微通道结构数值模拟及实验性能评价

Fluent软件的数值模拟结果显示伞形微通道结构比U形直线形微通道结构具有更加高效的混合效率，但该结构也存在流动死区，结合优化方向提出一种压降更小、混合效率较优更适用于液-液非均相反应的菱形微通道结构。同时，本文利用前述3种不同微通道结构反应器及常规反应器开展丙烯酸十四酯的合成评价对比实验，红外光谱及核磁谱图对反应产物的分析表征均证明了丙烯酸十四酯的生成。常规反应器和微反应器在相似工艺条件下，丙烯酸十四酯的收率仅为82%，停留时间更是长达300min，而微反应器中收率均达到90%以上，停留时间不超过3.5min，且菱形微通道结构反应器比U形直线形和伞形微通道结构反应器所得丙烯酸十四酯的收率都大，达到97%，说明菱形微通道结构更加有利于物料间的充分混合反应，这与菱形微通道结构数值模拟显示的结果是一致的，从而验证了数值模拟结果的可靠性。

Numerical simulation and experimental performance evaluation of microchannel structure

The numerical simulation results of Fluent software showed that the umbrella-shaped microchannel structure had higher mixing efficiency than the U-shaped linear microchannel structure, but this structure also had flow dead zones. Combined with the optimization direction, a diamond-shaped microchannel structure with smaller pressure drop and better mixing efficiency was proposed, which was more suitable for liquid-liquid heterogeneous reaction. Meanwhile, three different microchannel structure reactors, which were described above, and conventional reactor were used to carry out the comparative evaluation synthesis experiment of tetradecyl acrylate (TA). The analysis and characterization of FTIR and NMR for reaction products had demonstrated the formation of TA. In the conventional reactor, the yield TA was only 82% and the residence time was up to 300minutes. The yields of TA in the microreactors was more than 90% and the residence time was less than 3.5minutes. The yields of TA in the diamond-shaped microreactor was higher than that in the U-shaped linear and umbrella-shaped microreactor, which was up to 97%, indicating that the diamond-shaped microchannel structure was more conducive to the full mixing reaction. It was consistent with the numerical simulation results of the diamond-shaped microchannel structure, verifying the reliability of numerical simulation results.