Experimental investigation of pool boiling heat transfer of copper porous structures fabricated via 3 D printing
SLM(selective laser melting)technology was employed to fabricate copper porous structure samples,and deionized water was used as the working fluid.The effects of SLM process parameters and porous structure configurations on capillary performance and pool boiling heat transfer characteristics of the fabricated samples were investigated.The results show that increasing the laser scan spacing significantly enhances the capillary rise speed and maximum capillary rise height within the porous structure.Compared with samples prepared by smaller scan spacing parameters,the maximum capillary rise height of samples produced with larger scan spacing increases by approximately 29.6%.Additionally,with the augmentation of scan spacing,the critical heat flux FCH and heat transfer coefficient CHT of samples with larger scan spacing both increase.When compared to smooth surfaces,samples with pillar and lattice structures demonstrate notable improvements in FCH and CHT.Particularly,the pillar structure exhibites superior heat transfer performance,with FCH and CHT increasing to 233.5 W/cm2 and 12 W/(cm2·K),respectively,marking enhancements of 103%and 106.9%.These enhancements can be attributed to the higher density of nucleation sites within the skeletal framework of the pillar structure,which also effectively improves gas-liquid flow and promotes liquid reflux.
3D printingporous structurespool boilingcapillary performanceprocess parameters
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