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Investigating Cell-Induced Mixing Dynamics in Microfluidic Droplets Using the Lattice Boltzmann Method
Kamal Jannati1, Mohammad-Hassan Rahimian2, Mehrdad Raisee3
1CNNFM Lab, School of Mechanical Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563 Tehran, Iran.
Langmuir : the ACS Journal of Surfaces and Colloids
|January 17, 2025
Summary
Cell deformability significantly impacts mixing efficiency in microfluidic droplets. Moderate cell deformability enhances mixing by inducing flow asymmetry, crucial for applications in diagnostics and synthesis.
Area of Science:
- Fluid dynamics
- Biophysics
- Microfluidics
Background:
- Microfluidic devices offer precise control over fluid behavior.
- Efficient mixing is critical for various applications, including chemical synthesis and biomedical diagnostics.
- Understanding cell dynamics within droplets is key to optimizing microfluidic processes.
Purpose of the Study:
- To investigate how cell dynamics, including motion and deformability, affect mixing efficiency in microfluidic droplets.
- To quantify the relationship between cell-induced flow asymmetry and mixing enhancement.
- To identify optimal cell properties for maximizing mixing in microfluidic systems.
Main Methods:
- Numerical simulations of droplets containing encapsulated cells.
- Varying Peclet numbers (Pe = 100-800) and coupling constants (k = 0.0025, 0.005, 0.0075).
- Analysis of velocity and concentration fields using mixing and asymmetry indices.
Main Results:
- Encapsulated cells significantly enhance mixing, especially at high Peclet numbers.
- Cell-induced disturbances in velocity fields disrupt symmetrical flow, improving mixing.
- Moderate cell deformability leads to increased off-center movement, chaotic flow, and enhanced mixing.
Conclusions:
- Optimal microfluidic droplet mixing is achieved with moderately deformable cells.
- Cell deformability influences flow field asymmetry and convective transport.
- Findings provide insights for designing microfluidic systems for precise mixing control.
