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首页> 外文期刊>Optics and Lasers in Engineering >Determination of forced convection parameters by interferometric imaging of the concentration field during growth of KDP crystals
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Determination of forced convection parameters by interferometric imaging of the concentration field during growth of KDP crystals

机译：通过KDP晶体生长过程中浓度场的干涉成像确定强制对流参数

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Growth of a potassium dihydrogen phosphate (KDP) crystal from its aqueous solution has been considered under forced convection conditions. The KDP crystal is grown in a conventional top hanging geometry. Forced convection conditions are created by rotating the crystal about a vertical axis. The rotational RPM is varied in a cycle, creating an accelerated rotation (AR) paradigm. The effect of varying the rotational RPM on the concentration field around the crystal was investigated. Mach-Zehnder interferometry was adopted as an optical technique to image the evolving concentration fields. Six different experiments were performed to obtain the specific set of time periods and rotation rates of the acceleration cycle that result in a uniform concentration field around the growing crystal. The Reynolds number, an index of the strength of forced convection, was optimized through the experiments. The optimized parameters of the accelerated rotation cycle were found to be as follows: maximum rotation rate of 32 RPM, spin up period=40s, spin down period=40s, steady period=40s, and stationary period=40 s. The parametric study further revealed that concentration was highly sensitive to the maximum rotation rate adopted during the AR cycle. It did not depend crucially on the time periods that could be varied by as much as ± 25% around the respective average values. Finally, a KDP crystal was grown using the optimized forced convection parameters and the crystal quality was found to be good.
机译：已经考虑在强制对流条件下从其水溶液中生长磷酸二氢钾（KDP）晶体。 KDP晶体以常规的顶部悬挂几何形状生长。通过围绕垂直轴旋转晶体来创建强制对流条件。旋转RPM周期变化，从而创建加速旋转（AR）范例。研究了改变旋转RPM对晶体周围浓度场的影响。 Mach-Zehnder干涉法被用作一种光学技术来成像不断变化的浓度场。进行了六个不同的实验，以获取一组特定的时间周期和加速周期的旋转速率，从而在生长的晶体周围产生均匀的浓度场。雷诺数是强制对流强度的指标，通过实验进行了优化。发现加速旋转周期的优化参数如下：最大旋转速率为32 RPM，加速周期= 40s，减速周期= 40s，稳定周期= 40s和稳定周期= 40 s。参数研究进一步表明，浓度对AR循环中采用的最大转速高度敏感。它并不严格取决于可以在各自平均值附近相差±25％的时间段。最后，使用优化的强制对流参数生长KDP晶体，发现晶体质量良好。

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