Three-dimensional patterned surface for enhancing dropwise condensation

Abstract

The invention provides a three-dimensional patterned surface for enhancing dropwise condensation. The three-dimensional patterned surface comprises a super-hydrophobic substrate and an upper convex super-hydrophilic three-dimensional pattern, wherein the upper convex super-hydrophilic three-dimensional pattern comprises a plurality of upper convex super-hydrophilic three-dimensional structures anda droplet collection area, and the upper convex super-hydrophilic three-dimensional structures independently form an array distribution or the ends of the plurality of upper convex super-hydrophilicthree-dimensional structures are connected to form a cluster array distribution; the cross-sectional shape of the parallel surface of each upper convex super-hydrophilic three-dimensional structure iswedge-shaped; the cross-sectional shape of the vertical surface of each upper convex super-hydrophilic three-dimensional structure includes, but is not limited to, rectangular and inverted cones. According to the three-dimensional patterned surface, the transverse growth space of dropwise condensate liquid can be restrained, the size of the dropwise condensate liquid to be separated from a film-shaped area is remarkably reduced, and the transmission and convergence of the condensate liquid in the film-shaped area are promoted; and the cluster-like combination of a three-dimensional pattern can reduce the overall separation resistance of the surface condensate liquid, improve the dropwise condensation efficiency and long-acting property, and have important application value in the aspectsof high-efficiency water collection, condensation heat transfer and manufacturing of novel high-performance heat pipes.

Description

Technical field: [0001] The invention belongs to the technical field of condensation and heat and mass transfer, and in particular relates to a three-dimensional patterned surface for strengthening droplet condensation. Background technique: [0002] Condensation is a common phenomenon in nature and plays an important role in industrial production and life. It is widely used in microelectronics [Nature Reviews Materials, 2017, 2(2): 16092], energy [National Science Review, 2018, 5(6): 878–887], and aerospace industries. Condensation is divided into film condensation and drop condensation. Among them, the heat transfer efficiency of droplet condensation is several times that of film condensation [Journal of Power and Energy, 2002, 21:115-128], and the smaller the size of droplet condensation, the higher the condensation heat transfer efficiency [Applied Thermal Engineering, 2016, 98:1054-1060], but in the process of droplet condensation, as the condensation time increases, ...

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Problems solved by technology

However, the non-uniform wettability patterned surfaces currently used are all two-dimensional structures. Under the premise of a certain ratio between the drop-shaped area and the film-like area on the surface, it is difficult to further reduce the size of the condensate detachment in the drop-shaped area through pattern design. While the condensate in the droplet area is detached from the size, how to improve the long-term effectiveness of the condensate in the droplet area by increasing the convergence speed of the condensate in the film area and reducing the final separation resistance of the condensate after convergence is also a key problem to be solved

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