[Oral Presentation]剪切诱导下致密颗粒流在非定常状态下的结构演变和流变性

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

剪切诱导下致密颗粒流在非定常状态下的结构演变和流变性

ID：50 Submission ID：148 View Protection：ATTENDEE Updated Time：2024-04-09 22:10:04 Hits：451 Oral Presentation

Start Time：Pending （Asia/Shanghai）

Duration：Pending

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

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Abstract

颗粒物质间的结构特性能够显著影响系统的流变性。研究了库艾特剪切诱导下的致密颗粒流的结构演变过程与流动特性并尝试建立两者的关系。在实验中，单分散的颗粒流产生结晶转变。在无序到有序的非定常流动中，颗粒流的速度响应与剪切应变率发生改变。在模拟中通过控制剪切间隙中颗粒的分散度来控制系统的结构势。当系统中的初始填料从高结构势向低结构势趋近时，流速的降低与应变率的增加被逐渐抑制。局部体积分数与相对位置关系表明这是由于有序导致的结构稀化效应减弱。这是特定剪切路径以及局部结构向更易转动的方式去演变造成的一种稀化效应。该路径降低了颗粒通过力链向内传递动量的能力。惯性数与粘度随体积分数的变化表明颗粒在非定常流动中的结构演化对最终的流动响应影响深远。颗粒流动性非单调曲线结果说明球形颗粒流在Φ=0.62发生流动性转变，结构稀化效应开始显著。

Keywords

颗粒流,结构演变,流变性

Speaker

剑白

东北大学

Submission Author

剑白东北大学

健李东北大学

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