Estimation of effective thermal conductivity in open-cell foam with hierarchical pore structure using lattice Boltzmann method. (5th January 2023)

• Record Type: Journal Article
• Authors: Lin, Yixiong; Yang, Chen; Zhang, Wei; Fukumoto, Kazui; Saito, Yasuhiro; Machida, Hiroshi; Norinaga, Koyo
• Is Part Of: Applied thermal engineering. Volume 218(2022)
• Publication Date: 2023-01-05
• Subjects: Open-cell foam -- Hierarchical pore structure -- Effective thermal conductivity (ETC) -- Heat radiation -- Lattice Boltzmann method; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2022.119314
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Hierarchical pore structure is built in open-cell foam by an artificial algorithm. Effective thermal conductivity (ETC) was calculated by lattice Boltzmann method. Effects of hierarchical pore structure on ETC were investigated. ETC correlation for open-cell foam with hierarchical pore structure is derived. Abstract: Effective thermal conductivity in open-cell foam with hierarchical pore structure was estimated using lattice Boltzmann method. A new structure algorithm was proposed to reconstruct hierarchical pore structure in open-cell foam. In order to elucidate the heat transfer characteristics in hierarchical pore structure, the effect of structure parameters, namely the hierarchical pore size ratio ( d 2 / d 1 ), the hierarchical pore volume ratio ( V 2 / V 1 ), and temperature on the effective thermal conductivity was investigated. These results indicated that hierarchical pore structure is unfavorable to the effective thermal conductivity in open-cell foam for the heat conduction process. At high temperatures ( T ave = 450–1650 K ), however, the effective thermal conductivity in hierarchical pore structure is higher than that in uniform pore structure considering heat radiation. Furthermore, for the heat conduction process, a correlation of the effective thermal conductivity related to open-cell foam with hierarchical pore structure was proposed and validated by available experimental data.