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钙钛矿纳米晶的合成通常是使用间歇式搅拌系统进行（将前驱液滴加入反溶剂甲苯）。宏观间歇式反应器在高耗能的同时，并不能保证制备的纳米晶的尺寸均匀可控，实验的重复性也不好。而微流体具有高效的传质传热特性，以及良好的可操纵性。同时体系反应体积的急剧下降使得反应过程的不确定性大大降低。这样保证所有晶体拥有相同的成核和生长环境。所以使用微反应器制备的纳米晶的尺寸均匀可控。由结晶动力学可知，结晶过程的溶液过饱和度以及晶核周围的速度场分布对产物晶体有影响。所以我们使用COMSOL软件对比了微反应器和间歇式反应器运行时的体系的速度场和浓度场的分布情况。以达到调控产物晶体的质量的目的。 Mehr lesen
Microwave discharges have a wide range of applications, such as gas conversion, material processing and surface treatment; also they can provide an efficient way for dissociation of molecular gases as CO2 and N2O. Depending on the operating pressure and temperature, non-equilibrium ... Mehr lesen
Ultrasonic technology is used for various crucial measurements in the industry; few of the most popular uses are in Non-destructive testing, flow measurement, level measurement etc. Like every other energy waveform the ultrasonic waveforms also suffers attenuation while travelling ... Mehr lesen
Due to the Paschen law the ignition voltage for plasma increases proportionally to electrode gap and pressure between electrodes. Atmospheric plasmas operating in the MHz range, being of great interest for surface treatment, require therefore high voltage power supplies, even though in ... Mehr lesen
Two different Finite Element Method (FEM) models of the CANDU® nuclear fuel channels were compared against experimental data to determine if the curvature of the fuel channels is necessary to consider for measurements of the pressure tube to calandria tube gap. The different models were ... Mehr lesen
铁芯电抗器作为电力系统中重要的基础设备之一，具有漏磁小、节省空间等优点，因此在新能源和城市配电系统中得到广泛应用。但其运行中产生的噪声严重污染周边环境，而且电抗器振动过大对其自身正常运行也会构成威胁。本文在磁致伸缩效应和麦克斯韦方程相关理论研究基础上，采用COMSOL Multiphysics®多物理场仿真软件，通过AC/DC模块、声-固模块对三相电抗器铁芯的振动噪声进行研究。首先从多物理场耦合的角度，定义瞬态计算条件，然后在瞬态磁场的基础上加上声场和固体力场来建立三维物理模型，最后通过多物理场的耦合计算，得到电抗器铁芯振动位移和声压场分布 ... Mehr lesen
微波化学反应的研究，一般要求实验装置要具有尺寸小、工作频带等特点，基于这种要求，近年来一种同轴式的微波反应器应运而生。本文基于COMSOL Multiphysics® 软件，对两种不同结构的同轴式微波反应器进行对比分析。结构主体是由外导体和内导体形成的同轴腔体，内外导体由金属材料构成可承受一定的高压反应。反应器一端为短路面，另一端结构一填充了截锥形聚四氟乙烯插件，结构二为填充了一定厚度的柱形聚四氟乙烯。我们建立了两种结构的二维轴对称模型，通过电磁波-频域接口、层流接口以及流体传热接口对其进行模拟计算，探究不同介质下反应器的加热效果。数值仿真结果如图2、图3、图4所示 ... Mehr lesen
The excessive presence of residual SiC matrix inter-fiber pores is often the main cause for the very poor mechanical strength and toughness of SiC/SiC composites manufactured by CVI (Chemical Vapour Infiltration) process. This work presents a micro/macro Microwaveassisted Chemical Vapour ... Mehr lesen
TAP (Temporary Analysis of Products) reactors are powerful instruments to study the kinetics of catalytic reactions. Their basic principle, exposition of evacuated solids of interest to narrow pulses containing very small amounts of gases, and measuring the concentrations of outgoing ... Mehr lesen
Modernization of the High Flux Isotope Reactor (HFIR) thermal-hydraulic (TH) design and safety analysis capability is an important step in preparation for the conversion of the HFIR core from a high enriched Uranium (HEU) fuel to a low enriched Uranium (LEU) fuel. Currently, an important ... Mehr lesen