哈尔滨工业大学（深圳）学术讲座

演讲人Speaker：邬传宇 教授

题目Title: Numerical Analysis of Heat Generation and Thermomechanical Behaviour in Granular Materials

时间Date：2024年 12月 18日      Time：上午 10：00 ~ 12：00

地点Venue：信息楼L0329-L0330室  

内容摘要Abstract：

In many granular material handling processes, friction and inelastic collisions cause heat generation and temperature rise, yet the self-heating phenomenon is not well understood. This study develops and validates a model that couples friction-induced heat generation and transfer with the Discrete Element Method (DEM). The model is validated qualitatively using temperature distribution patterns and quantitatively by tracking temperature increases in particles from experimental data.

Key findings show that the coefficient of variation (CV) of particle temperature decreases and stabilises within five minutes of drum rotation, indicating uniform heat distribution. Simulated wall temperature distributions match the annular patterns observed via infrared thermography. Increasing the drum rotation speed expands the heated region on the wall and increases the heat absorbed by particles. Experiments with lead, steel, plastic, and glass particles under varying rotation speeds and fill ratios show that denser particles generate more heat and higher speeds promote temperature rise, while fill ratio has little effect on thermal response.

Additionally, a finite element (FE) analysis of the thermo-mechanical behaviour of powders during die compaction was performed using ABAQUS. The study considers heat from compression work and friction at particle-particle and die-wall interfaces. Results reveal that punch shape, compression speed, and die-wall friction significantly affect temperature and density distributions, with lower die-wall friction and speed reducing tablet temperature upon ejection.

个人简介(About the speaker):

Prof. Chuan-Yu (Charley) Wu, a Professor of Chemical Engineering at the University of Surrey, UK, has led two major European consortia—IPROCOM (FP7, 2013–2016, €3.8M) and MATHEGRAM (H2020, 2019–2023, €4.2M)—focusing on computational tools for pharmaceuticals and granular materials. He is an executive editor of Powder Technology, a leading journal in particle systems, and the founding Chief Editor for Frontiers in Chemical Engineering: Materials Process Engineering. He has co-authored the monograph Particle Technology and Engineering (Elsevier, 2016) and edited two influential books, Discrete Element Modelling of Particulate Media and Particulate Materials: Synthesis, Characterisation, Processing, and Modelling (RSC Publishing). Prof. Wu has published over 160 scientific papers and delivered more than 100 invited presentations globally. He serves on the advisory and editorial boards of esteemed journals, including Particuology, Acta Pharmaceutica Sinica B (APSB), and the Journal of Engineering.

His expertise lies in discrete element methods, finite element analysis, and simulations, particularly in pharmaceutical engineering, particle technology, and granular materials. For over two decades, Prof. Wu has collaborated with leading global companies to advance numerical modelling techniques for pharmaceutical and fine chemical manufacturing, with support from major pharmaceutical companies such as Pfizer, AstraZeneca, Genentech, Sanofi, Janssen, and MSD, as well as funding from the EPSRC and the EU.