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Turbulence-induced fluctuating interfaces in heterogeneously active suspensions.

Siddhartha Mukherjee1, Kunal Kumar2, Samriddhi Sankar Ray2

  • 1Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India.

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Summary
This summary is machine-generated.

Spatially varying activity in dense bacterial suspensions creates hydrodynamic interfaces. These interfaces separate turbulent areas from jammed regions, offering control over active flows.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Biophysics

Background:

  • Dense bacterial suspensions exhibit complex active flows.
  • Spatially uniform activity is typically studied, limiting understanding of real-world scenarios.

Purpose of the Study:

  • To investigate the impact of heterogeneous (spatially varying) activity patterns on bacterial suspensions.
  • To explore the emergence of hydrodynamic interfaces and their properties.
  • To understand how heterogeneity influences mixing and flow control.

Main Methods:

  • Utilizing a hydrodynamical model for dense bacterial suspensions.
  • Implementing simple, quenched, spatially varying activity patterns.
  • Analyzing bacterial velocity fields, interface fluctuations, and Lagrangian tracer residence times.

Main Results:

  • Heterogeneous activity leads to hydrodynamic interfaces separating turbulent and jammed regions.
  • These interfaces exhibit intermittent and multiscale fluctuations.
  • Heterogeneity influences mixing dynamics and offers local control over active flows.

Conclusions:

  • Naturally occurring heterogeneities can significantly alter active flows, leading to complex configurations.
  • Hydrodynamic interfaces are a key emergent feature of heterogeneous active matter.
  • This research provides insights into controlling active flows through engineered heterogeneity.