哈尔滨工业大学（深圳）学术讲座

演讲人Speaker：Prof. Dr. Alan Jeffrey GIACOMIN

题目Title 1: The New Physics of Fluids

题目Title 2: Recent Advances In Polymer Viscoelasticity From General Rigid Bead-Rod Theory

时间Date：2024年 7月 9日       Time：上午9:00~12:00

地点Venue： H 栋 308  室  

内容摘要Abstract：

One good way to explain the elasticity of a polymeric liquid, is to just consider the orientation distribution of the macromolecules. When exploring how macromolecular architecture affects the elasticity of a polymeric liquid, we find general rigid bead-rod theory to be both versatile and accurate. This theory sculpts macromolecules using beads and rods. Whereas beads represent points of Stokes flow resistances, the rods represent rigid separations. In this way, how the shape of the macromolecule affects its rheological behavior in suspension is determined. Our work shows the recent advances in polymer viscoelasticity using general rigid bead-rod theory, including the discovery of the first new materials functions from general bead-rod theory since the first, the complex viscosity of Hassager (1974). These include the steady shear material functions, large-amplitude oscillatory shear flow material functions, and the steady uniaxial, biaxial and planar extensional viscosities. We find each of these material functions to depend upon the same molecular feature: the ratio of the macromolecular moment of inertia about the molecular axis to that about the axes transverse to the molecular axis. We then use these new material functions to bridge the Oldroyd 8-constant framework (and thus all of its many special cases) to general bead-rod theory.

Keywords: Rotational diffusivity; general rigid bead-rod model; complex viscosity; viscoelasticity; orientation.

个人简介(About the speaker):

Giacomin（杰克明） 教授是加拿大金斯顿皇后大学（Queen's University in Kingston, Ontario）化学工程、机械和材料工程和物理学、工程物理学和天文学的教授（已退休），同时也是加拿大一级流体物理学研究主席，美国内华达大学里诺分校（University of Nevada, Reno）的兼职教授。

Giacomin 教授出生于金斯顿，毕业于蒙特利尔岛高中。于金斯顿皇后大学Queen's University in Kingston获得化学工程学士和硕士学位，后就职于杜邦加拿大（DuPont Canada）的研发部门。他在麦吉尔大学（McGill University）师从 John Dealy 教授获得化学工程博士学位，论文题目为“带有剪切应力传感器的滑板熔体流变仪，A Sliding Plate Melt Rheometer Incorporating a Shear Stress Transducer”。之后任职于德克萨斯农工大学（Texas A&M University）机械工程系。Giacomin 教授还曾担任威斯康星大学（University of Wisconsin-Madison）机械工程教授，并在该大学担任流变学研究中心主任长达二十年。此外，他还担任麦吉尔大学（McGill University）、舍布鲁克大学（the University of Sherbrooke）、瑞士联邦理工学院（the Swiss Federal Institute of Technology）、巴黎矿业学院（the Paris School of Mines）、新加坡国立大学（the National University of Singapore）、台北中原大学（Chung Yuan University near Taipei）、台湾云林大学（Yunlin University, in southern Taiwan）和山东大学（Shandong University）的客座教授。