Applied Mathematics and Mechanics (English Edition) ›› 2024, Vol. 45 ›› Issue (12): 2203-2214.doi: https://doi.org/10.1007/s10483-024-3193-8

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An upper bound on the steady flow velocity of solvent-free nanofluids

Weipeng HU1,2,*(), Zhengqi HAN1, Xiqiao FENG3, Yaping ZHENG4, Zichen DENG4   

  1. 1 School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China
    2 State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, China
    3 Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
    4 School of Science, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2024-07-02 Online:2024-12-01 Published:2024-11-30
  • Contact: Weipeng HU E-mail:wphu@nwpu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(12172281);the Fund of the Science and Technology Innovation Team of Shaanxi Province of China(2022TD-61);the Open Project of State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University(HJGZ2023102);the Shaanxi Province Key Research and Development Project(2024SFYBXM-531);Project supported by the National Natural Science Foundation of China (No. 12172281), the Fund of the Science and Technology Innovation Team of Shaanxi Province of China (No. 2022TD-61), the Open Project of State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University (No. HJGZ2023102), and the Shaanxi Province Key Research and Development Project (No. 2024SFYBXM-531)

Abstract:

The rheological properties and limited flow velocities of solvent-free nanofluids are crucial for their technologically significant applications. In particular, the flow in a solvent-free nanofluid system is steady only when the flow velocity is lower than a critical value. In this paper, we establish a rigid-flexible dynamic model to investigate the existence of the upper bound on the steady flow velocities for three solvent-free nanofluid systems. Then, the effects of the structural parameters on the upper bound on the steady flow velocities are examined with the proposed structure-preserving method. It is found that each of these solvent-free nanofluid systems has an upper bound on the steady flow velocity, which exhibits distinct dependence on their structural parameters, such as the graft density of branch chains and the size of the cores. In addition, among the three types of solvent-free nanofluids, the magnetic solvent-free nanofluid poses the largest upper bound on the steady flow velocity, demonstrating that it is a better choice when a large flow velocity is required in real applications.

Key words: solvent-free nanofluid, structure-preserving method, flexible hub-beam model, steady flow velocity

2010 MSC Number: 

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