To explore the deposition characteristics of composite fouling on rough surfaces,this study takes the mixed system composed of MgO particle and calcium carbonate solution as the research object.The molecular dynamics simulation method was used to analyze the deposition mechanism of composite fouling on different rough surfaces and under motion states.The results show that in a static state,Ca2+and CO32-in the mixed system are adsorbed on the surface of MgO particle and the wall to form calcium carbonate clusters,and MgO particle are indirectly adsorbed on the wall through calcium carbonate clusters.The interaction energy between ions and particles with wall surface increases with increasing wall roughness coefficient,and more Ca2+and CO32-were adsorbed.Under motion conditions,the deposition process of composite fouling exhibits similar patterns as in a static state.The action of shear forces prolongs the deposition time of composite fouling,and the roughness significantly affects the deposition of composite fouling.The deposition of MgO particle on the wall surface is related to the number of adhesion points of Ca2+and CO32-on the surface of MgO particle and the bond strength between calcium carbonate clusters and the wall.Moreover,Ca2+and CO32-are more likely to deposit on the top surface and edges near the rough structure of the wall.
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