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April 8, 2026Journal of Fluid Mechanics

Interfacial stability in the swirling core–annular flow of two immiscible fluids

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Authors

HCHu ChenJZJ. F. Zhang

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Overview

This investigation reveals the dynamics of interfacial stability in two-fluid core–annular flow, suggesting new predictive controls for spiral modes.

Key Points

  • The research aims to explore the physical mechanisms that affect interfacial stability in core–annular flow of two immiscible fluids.
  • Investigated the effects of gravity, interfacial tension, and shear stresses on interface stability.
  • Examined the impact of varying axial velocities on spiral mode initiation.
  • Conducted an energy budget analysis to distinguish mechanisms of instability.
  • Identified the emergence of spiral modes influenced by azimuthal shear and centrifugal acceleration.
  • Found that higher Reynolds numbers in the annular fluid lead to more complex spiral modes.
  • Demonstrated that reduced annular thickness suppresses higher azimuthal wavenumber growth.

Cite This Study

Chen et al. (2026) studied this question.

synapsesocial.com/papers/69d5f0ee74eaea4b11a7a63ahttps://doi.org/10.1017/jfm.2026.11185
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