2026/04/30 by Anonymous, Satoi Suzuki, Toshiyuki Sanada
Engineering · Materials Science · Physics and Astronomy · #Fluid Dynamics and Mixing #Fluid Dynamics and Thin Films #Ultrasound and Cavitation Phenomena #physics.flu-dyn
paper · pdf · doi:10.1103/6rn3-tp8q
published as Phys. Rev. Fluids 11, 073604 (2026)
openalex publication_date 2026/07/07 · arxiv created 2026/07/08 · openalex created_date 2026/07/08 · arxiv updated 2026/07/31 · openalex updated_date 2026/07/31
Wake-induced lift is a key mechanism governing the initial destabilization of bubbles rising in a chain (Atasi et al., 2023). Moore's wake model predicts limited interfacial vorticity and a relatively slender, spatially confined wake for clean spherical bubbles, suggesting that wake-mediated interactions weaken as the inter-bubble spacing increases. However, we observed pronounced large-scale lateral dispersion and strong bubble frequency dependence in controlled experiments where bubble diameter and generation frequency were independently varied, even when the inter-bubble separation exceed the characteristic wake length. A reduced-order model incorporating pairwise wake-induced interactions captured the onset of bubble chain destabilization but systematically underpredicted the subsequent emergence of large-scale dispersion. We demonstrate that bubbles rising in a chain collectively generate a mean upward liquid flow that modifies the local shear field, enhancing the lateral migration through shear-induced lift. Incorporating this self-induced weak flow into the model quantitatively reproduced both the dispersion magnitude and its frequency dependence. These results suggest that the dispersion of bubbles rising in a chain involves a two-stage mechanism, with initial chain destabilization mediated by wake interactions, followed by flow modification arising from two-way coupling between bubbles and the liquid. This collective mechanism highlights the importance of self-induced mean flow effects in continuum descriptions of bubble flows.