Effective　thermal　management　is　essential　for　guaranteeing　the　working　efficiency　and　safety　of　several　industrial　devices.　Due　to　its　excellent　heat　absorption　characteristic,　microencapsulated　phase　change　material　(MEPCM)　is　promising　for　thermal　management　system.　However,　the　drawback　of　MEPCM＇s　low　thermal　conductivity　seriously　hinders　the　heat　dissipation　rate　from　heat　sink.　Based　on　their　high　thermal　conductivity　and　effective　interconnected　anisotropic　heat　transfer　channels,　metal　fibers　could　be　inserted　into　MEPCM　to　ameliorate　its　corresponding　heat　transfer　capability.　In　the　current　work,　novel　stacked　2D　metal　fibers　are　designed　and　coupled　with　MEPCM　in　order　to　improve　the　thermal　performance　of　heat　sink.　Based　on　the　numerically　reconstructed　metal　fibers,　the　thermal　performance　of　heat　sink　assembly　filled　with　MEPCM-metal　fiber　composite　is　investigated　through　pore-scale　lattice　Boltzmann　modelling.　When　the　latent　heat　of　MEPCM　is　available,　the　heat　sink　assembly　using　anisotropic　stacked　2D　metal　fibers　has　a　less　temperature　rise　compared　with　that　using　random　metal　fibers　because　of　the　consolidated　heat　transfer　rate　in　a　desired　vertical　direction.　Furthermore,　for　an　intermittent　working　heat　sink,　the　MEPCM-stacked　2D　metal　fiber　composite　with　high　anisotropic　degree　exhibits　more　obvious　advantage　on　its　thermal　management　owing　to　the　periodically　recharged　latent　heat　for　further　heat　absorption.　©　2020　Elsevier　Masson　SAS