构造板式微通道用于互不相溶的液-液两相分散体系的连续快速分离。通过改变上板的材料可以构造GS-PTFE、SS-PTFE和PTFE-PTFE 3种类型的板式微通道。萃取后产生的油水分散体系在微通道中通过与通道上下壁面的相互作用实现油水两相的快速...构造板式微通道用于互不相溶的液-液两相分散体系的连续快速分离。通过改变上板的材料可以构造GS-PTFE、SS-PTFE和PTFE-PTFE 3种类型的板式微通道。萃取后产生的油水分散体系在微通道中通过与通道上下壁面的相互作用实现油水两相的快速分离,分离后的油相从微通道的油相出口流出,水相从水相出口流出。微通道的分离效率与微通道的高度、液-液分散体系在通道中的体积流率、微通道与液-液分散体系的接触时间以及微通道的类型有关。高度为100μm的GSPTFE型微通道在体积流率低于4.8 m L/min的条件下可以实现油水两相的完全分离,其分离效率为100%。相比于传统的重力沉降分离方式,板式微通道极大地节约了液-液两相分离的时间,提高了工作效率。展开更多
The basic flow model of laminar flow field and the trajectory model of dispersed phase drops are derived. Based on the comparable volumetric flow rate, the dispersed flow rate can be linearly discretized. Consequently...The basic flow model of laminar flow field and the trajectory model of dispersed phase drops are derived. Based on the comparable volumetric flow rate, the dispersed flow rate can be linearly discretized. Consequently, the trajectory of a droplet in the channel can be tracked, and the trajectories of all drops are observed in order to statistically analyse the drops for capture or entrainment. Therefore, in terms of theoretical model of motion, the stratified two phase flow systems are studied in the mixture of nitrobenzene and concentrated sulfuric acid. The analytical results indicate that the trajectories of droplets of different diameters are different at the same location. The larger droplets can help to promote the efficiency of plate separators. The thickness of trickling film has a significant influence on the efficiency of numerical simulation when the concentration of the dispersed phase is greater than 10%. So the modification of thickness of trickling film can help to get the real flow field efficiency. The low flow rate lowers the average Renolds number so that the lighter phase droplets have sufficient time to interact with the trickling film. It is an indispensable factor for predicting efficiency that coalesced drops flow off inclined plates together with trickling films. A comparison confirms that the simulation results are in good agreement with the experiment results.展开更多
文摘构造板式微通道用于互不相溶的液-液两相分散体系的连续快速分离。通过改变上板的材料可以构造GS-PTFE、SS-PTFE和PTFE-PTFE 3种类型的板式微通道。萃取后产生的油水分散体系在微通道中通过与通道上下壁面的相互作用实现油水两相的快速分离,分离后的油相从微通道的油相出口流出,水相从水相出口流出。微通道的分离效率与微通道的高度、液-液分散体系在通道中的体积流率、微通道与液-液分散体系的接触时间以及微通道的类型有关。高度为100μm的GSPTFE型微通道在体积流率低于4.8 m L/min的条件下可以实现油水两相的完全分离,其分离效率为100%。相比于传统的重力沉降分离方式,板式微通道极大地节约了液-液两相分离的时间,提高了工作效率。
文摘The basic flow model of laminar flow field and the trajectory model of dispersed phase drops are derived. Based on the comparable volumetric flow rate, the dispersed flow rate can be linearly discretized. Consequently, the trajectory of a droplet in the channel can be tracked, and the trajectories of all drops are observed in order to statistically analyse the drops for capture or entrainment. Therefore, in terms of theoretical model of motion, the stratified two phase flow systems are studied in the mixture of nitrobenzene and concentrated sulfuric acid. The analytical results indicate that the trajectories of droplets of different diameters are different at the same location. The larger droplets can help to promote the efficiency of plate separators. The thickness of trickling film has a significant influence on the efficiency of numerical simulation when the concentration of the dispersed phase is greater than 10%. So the modification of thickness of trickling film can help to get the real flow field efficiency. The low flow rate lowers the average Renolds number so that the lighter phase droplets have sufficient time to interact with the trickling film. It is an indispensable factor for predicting efficiency that coalesced drops flow off inclined plates together with trickling films. A comparison confirms that the simulation results are in good agreement with the experiment results.
