Abstract
The research of marine antifouling is mainly conducted from the aspects of chemistry, physics, and biology. In the present work, the movement model of microorganisms along or against the flow direction on the microstructural surface was established. The model of globose algae with a diameter of 5 μm in the near-wall area was simulated by computational fluid dynamics (CFD), and the fluid kinematic characteristics and shear stress distribution over different-sized microstructures and in micropits were compared. Simulation results revealed that the increase of the β value (height to width ratio) was prone to cause vortexes in micropits. In addition, the closer the low-velocity region of the vortex center to the microstructural surface, the more easily the upper fluid of the microstructure slipped in the vortex flow and reduced the microbial attachment. Moreover, the shear stress in the micropit with a height and width of 2 μm was significantly higher than those in others; thus, microbes in this micropit easily fell off.
Highlights
Antifouling technology is beneficial for energy, marine, and other industries
The experimental results showed that the samples with 20–80 μm had Energies 2020, 13, 4421 higher adhesion rate (48–75%), and microorganisms tended to adhere to structures larger than their own size
The mesh inner was surfaces of simulate the channels were in no-slip condition for wall–liquid boundary, dynamic used to the movement of microorganisms on the microstructural surface
Summary
Antifouling technology is beneficial for energy, marine, and other industries. The maintenance of power plant equipment, the development and utilization of new energies [1,2], and ship protection [3,4]. 1. The four types of surfaces have different roughness and microstructures, and that made Ulva spores. Designed a ribbed shell surface with sixwith types cylindrical protrusions of different sizes andsizes spacings. The experimental results showed that the samples with 20–80 μm had Energies 2020, 13, 4421 higher adhesion rate (48–75%), and microorganisms tended to adhere to structures larger than their own size. For suspended particles was formed near the surface of the microstructure membrane, prismatic stripe patterns and compared the deposition of particles on these structures under different reducing numbers the deposition of particles. CFD the wasmicrostructure, applied to simulate the to movement of microorganisms the studied the groove and convex surface with different sizes. The obtained results provided a suitable antifouling design of have studied the groove and convex surface with different sizes. 2–10 μm, rectangular micropits were selected for simulation to further improve the research content of
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