分析了脉冲激光烧蚀羽流产生的流场。计算中使用了CIP（立方孔内扩散）数值方法。通过羽流膨胀，会产生冲击波并在混合气体中传播。冲击波被基板反射，使羽流减速，变形和发热。羽流的速度和温度取决于靶材和基板之间的距离，因为该距离决定了与羽流的冲击相互作用的时间间隔。即使在压力波几乎消失之后，羽流仍保持较高的温度和较低的密度，并非常缓慢地移动到基材上。在低压环境气体中，由于烟流与环境气体的界面的瑞利-泰勒不稳定性所引起的许多涡旋使流场变得非常复杂。复杂的涡流将促进羽流向周围气体的扩散，从而冷却羽流。通过计算结果，可以讨论羽状颗粒中适当数量密度的颗粒的淬火过程。

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