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Thermal conductivity of aluminum foam based on 3‐D stochastic sphere model
Author(s) -
Sun Minghan,
Fan Meichen,
Li Lingxiao,
Xu Zhiqiang,
Yang Tingsong
Publication year - 2020
Publication title -
heat transfer
Language(s) - English
Resource type - Journals
eISSN - 2688-4542
pISSN - 2688-4534
DOI - 10.1002/htj.21640
Subject(s) - thermal conductivity , porosity , materials science , thermal conduction , metal foam , aluminium , composite material , thermal , porous medium , conductivity , thermodynamics , chemistry , physics
To accurately characterize the geometric structure of closed‐cell aluminum foam, a three‐dimensional stochastic sphere model with adjustable porosity and pore size was established, and its thermal conductivity was studied by numerical simulation. A closed‐cell aluminum foam heat conduction experiment was designed to verify the accuracy of the model. Using this model, the thermal conductivity of aluminum foam with different pore sizes and porosity was calculated, and the variation of thermal conductivity was studied. The results show that with the same porosity, the thermal conductivity increases linearly with the pore size. With the same pore size, the thermal conductivity decreases linearly with the porosity. The equivalent thermal conductivity decreases with the increase of porosity. According to the simulation results, the formula of equivalent thermal conductivity of aluminum foam is λ d = − 0.1548 θ + 14.2236 .