Effect of Temperature on Composite Fouling Characteristics of Magnesium Oxide and Calcium Carbonate:a Molecular Dynamics Simulation
The effect of temperature on the nucleation characteristics of composite fouling in the system and the formation of composite fouling on the heat exchange surface were studied using molecular dynamics simulation.The fouling was composed of MgO particle and calcium carbonate.The results show that with the increase of temperature,the compactness of the hydration layer on the surface of MgO particle and the hydration layer around ions decreases.But the diffusion coefficient of ions increases as temperature rises.As a result,the system's rate of mixed aggregation of MgO particle and calcium carbonate ions is sped up.The extent of adsorbed ions will additionally develop as temperature rises.But water molecules in the layer of adsorption on the heat transfer surface will decrease.With the increase of temperature,the probability of ions and particles deposited on the heat transfer surface increases,but the deposited cluster structure is closer.Therefore,the increase of temperature is more likely to promote the formation of composite fouling on the heat transfer surface.
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