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Lattice Boltzmann simulation of flow and heat transfer evolution inside encapsulated phase change materials due to natural convection melting

Journal Article


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Abstract


  • A comprehensive study of the melting process inside a capsule can potentially take full advantages of latent heat of phase change materials (PCMs). The present study was devoted to the problem of complex interaction of natural convection and melting of PCMs inside a spherical capsule under differen t sizes. The numerical results, simulated by lattice Boltzmann method (LBM), were compared with experimental data and published simulations. The results showed that LBM presented desirable accuracy compared to traditional computational fluid dynamics (CFD) methods. Then, the effects of non-uniform PCM properties, expressed by the solid/liquid thermal diffusivity ratio, on the melting rate were found to be nonlinear in different melting stages. The non-dimensional fully melting time reduced with the increase of the surface temperature and the capsule size, and the former compared to the latter could have a greater influence on the melting rate. Moreover, the non-dimensional fully melting time reduced when increasing of the capsule diameter at the macro-scale; while there was a near-invariable non-dimensional fully melting time when the capsule size was changed at the micro-scale. The good understanding of the phase change process inside the capsule would provide essential information to develop a multi-scale model of microencapsulated PCM slurries.

UOW Authors


  •   Lin, Qi (external author)
  •   Wang, Shugang (external author)
  •   Ma, Zhenjun
  •   Wang, Jihong (external author)
  •   Zhang, Tengfei (external author)

Publication Date


  • 2018

Citation


  • Lin, Q., Wang, S., Ma, Z., Wang, J. & Zhang, T. (2018). Lattice Boltzmann simulation of flow and heat transfer evolution inside encapsulated phase change materials due to natural convection melting. Chemical Engineering Science, 189 154-164.

Scopus Eid


  • 2-s2.0-85048005346

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2530&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1528

Number Of Pages


  • 10

Start Page


  • 154

End Page


  • 164

Volume


  • 189

Place Of Publication


  • United Kingdom

Abstract


  • A comprehensive study of the melting process inside a capsule can potentially take full advantages of latent heat of phase change materials (PCMs). The present study was devoted to the problem of complex interaction of natural convection and melting of PCMs inside a spherical capsule under differen t sizes. The numerical results, simulated by lattice Boltzmann method (LBM), were compared with experimental data and published simulations. The results showed that LBM presented desirable accuracy compared to traditional computational fluid dynamics (CFD) methods. Then, the effects of non-uniform PCM properties, expressed by the solid/liquid thermal diffusivity ratio, on the melting rate were found to be nonlinear in different melting stages. The non-dimensional fully melting time reduced with the increase of the surface temperature and the capsule size, and the former compared to the latter could have a greater influence on the melting rate. Moreover, the non-dimensional fully melting time reduced when increasing of the capsule diameter at the macro-scale; while there was a near-invariable non-dimensional fully melting time when the capsule size was changed at the micro-scale. The good understanding of the phase change process inside the capsule would provide essential information to develop a multi-scale model of microencapsulated PCM slurries.

UOW Authors


  •   Lin, Qi (external author)
  •   Wang, Shugang (external author)
  •   Ma, Zhenjun
  •   Wang, Jihong (external author)
  •   Zhang, Tengfei (external author)

Publication Date


  • 2018

Citation


  • Lin, Q., Wang, S., Ma, Z., Wang, J. & Zhang, T. (2018). Lattice Boltzmann simulation of flow and heat transfer evolution inside encapsulated phase change materials due to natural convection melting. Chemical Engineering Science, 189 154-164.

Scopus Eid


  • 2-s2.0-85048005346

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2530&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1528

Number Of Pages


  • 10

Start Page


  • 154

End Page


  • 164

Volume


  • 189

Place Of Publication


  • United Kingdom