Applied Mathematics and Mechanics (English Edition) ›› 2016, Vol. 37 ›› Issue (1): 59-74.doi: https://doi.org/10.1007/s10483-016-2016-9

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Finite depth Stokes' first problem of thixotropic fluid

Wenwen LIU, Jie PENG, Keqin ZHU   

  1. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
  • 收稿日期:2015-03-12 修回日期:2015-06-15 出版日期:2016-01-01 发布日期:2016-01-01
  • 通讯作者: Jie PENG E-mail:peng-jie@mail.tsinghua.edu.cn

Finite depth Stokes' first problem of thixotropic fluid

Wenwen LIU, Jie PENG, Keqin ZHU   

  1. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
  • Received:2015-03-12 Revised:2015-06-15 Online:2016-01-01 Published:2016-01-01
  • Contact: Jie PENG E-mail:peng-jie@mail.tsinghua.edu.cn

摘要:

This paper presents a study of the finite depth Stokes' first problem for a thixotropic layer. The yield behavior of the thixotropic fluid in this problem is investigated for the first time. The main physical features of this problem are discussed, including the flow field, the wall stress, and the depth of the yield region. It is shown that the yield region appears near the wall, and the yield surface moves from the wall into the flow region and moves back to the wall finally. In contrast to the solution of the Newtonian fluid, the velocity of the thixotropic layer generally does not increase with time monotonously during the start-up process. The classical solution of the Newtonian fluid can be recovered from our results in extreme cases.

关键词: Stokes' first problem, yield, thixotropy

Abstract:

This paper presents a study of the finite depth Stokes' first problem for a thixotropic layer. The yield behavior of the thixotropic fluid in this problem is investigated for the first time. The main physical features of this problem are discussed, including the flow field, the wall stress, and the depth of the yield region. It is shown that the yield region appears near the wall, and the yield surface moves from the wall into the flow region and moves back to the wall finally. In contrast to the solution of the Newtonian fluid, the velocity of the thixotropic layer generally does not increase with time monotonously during the start-up process. The classical solution of the Newtonian fluid can be recovered from our results in extreme cases.

Key words: thixotropy, yield, Stokes' first problem

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