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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >MEASUREMENTS OF THE VELOCITY FIELD WITH MTV DURING THE SOLIDIFICATION OF AN ALLOY ANALOG WITH MUSHY REGION
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MEASUREMENTS OF THE VELOCITY FIELD WITH MTV DURING THE SOLIDIFICATION OF AN ALLOY ANALOG WITH MUSHY REGION

机译：用粘稠区模拟凝固过程中MTV的速度场测量。

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摘要

A previous application of the advanced diagnostic method, Molecular Tagging Velocimetry (MTV), showed promise with respect to providing an improved understanding of velocity fields in the complex thermo-solutal flows associated with solidification in the presence of significant buoyancy. The present study extends the earlier results (Wirtz et. al, 1998) in an ammonium-water alloy analog by demonstrating the capability of quantifying two components of the instantaneous velocity vectors of such flows. The model alloy was directionally-solidified by chilling from below. Velocity vectors were measured near the solidification front at early phases (～3minutes) of the solidification when fine structures exist. Well-defined convective flow patterns were documented with velocities on the order of 1 mm/s measured for both velocity components. Velocity vectors within and around a plume were also measured further away from the solidification front later in the solidification process (～100 minutes). The optical grid used for tagging must be refined to provide adequate spatial resolution within the plumes. The capabilities and limitations of the MTV method in its present realization are described. The results demonstrate that the MTV method is a powerful tool that can be expected to provide valuable data related to complex thermo-solutal flows associated with solidification in the presence of significant buoyancy.
机译：先进的诊断方法的以前的应用，分子标记测速法（MTV），对于在存在显着浮力的情况下提供与固化相关的复杂热溶质流中的速度场的改进理解方面显示了希望。本研究通过证明对这种流的瞬时速度矢量的两个分量进行量化的能力，扩展了铵-水合金类似物的早期结果（Wirtz等，1998）。通过从下方冷却将模型合金定向凝固。当存在精细结构时，在凝固的早期阶段（约3分钟）在凝固前沿附近测量速度矢量。对两个速度分量测得的清晰对流流型记录的速度约为1 mm / s。稍后在凝固过程中（约100分钟），还应在远离凝固前沿的位置测量羽流内部和周围的速度矢量。用于标记的光栅必须经过改进，以在羽流中提供足够的空间分辨率。描述了MTV方法在当前实现中的功能和局限性。结果表明，MTV方法是一种功能强大的工具，可以期望在存在明显浮力的情况下提供与固化相关的复杂热溶质流有关的有价值的数据。

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