Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes.

ABSTRACT: Phase-change condensation is commonplace in nature and industry. Since the 1930s, it is well understood that vapor condenses in filmwise mode on clean metallic surfaces whereas it condenses by forming discrete droplets on surfaces coated with a promoter material. In both filmwise and dropwise modes, the condensate is removed when gravity overcomes pinning forces. In this work, we show rapid condensate transport through cracks that formed due to material shrinkage when a copper tube is coated with silica inverse opal structures. Importantly, the high hydraulic conductivity of the cracks promote axial condensate transport that is beneficial for condensation heat transfer. In our experiments, the cracks improved the heat transfer coefficient from ≈ 12 kW/m² K for laminar filmwise c

SUBMITTER: Adera S 

PROVIDER: S-EPMC8140112 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature