Euler-Lagrangian modeling of multifilament with phase change: Dynamics, stability, and safety analysis

•Simulation of the multifilament spinning process with a modified Eulerian-Lagrange model.•Two dynamically unstable regions and one DMAC accumulation zone are quantitatively identified.•The hydrodynamic stability of spinning is intricately linked to the lateral and inversed stream.•The thermal stabi...

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Bibliographic Details
Published inChemical engineering science Vol. 295; p. 120145
Main Authors Li, Shi-Jiao, Zhang, Xi-Bao, Luo, Zheng-Hong
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 05.08.2024
Subjects
Dry spinning
Euler-Lagrangian model
Fiber stability
Multiphase flow
Solvent accumulation
Dry spinning
Multiphase flow
Euler-Lagrangian model
Solvent accumulation
Fiber stability
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Summary:•Simulation of the multifilament spinning process with a modified Eulerian-Lagrange model.•Two dynamically unstable regions and one DMAC accumulation zone are quantitatively identified.•The hydrodynamic stability of spinning is intricately linked to the lateral and inversed stream.•The thermal stability of spinning can be efficiently regulated by the inlet air temperature.•The spinning safety can be efficiently regulated by the inlet DMAC fraction. The industrial multifilament spinning unit is plagued by intricate multiphase and multiscale interactions that remain insufficiently comprehended. A modified Euler-Lagrangian method is employed to scrutinize its dynamic field, taking the dry spinning of spandex as an illustrative case. This framework is first validated by industrial-obtained fiber behaviors. Thereafter, the interaction between 80 filaments and the surrounding airflow is comprehensively explored. Finally, two dynamically unstable regions at the channel upper and bottom sections, along with a solvent accumulation zone near outlet1 are quantitatively identified. The pivotal role of lateral and inverse streams in their formation is revealed. In addition, this work demonstrates an increase in hydrodynamic instability under elevated inlet velocities and outlet pressure conditions, and the efficient regulation of thermal and safety aspects by manipulating inlet air temperature and the dimethylacetamide fraction. The present study indicates that the Euler-Lagrangian model is a powerful tool for deeply exploring and optimizing the multifilament system.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2024.120145