摘要：A swimming pool can be considered as a chemical reactor with specific hydraulic and macro-mixing characteristics. The nature of flow into the pool depends on various characteristics, such as water inlets and outlets (number and position), pool geometry, and flow rate. This study investigates how swimming pool design affects hydraulic behavior based on experimental and computational fluid dynamics studies (CFD). This paper does not describe the hydraulic behavior of all existing swimming pools, however the cases studied here are representative of pool designs widely used in Europe and the United States. The model developed, based on the principle of a stirred reactor, could be used as a first approach in describing the hydraulic behavior of regular pools. This model is suitable for the study of physical and chemical phenomena with long characteristic times. Other, more advanced, models were shown to be more suitable to the case of fast chemical processes.

摘要：Herein,a novel photonic coordination polymer material was constructed by aggregation-induced emission luminogen(AIEgen)containing a tripyridyl moiety used as the linking *** displayed a spontaneous direct centrosymmetric to noncentrosymmetric phase transition in a single *** two crystals,before and after the phase transition,were both controllably synthesized and characterized by single-crystal X-ray *** being exposed to air,the centrosymmetric metastable phase(1-α)transitioned to a new stable phase with a noncentrosymmetric structure(1-β).Interestingly,the 1-βstructure exhibited a strong phasematching second-harmonic generation(SHG)response,about4.5 times higher than that of KH2PO4(KDP).In order to better understand the relationship between the structure and the nonlinear optical properties,the dipole moments were calculated and ***,the noncentrosymmetric phase with high thermal stability for 1-βretained and improved the initial photoluminescent properties of the AIEgen ligand after the structural phase transition from 1-α,and simultaneously produced the excellent SHG property,which are beneficial for the design and construction of excellent optical materials.

摘要：采用高速摄像仪对聚焦十字型微装置内分散小气泡的生成进行了研究。方形截面微通道的尺寸分别为400μm×400μm和600μm×600μm。氮气为气相,加入表面活性剂十二烷基硫酸钠(sodium dodecyl sulfate,SDS)(0～0.5%(wt))的水—甘油(25%(wt),50%(wt),62%(wt))溶液为液相。考察了不同的操作条件如液体流速、黏度和表面张力对气泡生成尺寸的影响。泡状区内生成的气泡尺寸随连续相流体流量和黏度的增大而减小,随表面张力的增大而增大。讨论了气泡的生成机理,提出了一个新的指数模型来描述气泡生成尺寸与局部毛细管数的关系。