Contact, Meniscus and Solidification Stability in Planar-Flow Processing

平面流过程的生产率取决于一组三相和两相构型的动力学和稳定性。 这些的稳定性和控制在带材铸造（或熔融纺丝）、冲击成型、压铸、喷雾发泡和挤出等中至关重要;也就是说，在几乎任何铸造工艺中，整体性能和表面质量的完整性是至关重要的。本研究的目的是：（1）了解上游弯月面处空气娱乐的流体力学;（2）发展限制下游强制的某些相容性关系的含义;（3）确定负责所观察到的由光滑到粗糙纹理的压力转变的物理机制;以及（4）捕获流体流动对凝固前沿形态稳定性的反馈影响。 最终目标是了解加工对微观结构的影响：晶粒的数量，尺寸和取向;控制表面质量并扩大工艺可操作性窗口;以及更好地控制相变，工艺稳定性，从而控制生产的带材，箔材和板材的质量。工程方面的改进预计将与科学进步齐头并进。

Producibility of the planar-flow process depends on the dynamics and stability of a group of three-phase and two-phase configurations. The stability and control of these are crucial in strip-casting (or melt-spinning), impact-forming, die-casting, spray-foaming, and extrusion, among others; that is, in virtually any casting process where integrity of bulk properties and surface quality are paramount. The objectives of this research are: (1) to understand the fluid mechanics of air entertainment at the upstream meniscus; (2) to develop implications of certain compatibility relations that constrain the downstream injunction; (3) to identify the physics responsible for an observed transition from smooth to rough texture with applied pressure; and (4) to capture the feedback influence of fluid flow on the morphological stability of the solidification front. The ultimate goals are to understand the influence of processing on microstructure: the number, size and orientation of grains; to control surface quality and to widen the process operability window; and, to better control the phase-change, process stability and thereby quality of the ribbon, foil and sheet produced. Improvements on the engineering side are expected to go hand-in-hand with scientific advances.