Elucidation of Liquid‐Wall‐Slip Effect in Rotary Jet Spinning and the Formation Mechanism of Composite Fibers

As an innovative method for composite fiber fabrication, Rotary Jet Spinning (RJS) technology exhibits significant advantages over conventional electrospinning and melt spinning techniques in terms of equipment simplicity, material versatility, energy efficiency, and production throughput. Consequently, it has attracted considerable attention in the field of fiber material science in recent years. While existing studies predominantly focus on optimizing process parameters for controlling fiber morphology and exploring applications, systematic investigations into the rheological behavior of polymer solutions within fluid reservoir systems remain limited. This study utilizes a core‐shell structured RJS apparatus to conduct mechanical analysis of polymer solution dynamics, with particular emphasis on elucidating the kinematic principles governing dual‐spinning solutions in the reservoir. Finite element analysis (FEA) is employed to examine fluid flow patterns in both the reservoir and nozzle during RJS operation, complemented by experimental fabrication of composite fibers using the core‐shell spinning system. This research establishes a comprehensive framework that integrates theoretical modeling, computational fluid dynamics (CFD) simulations, and empirical validation. The comparative analysis confirms the validity of the proposed theoretical model, providing valuable insights for optimizing high‐performance composite fiber production.