Heat transfer enhancement at evaporation and boiling of liquid on capillary-porous surfaces created by 3D printing

Abstract The paper presents the results of experiments on measuring heat transfer in laminar-wave films R114/R21 refrigerant mixture flowing down a vertical plate (70 × 80 mm). were carried out saturation line at pressure 2 bar. To enhance transfer, porous copper coating with flat layer thickness 400 μm and porosity 45% was applied to heat-transfer surface by 3D printing. effectiveness application technique used for enhancement is demonstrated: an increase boiling coefficient obtained up three times comparison reference smooth surface, as well two-fold evaporation regime. Based experimental analysis research data other authors, geometric structure promising multiscale enhancing proposed further research.