[Oral Presentation]张昭-电场作用下颗粒介质从密集颗粒流到稀疏颗粒流的相变机制

Organized By

Hohai University

Monash University

Co-organized by

Southeast University

Jiangxi University of Science and Technology

Northeast University

DUT-BSU Scientific Research and Innovation Center

Suzhou University of Science and Technology

State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment

Sponsoring agency

KELI SDEM Software (Dalian) Co., Ltd.

Sugon Smart Computing Information Technology Co., Ltd.

Beijing Paratera Technology Co., Ltd.

Simpop Information Technology Co., Ltd.

Important Dates

Conference Announcement

December 2023, release First Round Announcement
Abstract Submission Deadline
March 31^th, 2024
Paper Submission Deadline
April 30^th, 2024
Registration
From January 1^st, 2024
Conference Schedule
May 31^st (Friday), 2024 On-Site Registration
June 1^st to 3^rd, 2024 Conference

张昭-电场作用下颗粒介质从密集颗粒流到稀疏颗粒流的相变机制

ID：309 Submission ID：119 View Protection：ATTENDEE Updated Time：2024-05-20 09:59:46 Hits：499 Oral Presentation

Start Time：Pending （Asia/Shanghai）

Duration：Pending

Session：[No Session] » [No Session Block]

Presentation File

Tips: The file permissions under this presentation are only for participants. You have not logged in yet and cannot view it temporarily.

Abstract

颗粒带电使得密集颗粒介质发生流动、溅起，引起风沙运动或影响空间探测任务的开展。由于颗粒之间的碰撞和摩擦产生极化电荷，使得颗粒介质在电场作用下从密集颗粒流向稀疏流转变，其相变机理仍不明确。本文基于离散单元法，考虑表面具有不均匀电荷的颗粒在接触碰撞过程中的极化、中和特征，研究不同层厚的密集颗粒床面在受到底部激励以及外电场作用下的相变过程，通过均方位移和接触数提出由密集准静态到密集流态的一阶相变以及由密集流态到稀疏态的二阶相变的临界相图。其次，根据扩散系数的基本物理定义，建立在不同外加电场情形下，极化强度和电荷的非稳态扩散方程组，结合底部激励向上传递中的耗散和扩散特征，提出一阶和二阶相变的临界电场、底部激励速度以及层厚之间的理论表征。最后基于数值和理论提出的相变模型对静电除尘效率进行了预测，表明文中建立模型的准确性，为航天探测的安全着陆，静电除尘定量预测奠定理论基础。

Keywords

带电颗粒，极化，相变，物理特性，除尘效率

Speaker

张昭

兰州大学

Submission Author

张昭兰州大学

叶晓燕兰州大学

Sponsored By

Hohai University

Panel of Computational Mechanics on Granular Materials, Working Party of Computational Mechanics, Chinese Society of Theoretical and Applied Mechanics

Jiangsu Society of Theoretical and Applied Mechanics