IMPACT OF ANISOTROPY ON GEOMETRICAL AND THERMAL CONDUCTIVITY OF METALLIC FOAM STRUCTURES

摘要: The thermo-physical properties of open cell metal foams depend on their microscopic structure. Various virtual ideal periodic isotropic foam samples having circular, square, hexagon, diamond, and star strut cross sections with various orientations are realized in the porosity range from 60 to 95%. anisotropy original sample is then by elongating one direction a factor Omega, while 1/root Omega applied along two perpendicular directions conserve sample. A generalized analytical model geometrical parameters has been proposed all results fully compared measured data. Three-dimensional heat conduction numerical simulations at pore scale have performed, which allow determining macroscale physical properties, such as effective thermal conductivity, using volume averaging technique. Two models derived simultaneously order predict intrinsic solid phase conductivity (lambda(s)) (lambda(eff)). modified correlation term (F) introduced resistor take into account conductivities constituent phases Lemlich derived. data excellent agreement observed.