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Auto-ejection of liquid from a nozzle.

Fang Shan1, Zhenhua Chai1,2,3, Baochang Shi1,2,3

  • 1School of Mathematics and Statistics, Huazhong University of Science and Technology, Wuhan 430074, China.

Physical Review. E
|May 17, 2024
PubMed
Summary
This summary is machine-generated.

This study develops a theoretical model and a lattice Boltzmann method to simulate liquid auto-ejection from nozzles. The findings offer insights into droplet formation and aid in designing droplet ejectors.

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Area of Science:

  • Fluid dynamics
  • Computational physics
  • Microfluidics

Background:

  • Auto-ejection of liquid is a complex phenomenon crucial for engineering applications.
  • It involves intricate processes like interface movement, deformation, and jet breakup.

Purpose of the Study:

  • To derive a theoretical velocity for meniscus at nozzle exit to analyze auto-ejection critical conditions.
  • To propose and validate a lattice Boltzmann (LB) method for simulating liquid jet auto-ejection.
  • To investigate the influence of various parameters on the auto-ejection process.

Main Methods:

  • Theoretical derivation of meniscus velocity at nozzle exit.
  • Development and application of a consistent and conservative axisymmetric lattice Boltzmann (LB) method.
  • Numerical simulations to validate the LB model against theoretical and experimental data.

Main Results:

  • The proposed LB model shows good agreement with theoretical and experimental results.
  • Distinct phenomena such as meniscus deformation, capillary necking, and droplet pinch-off were observed.
  • The study analyzed the effects of contraction ratio, length ratio, contact angle, and nozzle structure.

Conclusions:

  • The developed LB method accurately simulates liquid auto-ejection processes.
  • The findings provide valuable insights into droplet jetting dynamics.
  • Results can guide the design of droplet ejectors and enhance understanding of microgravity jetting.