In　this　study,　we　employed　both　experimental　and　simulated　methods　to　investigate　the　capillary　flow　phenomenon　in　composite　wicks　that　integrate　the　silicon-based　microchannels　with　AAO　nanoporous　membranes.　The　experiment　utilized　deionized　water　and　anhydrous　ethanol　to　analyze　the　capillary　performance　of　both　the　microchannel　wick　and　the　microchannel　nanoporous　membrane　composite　wick.　The　findings　demonstrated　that　the　micro-nano　composite　wick　exhibited　a　higher　capillary　rise　height　and　a　faster　capillary　rise　rate　compared　to　the　microchannel　wick.　The　optimal　capillary　rise　heights　for　deionized　water　and　anhydrous　ethanol　were　associated　with　microchannel　widths　of　10　μm　and　20　μm,　respectively.　Additionally,　the　parameter　K/Reff　was　used　to　evaluate　the　capillary　performance　of　both　the　microchannel　wick　and　the　micro-nano　composite　wick.　The　optimal　capillary　performance　parameters　for　deionized　water　and　anhydrous　ethanol　are　6.80　×　10−8　m　and　5.54　×　10−7　m,　respectively.　Subsequently,　the　capillary　flow　characteristics　of　the　micro-nano　composite　wick　were　further　investigated　using　the　lattice　Boltzmann　method.　The　results　indicate　that　when　the　working　fluid　passes　through　the　nanopores,　it　becomes　immersed　within　their　interiors,　thereby　continuously　propelling　the　working　fluid　forward.　Concurrently,　the　radius　of　curvature　at　the　liquid　front　decreases,　further　enhancing　capillary　performance.　©　2025　Elsevier　Ltd