摘要
在多相流耦合光催化体系中,聚团是动态、多尺度分布的,尺度也是瞬时变化,仅靠宏观或微观方法难以解决光催化流化聚团动态尺度评估难题.本文首先从现代仪器实验检测、数值模拟、数学模型、床层空隙率估算与测量等多方面总结了流化聚团尺度的评估方法,评述了各种方法在实践中的优势特点和局限性.最后针对光催化耦合多相流体系流化聚团动态尺度提出了新的评估思路和理论方法——将多相流耦合光催化体系中的微观信息和宏观参数结合起来,以关键参数反应分子数为关联索引,把构建的碰撞概率函数和空隙率分布函数引入到含有流化聚团活性特征参数的光催化反应动力学方程中,通过代入、迭代和拟合等方法构建关联宏观与微观多尺度信息的流化聚团动态尺度与光催化活性评估模型.
Abstract
For the multi-phase fluidization coupling photocatalysis multi-scaled system,it is a hard nut to crack the evaluation of fluidized agglomerates dynamic scale only by the macro/micro-methods,since the fluidized agglomerates are dynamic,multi-scaled distributed,and changed instantaneously.In this case,the evaluation methods for dynamic scale of photocatalytic fluidized agglomerates in multi-phase fluidization were summarized from modern installment detection,mathematic model,and numerical simulation,evaluation and detection methods of bed voidage,etc.The superiority and limitations of these methods in practice were further analyzed.Finally,the creative thought and method of evaluation of fluidized agglomerates dynamic scale in photocatalysis coupling multi-phase fluidization system were put forward as follows.Combining microscopic information and macroscopic parameters in the multi-phase fluidization coupling photocatalysis multi-scaled system,using the key parameters,such as the number of molecules as the correlation index,by introducing the constructed collision probability function and bed voidage distribution function into the photocatalytic reaction kinetics equation containing fluidized agglomerate reactivity characteristic parameters,the novel agglomerate dynamic scale and photocatalytic reactivity integrated model concerning macro-and micro-information could be achieved by substitution method,iterative method,and fitting technology.
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