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

搅拌容器中磨损过程中粗颗粒形状演变的理论预测

• 批准号: 0350110
• 负责人: Priscilla Hill
• 金额: $ 6万
• 依托单位: Mississippi State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-03-01 至 2005-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0350110&HistoricalAwards=false
• 关键词: Theoretical; Prediction; Coarse; Particle; Shape

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.

abstractcts - 0350110 p。颗粒的磨损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。产品质量和工艺的可操作性在很大程度上取决于颗粒的大小和形状。尽管前人对磨耗对颗粒粒度分布的影响进行了研究，但对磨耗对颗粒形状的影响研究甚少。该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评估固体过程中考虑粒度和形状。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摩擦理论，以确定它们是否可以预测搅拌容器中粗颗粒的大小和形状的演变。研究将包括两个部分：1)将理论应用于预测粗颗粒大小和形状的演变，2)收集实验数据来验证理论。本研究基于断裂力学和容器特性建立新的破碎分布函数，将为搅拌容器破碎预测和模拟提供依据。这个项目的范围仅限于由于磨擦引起的粗颗粒尺寸形状分布的演变。碎片不包括在内。教育计划包括让研究生和本科生积极参与研究，并将粒子技术概念纳入现有课程。这项研究有望使学术界和工业界都受益。设计更好的固体工艺的关键是定量地将基本的物理现象和性质纳入设计过程。提议的工作将通过在设计方法中提供包括由于破损和磨损而引起的颗粒形状变化的基础，从而做出重要的补充。更广泛的影响本计划为本科生和研究生提供教育推广。通过积极从代表性不足的群体中招募本科生和研究生参与研究活动，增强了多样性。本项目的完成有望带动该领域教学范例的发展。结果将在适当的期刊上发表，以传播信息。虽然这项研究是针对搅拌容器（如结晶器）中的颗粒磨损而开展的，但它对其他具有颗粒磨损的单元操作（如破碎机、流化床、泵和搅拌机）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、矿物和食品加工。