Comparative study on natural convection melting in square cavity using lattice Boltzmann method
The phase change process is of significant importance in the application of phase change material (PCM). In this paper, the natural convection melting in a square cavity was investigated and the enthalpy-based lattice Boltzmann model (TLBM) combined with the pseudo-potential LB model was developed t...
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doaj-68f1a3216bc0437a93a3b4710dfa95df2020-11-25T03:42:18ZengElsevierResults in Physics2211-37972020-09-0118103274Comparative study on natural convection melting in square cavity using lattice Boltzmann methodZiliang Rui0Juan Li1Jie Ma2Han Cai3Binjian Nie4Hao Peng5Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing Tech University, No. 30 Pu Zhu South Road, Nanjing 211816, PR ChinaSchool of Mechanical and Electrical Engineering, Nanjing Forestry University, No. 159 Long Pan Road, Nanjing 210037, PR ChinaJiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing Tech University, No. 30 Pu Zhu South Road, Nanjing 211816, PR ChinaJiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing Tech University, No. 30 Pu Zhu South Road, Nanjing 211816, PR ChinaSchool of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UKJiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, School of Mechanical and Power Engineering, Nanjing Tech University, No. 30 Pu Zhu South Road, Nanjing 211816, PR China; Corresponding author.The phase change process is of significant importance in the application of phase change material (PCM). In this paper, the natural convection melting in a square cavity was investigated and the enthalpy-based lattice Boltzmann model (TLBM) combined with the pseudo-potential LB model was developed to trace the solid–liquid interface. Four cases with different boundary conditions were calculated and the corresponding temperature contours, velocity vectors and average liquid fraction at various time were compared.Results show that TLBM has good accuracy in simulating the solid-liquid phase transition process. Variation in boundary conditions has appreciable impact on the natural convection process and melting behavior. Comparing model.1 (single heating wall) with model.2 (double adjacent heating walls with cold wall), the maximum liquid fraction is increased 16.7% in model.2 and the additional top heating wall acts to accelerate the average melting rate by 16.7%. The comparison between model.3 (double opposite heating walls) and model.4 (double adjacent heating walls without cold wall) shows that the natural convection heat transfer is intensive in model.3 and resulting in a 280% faster melting rate than that in model.4. Comparing the melting rate between the model.5 (all heating walls) and model.3, the increase of 54% due to the more heating walls in model.5 is observed.http://www.sciencedirect.com/science/article/pii/S2211379720317411Natural convectionPhase change materialLattice BoltzmannLiquid fractionMelting behavior |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ziliang Rui Juan Li Jie Ma Han Cai Binjian Nie Hao Peng |
spellingShingle |
Ziliang Rui Juan Li Jie Ma Han Cai Binjian Nie Hao Peng Comparative study on natural convection melting in square cavity using lattice Boltzmann method Results in Physics Natural convection Phase change material Lattice Boltzmann Liquid fraction Melting behavior |
author_facet |
Ziliang Rui Juan Li Jie Ma Han Cai Binjian Nie Hao Peng |
author_sort |
Ziliang Rui |
title |
Comparative study on natural convection melting in square cavity using lattice Boltzmann method |
title_short |
Comparative study on natural convection melting in square cavity using lattice Boltzmann method |
title_full |
Comparative study on natural convection melting in square cavity using lattice Boltzmann method |
title_fullStr |
Comparative study on natural convection melting in square cavity using lattice Boltzmann method |
title_full_unstemmed |
Comparative study on natural convection melting in square cavity using lattice Boltzmann method |
title_sort |
comparative study on natural convection melting in square cavity using lattice boltzmann method |
publisher |
Elsevier |
series |
Results in Physics |
issn |
2211-3797 |
publishDate |
2020-09-01 |
description |
The phase change process is of significant importance in the application of phase change material (PCM). In this paper, the natural convection melting in a square cavity was investigated and the enthalpy-based lattice Boltzmann model (TLBM) combined with the pseudo-potential LB model was developed to trace the solid–liquid interface. Four cases with different boundary conditions were calculated and the corresponding temperature contours, velocity vectors and average liquid fraction at various time were compared.Results show that TLBM has good accuracy in simulating the solid-liquid phase transition process. Variation in boundary conditions has appreciable impact on the natural convection process and melting behavior. Comparing model.1 (single heating wall) with model.2 (double adjacent heating walls with cold wall), the maximum liquid fraction is increased 16.7% in model.2 and the additional top heating wall acts to accelerate the average melting rate by 16.7%. The comparison between model.3 (double opposite heating walls) and model.4 (double adjacent heating walls without cold wall) shows that the natural convection heat transfer is intensive in model.3 and resulting in a 280% faster melting rate than that in model.4. Comparing the melting rate between the model.5 (all heating walls) and model.3, the increase of 54% due to the more heating walls in model.5 is observed. |
topic |
Natural convection Phase change material Lattice Boltzmann Liquid fraction Melting behavior |
url |
http://www.sciencedirect.com/science/article/pii/S2211379720317411 |
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