TY - JOUR
T1 - Effective conductivity of composite materials made of randomly packed densified core-shell particles
AU - Chang, Chih Chun
AU - Chueh, Chih Che
N1 - Funding Information:
The research is made through the funding and support of the National Science and Technology Council (NSTC), Taiwan, under grant numbers: MOST 108-2218-E-006-028-MY3 and MOST 111-2221-E-006-102-MY3 . Any opinions, findings and conclusions for recommendations given in this article are those of the authors and do not necessarily reflect the viewpoints of the NSTC. The authors would like to extend their appreciation to Professor Antonio Bertei from the University of Pisa, Italy, for his insightful discussions, which greatly contributed to the development of this research.
Funding Information:
The research is made through the funding and support of the National Science and Technology Council (NSTC), Taiwan, under grant numbers: MOST 108-2218-E-006-028-MY3 and MOST 111-2221-E-006-102-MY3. Any opinions, findings and conclusions for recommendations given in this article are those of the authors and do not necessarily reflect the viewpoints of the NSTC. The authors would like to extend their appreciation to Professor Antonio Bertei from the University of Pisa, Italy, for his insightful discussions, which greatly contributed to the development of this research.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/10/1
Y1 - 2023/10/1
N2 - Three-dimensional microstructures of sintered core-shell spheres with various shell thicknesses and degrees of densification were numerically constructed using an available drop-and-roll algorithm with our newly developed core-shell generation as the post-processing step. An open-source software program was then used to obtain each microstructure's effective conductivity in terms of the core-shell features. The results obtained for the core-shell configuration were compared with existing models and available theoretical bounds, which showed underprediction at core-shell volume fractions φ=0.6–0.75 and overprediction when the core-shell volume fraction was larger than 0.85. Additionally, the conductive ring and straight line patterns associated with maximum intensity projection were clearly observed from axial and lateral views of the heat flux calculation, respectively. Both observed patterns were completely different than those traditionally made by solid grains, revealing inhomogeneity in the presence of core-shell structures. Such findings are expected to improve the understanding and methods used to design porous media with core-shell structures to serve as good heat exchangers or thermal insulators with high efficiency.
AB - Three-dimensional microstructures of sintered core-shell spheres with various shell thicknesses and degrees of densification were numerically constructed using an available drop-and-roll algorithm with our newly developed core-shell generation as the post-processing step. An open-source software program was then used to obtain each microstructure's effective conductivity in terms of the core-shell features. The results obtained for the core-shell configuration were compared with existing models and available theoretical bounds, which showed underprediction at core-shell volume fractions φ=0.6–0.75 and overprediction when the core-shell volume fraction was larger than 0.85. Additionally, the conductive ring and straight line patterns associated with maximum intensity projection were clearly observed from axial and lateral views of the heat flux calculation, respectively. Both observed patterns were completely different than those traditionally made by solid grains, revealing inhomogeneity in the presence of core-shell structures. Such findings are expected to improve the understanding and methods used to design porous media with core-shell structures to serve as good heat exchangers or thermal insulators with high efficiency.
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U2 - 10.1016/j.powtec.2023.118840
DO - 10.1016/j.powtec.2023.118840
M3 - Article
AN - SCOPUS:85166212882
SN - 0032-5910
VL - 428
JO - Powder Technology
JF - Powder Technology
M1 - 118840
ER -