CAREER: A Multi-scale Approach to Particle Breakage in Stirred Vessels and Its Integration into Education

摘要-0448740职业生涯：搅拌容器中颗粒破碎的多尺度方法及其与教育的结合主要研究者：Priscilla J. Hill颗粒的破碎和破碎具有重要的科学和工业意义。过程应用涵盖了一系列行业，包括化肥、化工和制药行业。颗粒破碎在化学过程工业中如此重要的原因之一是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尺寸和形状，但很少有研究破碎对颗粒形状的影响。该项目的目标是通过调查搅拌容器中颗粒尺寸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颗粒尺寸和形状。该项目有两个主要部分：研究和教育。 理论，建模和实验的研究计划旨在：1）确定Ostwald熟化对饱和溶液中破碎实验的影响，以及2）使用基于第一原理的数学模型将搅拌容器中破碎的宏观模型与微观颗粒断裂力学联系起来。该模型将通过实验进行检验。研究和教育计划通过将新的研究成果引入研究生和本科课程，并通过选择学生积极参与正在进行的研究来整合。具体而言，该教育计划包括：1）开发一门新的颗粒和结晶技术研究生选修课程，2）基于研究计划模型开发教育软件，3）让研究生和本科生参与积极的研究，4）开发用于K-12学生的颗粒技术教育模块。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，使一个重要的补充。尽管这项研究是针对结晶器等搅拌容器中的颗粒破碎和磨损而开发的，但它对破碎机、流化床、泵和混合器等其他具有颗粒破碎的单元操作具有更广泛的影响。预计这项工作将导致商业化学过程模拟公司的潜在利益的模型。不仅限于化学工程操作，它还可以应用于其他行业，如矿物和食品加工。更广泛的影响：该计划为各种教育水平的学生提供教育推广：K-12，本科生和研究生。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，并通过在K-12教育活动中包括代表性不足的群体的学生来加强多样性。由于粒子技术知识和教育的不足损害了美国的全球竞争地位，该项目通过提高对粒子行为的理解和建模以及教育人们更好地解决粒子技术问题来为社会做出贡献。

ABSTRACT-0448740CAREER: A Multi-scale Approach to Particle Breakage in Stirred Vessels and ItsIntegration into EducationPrincipal Investigator: Priscilla J. HillAttrition and fragmentation of particles are of significant scientific and industrial interest. Process applications span a range of industries including the fertilizer, chemical, and pharmaceutical industries. One of the reasons that particle breakage is so important in the chemical process industries is that it alters the size and the shape of the particles. Both product quality and process operability strongly depend on particle size and shape, yet little research has been done on the affect of breakage on particle shape. The objectives of this project are to correct this deficiency by investigating the evolution of both particle size and shape 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 of theory, modeling, and experimentation aims to: 1) determine the effect of Ostwald ripening on breakage experiments in a saturated solution, and 2) to link a macroscale model of breakage in a stirred vessel to microscale particle fracture mechanics using mathematical models based on first principles. This model will be tested experimentally. The research and education programs are integrated by introducing new research results into the graduate and undergraduate curriculum and by having selected students actively participate in ongoing research. Specifically the education program consists of: 1) developing a new graduate elective course in particle and crystallization technology, 2) developing educational software based on the research program models, 3) engaging graduate and undergraduate students in active research, and 4) developing educational modules in particle technology for use with K-12 students.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. Although this research is developed for particle fragmentation and attrition in stirred vessels such as crystallizers, it has broader impact in other unit operations that have particle breakage such as crushers, fluidized beds, pumps, and mixers. It is expected that this work would lead to models of potential interest to commercial chemical process simulation companies. Not limited to chemical engineering operations, it would have applications in other industries such as minerals and food processing.Broader Impact: This plan provides for educational outreach to students at a wide range of educational levels: K-12, undergraduate, and graduate students. Diversity is enhanced by actively recruiting undergraduate and graduate students from underrepresented groups to participate in research activities, and by including students from underrepresented groups in the K-12 educational activities. Since deficiencies in particle technology knowledge and education harm the global competitive position of the U.S., this project contributes to society by improving the understanding and modeling of particle behavior and by educating people to better address particle technology issues.