Theoretical Prediction of Coarse Particle Shape Evolution During Attrition in a Stirred Vessel

摘要CTS-0350110 P。希尔，密西西比州立大学颗粒的吸附具有重要的科学和工业意义，因为它改变了颗粒的大小和形状。 产品质量和工艺可操作性都强烈依赖于颗粒的大小和形状。 尽管以前的工作的演变，由于磨损的颗粒尺寸分布，很少有研究已经做了磨损对颗粒形状的影响。 本项目的目标是通过研究搅拌容器中粗颗粒的粒度和形状的演变来纠正这一缺陷，并培训未来的工程师在固体过程的评估中考虑粒度和形状。该项目有两个主要部分：研究和教育。 该研究计划将比较和调整两种磨损理论，以确定它们是否可以预测搅拌容器中粗颗粒的尺寸和形状的演变。 研究将包括两个部分：1）调整理论以预测粗颗粒尺寸和形状的演变和2）收集实验数据以检验理论。 本研究基于断裂力学和容器特性建立了新的破损分布函数，为搅拌容器破损的预测和模拟提供了依据。 该项目的范围仅限于由于磨损而导致的粗颗粒的尺寸形状分布的演变。 碎片化不包括在内。 该教育计划包括让研究生和本科生参与积极的研究，并将粒子技术概念纳入现有课程。 这项研究预计将使学术界和工业界受益。 设计更好的固体工艺的关键是将基本物理现象和性质定量地纳入设计过程。 拟议的工作将通过提供一个基础，包括颗粒形状的变化，由于破碎和磨损的设计方法，使一个显着的补充。 该计划为本科生和研究生提供教育推广。 通过积极招募代表性不足的群体的本科生和研究生参加研究活动，增强了多样性。 该项目完成后，预计将在这一领域建立教学范例。 研究结果将发表在适当的期刊上，以传播信息。 虽然这项研究是针对搅拌容器（如结晶器）中的颗粒磨损而开发的，但它对其他具有颗粒磨损的单元操作（如破碎机、流化床、泵和混合器）具有更广泛的影响。 不仅限于化学工程操作，它还可以应用于其他行业，如制药，矿产和食品加工。

AbstractCTS-0350110P. Hill, Mississippi State UniversityAttrition of particles is of significant scientific and industrial interest because it alters the size and the shape of the particles. Both product quality and process operability strongly depend on particle size and shape. Despite previous work on the evolution of the particle size distribution due to attrition, little research has been done on the affect of attrition on particle shape. The objectives of this project are to correct this deficiency by investigating the evolution of both particle size and shape of coarse particles in a stirred vessel, and to train future engineers to account for particle size and shape in the evaluation of solids processes. The project has two major sections: research and education. The research program will compare and adapt two attrition theories to determine if they can predict the evolution in size and shape of coarse particles in a stirred vessel. The research will consist of two parts: 1) adapting the theories to predict evolution of coarse particle size and shape and 2) collection of experimental data to test the theories. This research to develop new breakage distribution functions based on fracture mechanics and vessel characteristics will provide a basis for prediction and simulation of breakage in stirred vessels. The scope of this project is limited to the evolution of the size-shape distribution of coarse particles due to attrition. Fragmentation is not included. The education program consists of engaging graduate and undergraduate students in active research, and incorporating particle technology concepts in existing courses. Intellectual Merit This research is expected to benefit both academia and industry. The key to designing better solids processes is quantitatively incorporating fundamental physical phenomena and properties into the design process. The proposed work would make a significant addition by providing a basis for including particle shape changes due to breakage and attrition in a design methodology. Broader Impact This plan provides for educational outreach to undergraduate and graduate students. Diversity is enhanced by actively recruiting undergraduate and graduate students from underrepresented groups to participate in research activities. Completion of this project is expected to lead to the development of teaching examples in this area. Results will be published in appropriate refereed journals to disseminate information. Although this research is developed for particle attrition in stirred vessels such as crystallizers, it has broader impact in other unit operations that have particle attrition such as crushers, fluidized beds, pumps, and mixers. Not limited to chemical engineering operations, it would have applications in other industries such as pharmaceutical, mineral, and food processing.