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Liquid-liquid Extraction and York-Scheibel Column Operation
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Efficient lattice Boltzmann method for electrohydrodynamic solid-liquid phase change.

Kang Luo1,2, Alberto T Pérez3, Jian Wu1,2

  • 1School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China.

Physical Review. E
|September 11, 2019
PubMed
Summary
This summary is machine-generated.

Electrohydrodynamic (EHD) flow significantly accelerates melting in dielectric phase change materials. This study demonstrates that electric fields can reduce melting time by up to 50%, offering potential for enhanced thermal management.

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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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Area of Science:

  • Multiphysics simulation
  • Phase change material (PCM) heat transfer
  • Electrohydrodynamics (EHD)

Background:

  • Melting processes in phase change materials are crucial for thermal energy storage and management.
  • External fields, such as electric fields, can influence phase change dynamics.
  • Understanding electrohydrodynamic effects on melting is essential for optimizing PCM applications.

Purpose of the Study:

  • To numerically investigate melting in dielectric phase change materials under electrohydrodynamic (EHD) flow.
  • To develop and validate a unified lattice Boltzmann model (LBM) for coupled solid-liquid phase change and EHD.
  • To systematically analyze the influence of key dimensionless parameters on melting behavior.

Main Methods:

  • Development of a unified lattice Boltzmann model (LBM) to solve coupled mechanical, electrical, energy, and continuity equations.
  • Validation of the numerical model against analytical solutions in hydrostatic conditions.
  • Systematic investigation of the effects of electric Rayleigh number (T), Prandtl number (Pr), and Stefan number (St).

Main Results:

  • The LBM code accurately reproduces melting phenomena, including charge density and electric field discontinuities at the interface.
  • Four distinct flow stages and three types of flow instabilities were observed during the melting process.
  • Significant influence of the electric field on melting was found, particularly at high T and Pr, and low St.

Conclusions:

  • Electrohydrodynamic flow driven by Coulomb forces can substantially enhance the melting rate of dielectric phase change materials.
  • The electric field's impact is most pronounced under specific parameter regimes, offering a tunable mechanism for melting control.
  • A maximum reduction in melting time of approximately 50% was achieved, highlighting the potential of EHD for efficient thermal management.