Particle Sizing and Velocity Measurement in Multiple Scattering Flowing Media

多重散射流动介质中的颗粒尺寸和速度测量

• 批准号: 0120846
• 负责人: Ronald Dougherty
• 金额: $ 6.99万
• 依托单位: University of Kansas Center for Research Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-12-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0120846&HistoricalAwards=false
• 关键词: Particle; Sizing; Velocity; Measurement; Multiple

AbstractCTS-0120846R. Dougherty, University of Kansas Center for Research Inc.Physical characterizing of the suspended particles in liquid is required for many particulate processing systems such as applications in pharmaceutical, chemical, oil, and other industries. Dynamic light scattering has been successfully used in the laboratory with limited success in industrial processes involving particulate transport. Although for single scattered light, the particle size can be accurately determined. However, multiple scattering occurring in suspension transport prevents accurate particle size or velocity measurements.To resolve this problem, previous efforts have been focused on development of correlation theories in multiple scattered problem with limited success. A novel approach is proposed here where the signals from two detectors with small but finite angular separation are cross-correlated to detect only the single scattered speckle patter. This method is proposed in combination of 'flow suppression' technique where the scattered wave vector perpendicular to the flow direction is used to avoid the disturbance due to the fluid velocity, allowing more accurate measurement of the particle size in a flowing suspension. The preliminary results for submicron particles at low velocities show some potential.

摘要CTS-0120846 R。液体中悬浮颗粒的物理特性是许多颗粒处理系统所必需的，例如在制药、化工、石油和其他行业中的应用。 动态光散射已成功地用于实验室中，但在涉及颗粒输送的工业过程中取得的成功有限。 虽然对于单个散射光，可以精确地确定颗粒尺寸。 然而，悬浮液传输过程中的多次散射现象阻碍了颗粒粒径或速度的精确测量，为了解决这一问题，以往的研究主要集中在多次散射问题的相关理论的发展上，但成果有限。 提出了一种新的方法，其中来自两个检测器的信号具有小但有限的角度间隔互相关，以检测仅单个散射散斑图案。 该方法结合“流动抑制”技术提出，其中使用垂直于流动方向的散射波矢量来避免由于流体速度引起的干扰，从而允许更准确地测量流动悬浮液中的颗粒尺寸。 在低速下的亚微米颗粒的初步结果显示了一些潜力。