【摘要】 在区别结晶和结垢诱导期前提下,建立了CaCO₃在加热表面非均相成核结垢诱导期的数学模型,计算得到了该诱导期与壁面过饱和度、壁面温度、流体流速及表面性能的关系。以离子注氮的表面改性技术,制备低表面能无附加热阻的金属基新表面,实验研究了该表面对结垢诱导期的影响,发现它可延长结垢诱导期0.5～1倍以上,证实了表面性能同结垢诱导期的关系。更多还原

【Abstract】 By distinguishing the induction period of scaling (IPS)and that of crystallization, a mathematical model was established for IPS of CaCO3 which heterogeneously nucleated on heated surfaces. The relationships between IPS and surface wall supersaturation, surface wall temperature, fluid flow velocity and surface properties were obtained through computation. The surface treatment technique of ion implant nitrogen was used to prepare new surfaces with low surface energy and without additional thermal resistance of metal substrates. The effects of these improved surfaces on IPS were experimentally investigated. It was found that IPS on treated surfaces was 0. 5-1 times longer than that on untreated surfaces.更多还原