The development of multiscale constitutive models for powder processing: from particles to products

粉末加工多尺度本构模型的开发：从颗粒到产品

• 批准号: EP/C545249/1
• 负责人: Chuan-Yu Wu
• 金额: $ 22.47万
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FC545249%2F1
• 关键词: development; multiscale; constitutive; models; powder

In a number of industrial sectors, such as pharmaceuticals, chemicals, food, ceramics and powder metallurgy, processing of dry powders is a general route to making products. To manufacture high quality products using this processing technique is a challenging task because of the complexity and diversity of material properties and processing conditions. Rapid growth and expansion in these industries and intensive competition demands high effectiveness and stringent quality control of the process. Conventional empirical design routes, which generally employ trial-and-error approaches, cannot meet these requirements. A rigorous model is urgently needed to accurately predict the powder behaviour during processing and the performance of final products from the properties of the constituent particles, especially of small quantities in the early stages of product development. The primary goal of the proposed project is to develop robust mufti-scale constitutive models which will be based upon combining different numerical methods: discrete and continuum. The former will be used to model at micro-scale, in which the powder is treated as a assembly of individual particles interacting each other. The latter will be developed as a platform to explore the powder behaviour and the performance of the product at the macroscale, for which the constitutive coefficients will be determined based upon simulations with the discrete methods. The powders used in various industries mentioned above are of various types, such as elastic, elastoplastic, viscoelastic and viscoplastic, and with different bonding mechanisms, such as bonding through van der Waals' force or adhesion due to the presence of interfacial energy. In order that the mufti-scale model to be developed can take these factors into account, rigorous contact laws between these particles will also be developed and incorporated into the mufti-scale models, so that the influence of materials properties of the particles and the bonding mechanisms can be analysed and the developed model can be used in a variety of applications. Furthermore, most industrial processing is carried out in air. During the rapid flow of powder in the early stages of processing, where the powder is delivered from one apparatus to another, the air flow may be important. To explore this effect, numerical models will also be developed to simulate the gas/solid two phase flow. This allows the effects of air flow on the powder behaviour and the performance of the final products to be identified. The developed model will be quantitatively validated by experimental testing using Positron Emission Particle Testing (PEPT), a method developed at the University of Birmingham. The mufti-scale model developed will enhance understanding of powder processing and will be a valuable tool for process design and product development in a number of industries.

在制药、化工、食品、陶瓷和粉末冶金等许多工业部门，干粉加工是制造产品的一般途径。由于材料性质和加工条件的复杂性和多样性，使用这种加工技术制造高质量的产品是一项具有挑战性的任务。这些行业的快速增长和扩张以及激烈的竞争需要高效率和严格的质量控制。传统的经验设计路线，通常采用试错法，不能满足这些要求。迫切需要一个严格的模型来准确地预测粉末在加工过程中的行为和最终产品的性能，特别是在产品开发的早期阶段的小数量的组成颗粒的性质。拟议项目的主要目标是开发强大的多尺度本构模型，这将是基于结合不同的数值方法：离散和连续。前者将用于微观尺度的建模，其中粉末被视为相互作用的单个颗粒的集合。后者将被开发为一个平台，以探索粉末的行为和性能的产品在宏观尺度上，本构系数将被确定的基础上与离散方法的模拟。上述各种工业中使用的粉末具有各种类型，例如弹性、弹塑性、粘弹性和粘塑性，并且具有不同的结合机理，例如通过货车德瓦尔斯力的结合或由于界面能的存在而产生的粘附。为了使所开发的多尺度模型能够考虑这些因素，这些颗粒之间的严格接触定律也将被开发并纳入多尺度模型中，从而可以分析颗粒的材料性质和结合机制的影响，并且所开发的模型可以用于各种应用。此外，大多数工业加工是在空气中进行的。在处理的早期阶段中粉末的快速流动期间，其中粉末从一个设备输送到另一个设备，空气流可能是重要的。为了探索这种效应，还将开发数值模型来模拟气/固两相流。这允许确定气流对粉末行为和最终产品性能的影响。所开发的模型将通过使用正电子发射粒子测试（PEPT）的实验测试进行定量验证，该方法是在伯明翰大学开发的。开发的多尺度模型将增强对粉末加工的理解，并将成为许多行业中工艺设计和产品开发的宝贵工具。

项目成果

A Coupled DEM/CFD Analysis of the Effect of Air on Powder Flow During Die Filling

• DOI: 10.1002/aic.11734
• 发表时间: 2009-01-01
• 期刊: AICHE JOURNAL
• 影响因子: 3.7
• 作者: Guo, Y.;Kafui, K. D.;Seville, J. P. K.
• 通讯作者: Seville, J. P. K.