3-D printing 3D printing 3D printing lattice channel 3D-printing 3d printing lattice channel Alumina Aluminum oxide Convective heat transfer Drops Experimental test Heat convection Heat transfer and pressure drop Heat transfer co-efficients Heat transfer coefficients Nanofluidics Nanofluids Nanoparticles Periodic cellular materials Pressure drop Pressure drop measurements Suspensions (fluids) Thermodynamic properties additive manufacturing convective heat transfer nanofluids periodic cellular material