Enthalpy-based multiple-relaxation-time lattice Boltzmann method for solid-liquid phase-change heat transfer in metal
Qing Liu1, Ya-Ling He1, Qing Li2
1Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
Physical Review. E
|September 28, 2017
Summary
A new enthalpy-based multiple-relaxation-time (MRT) lattice Boltzmann (LB) method accurately simulates solid-liquid phase-change heat transfer in metal foams. This efficient LB method avoids iterations for improved accuracy in latent heat storage applications.
Area of Science:
- Computational Fluid Dynamics
- Heat Transfer
- Materials Science
Background:
- Solid-liquid phase-change heat transfer is crucial for latent heat storage.
- Metal foams offer high surface areas for enhanced heat transfer.
- Local thermal nonequilibrium (LTNE) conditions are prevalent in porous media.
Purpose of the Study:
- To develop an enthalpy-based multiple-relaxation-time (MRT) lattice Boltzmann (LB) method for solid-liquid phase-change heat transfer in metal foams.
- To address the local thermal nonequilibrium (LTNE) condition.
- To provide an accurate and efficient numerical tool for latent heat storage applications.
Main Methods:
- Developed an enthalpy-based MRT-LB method comprising three MRT-LB models for flow, PCM temperature, and metal-foam temperature fields.
- Employed a generalized non-Darcy model for the flow field.
- Utilized an LTNE model for the temperature fields and implicitly tracked the phase interface via liquid fraction.
Main Results:
- The method avoids iteration, enhancing accuracy and computational efficiency compared to previous approaches.
- A volumetric LB scheme ensures accurate no-slip velocity conditions at the interface and in solid regions.
- The MRT collision model effectively reduces numerical diffusion across the phase interface.
Conclusions:
- The developed enthalpy-based MRT-LB method is a robust and efficient numerical tool for simulating phase-change heat transfer in metal foams.
- The method is suitable for studying metal-foam enhanced latent heat storage.
- The findings offer valuable insights for practical applications.
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