Multiplex vortex instability in the flow of non-Newtonian fluids through microcavity arrays

• DOI: 10.1063/5.0201542
• Publication Date: 2024-04-01T10:54:07Z
• Authors: Xiao-Yu Xu; Zhou-Yi Zheng; Kai Tian; Dong Wang; Kai-Rong Qin; Chun-Dong Xue
• Keywords: Multiplex

Complex fluids always possess obvious non-Newtonian properties that facilitate the occurrence and development of vortex instability in porous media, which is critical significance many natural industrial processes. It widely known this flow regulated by both fluid solid structure. However, quantitative understanding how structural characteristics space affect evolution still nascent, especially case with varying rheological properties. Herein, polymer solutions distinct through microcavity arrays experimentally studied, we systematically explore effect parameters cavity array on instability. We find that, for Newtonian shear-thinning negligible elasticity, behavior each identical to those an isolated cavity. In contrast, viscoelastic fluids, visibly affected number cavity–cavity interval, exhibits different forms when participates or not. Multiplex instabilities are observed under these tested conditions. By multiplex, mean formation dynamics patterns diversified. These unusual phenomena then interpreted terms interplay between elongation relaxation polymers as they navigate among neighboring cavities. results can help us further understand complex media evoke new strategies microfluidic applications efficient mixing.