Field synergy analysis and optimization of the convective mass transfer in photocatalytic oxidation reactors
Field synergy analysis and optimization of the convective mass transfer in photocatalytic oxidation reactors
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DOI：
10.1016/j.ijheatmasstransfer.2007.09.024
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发表时间：
2008-06
影响因子：
5.2
通讯作者：
Qun Chen;Ji’an Meng
中科院分区：
文献类型：
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作者：
Qun Chen;Ji’an Meng
基于传质位能耗散极值原理，建立了具有特定边界条件的光催化氧化反应器对流传质场协同方程，可在整个流体流域中增强速度场与污染物浓度梯度场之间的场协同作用，以增强光催化氧化反应器的对流传质，提高其除污效果。场协同方程的解给出了最优流场，在给定的粘性耗散下具有最佳的场协同，使污染物去除效果最大化。以板式反应器层流传质过程的场协同分析为例。分析表明，在板式反应器内产生多个纵向涡流，可以有效地增强层流传质。在最佳速度模式的指导下，在实际应用中可以引入离散双斜肋，产生所需的多纵向涡流，从而增强层流传质，从而提高污染物去除性能。实验结果表明，分离式双斜肋板反应器对污染物的去除率比光滑板反应器提高了22%。
A convective mass transfer field synergy equation with a specific boundary condition for photocatalytic oxidation reactors developed based on the extremum principle of mass transfer potential capacity dissipation can be used to increase the field synergy between the velocity and contaminant concentration gradient fields over the entire fluid flow domain to enhance the convective mass transfer and increase the contaminant removal effectiveness of photocatalytic oxidation reactors. The solution of the field synergy equation gives the optimal flow field, having the best field synergy for a given viscous dissipation, which maximize the contaminant removal effectiveness. As an illustrative example, the field synergy analysis for laminar mass transfer in plate type reactors is presented. The analysis shows that generating multiple longitudinal vortex flow in the plate type reactor effectively enhances the laminar mass transfer. With the guide of the optimal velocity pattern, the discrete double-inclined ribs can be introduced in actual applications to generate the desired multi-longitudinal vortex flow, so as to enhance the laminar mass transfer, and consequently, improve the contaminant removal performance. The experimental result shows that the contaminant removal effectiveness for the discrete double-inclined ribs plate reactor is increased by 22% compared to the smooth plate reactor.