Results 81 to 90 of about 19,312 (167)
CFD MODELLING FOR THE EFFECT of CIRCULAR FLOW RATE ON THE LIQUID-SOLID FLOW IN A LOOP REACTOR [PDF]
, 2010 以聚丙烯工艺中的环管反应器(包括环管与轴流泵)为研究对象,首先通过CAd软件绘出该反应器的三维模型,然后在gAMbIT软件中划分该系统的网格。在此基础上,建立了环管反应器内液-固两相的“颗粒动力学-欧拉双流体“模型。其中,采用颗粒动力学描述固相(颗粒相)黏度与压力,采用多重坐标系模型描述轴流泵。采用上述模型模拟了循环流速对环管反应器内液-固两相流动行为的影响。结果表明,高循环流速有助于颗粒在环管“直管“部分均匀分布,但将造成颗粒在环管“弯管“部分不均匀分布。In the present study ...
施德磐, 罗正鸿, 郑祖伟
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Analysis of electrical resistivity and acoustic wave velocity characteristics in fault structures and their combined application in the detection process [PDF]
Finding out the specific location of the fault structure is of great significance for the engineering site selection and stability evaluation. Electrical resistivity tomography and acoustic logging are geophysical methods widely used in detecting ...
Chen YANG +5 more
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He jishu在原子核密度泛函理论框架下，理论预测的不确定度可分为两类：模型内参数不确定度引起的统计误差和模型间系统误差。前者源于参数校准过程中实验数据的误差传递，后者表现为不同模型对同一物理量预测的系统性差异。本文介绍了用于量化这两类不确定度的贝叶斯推断方法，并重点阐述了其两个典型应用：基于机器学习的贝叶斯参数估计在原子核密度泛函参数校准中的应用以及贝叶斯模型平均方法在量化核物质对称能模型间系统不确定度中的应用。
丘 梦莹, 张 振
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Effect of particle size on the thermal conductivity and viscosity of nanofluids: A review [PDF]
Nanofluids, recognized as advanced media for heat and mass transfer, have demonstrated substantial potential across diverse engineering applications, particularly in scenarios demanding enhanced thermal management and improved energy efficiency ...
Pengxiang SUI
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Gaoya dianqi, 2016 在高压断路器灭弧室动态流场的数值计算中,常常需要快速而准确地提取涉及动网格技术的ANSYS流场海量计算结果,并绘制相关物理参数随时间变化的曲线图。通过集成ANSYS CFD-POST和MATLAB两款商业软件进行了流场后处理的二次开发工作,研制了一种提取相关数据的程序。以某实际高压断路器灭弧室动态流场计算结果为例,将其应用于目标点几何位置变化、相关物理参数变化等工况,验证了该程序的可行性和高效性。结果表明,该程序能很好地解决动态流场后处理中海量数据的提取困难,避免大量额外工作等 ...
惠伟, 张建, 张猛
doaj
Prediction of thermal conductivity of 93W–Ni–Fe alloys in sintering process based on finite element analysis [PDF]
Thermal conductivity is an important thermophysical parameter required for the numerical simulation of constitutive equations. The existing thermal conductivity measurement equipment and methods cannot measure the thermal conductivity of refractory ...
PAN Qian +6 more
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Gaoya dianqi, 2019 导体温度作为运行电缆的关键状态参数,是影响电缆载流能力、绝缘性能的重要因素。针对传统方法难以克服电缆本身物性参数和外部环境变化影响的局限,构建了以电缆运行电流和电缆实时外表面温度为输入,以导体温度为输出的Elman神经网络模型,并引入粒子群算法优化网络的初始权值和阈值。最后,提出了具体的电缆导体温度动态计算方法,通过设计不同工况下电缆温升实验,进而验证了所提出方法的有效性。实验结果表明,所提方法的计算准确度可以不受电缆物性参数、负荷变化方式及外部环境变化的影响,有助于实现电缆导体温度的实时监测。
付明星 +4 more
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Kongjian kexue xuebao介电特性是决定雷达波在物质中传播速度的重要参数. 嫦娥四号测月雷达提供的高垂向分辨率次表层雷达剖面信息有助于加深对月球次表层物质介电特性的理解与认识. 全波形反演法充分利用雷达波场的运动学和动力学信息, 根据雷达波模拟结果与真实数据的差异计算更新参数, 迭代初始介电模型实现对次表层介电剖面的反演.
陈 书睿 +8 more
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Numerical Study of Deposition Characteristic of Corrosion Product in Lead-bismuth Cooled Wire-wrapped Rod Bundle [PDF]
Lead-based reactor using liquid lead-bismuth alloys as coolant has many advantages and is a promising type of fourth-generation reactors for a wide range of applications.
HUANG Rui, SUN Yubo, FU Junsen, XIAO Yao, GU Hanyang
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Theoretical basis and field experiment of low-temperature gathering and transportation for high water-cut crude trunk pipeline [PDF]
Objective Most inland oil fields in China are currently in the high water-cut production stage, with a water cut of generally above 90% and even exceeding 95% in some blocks.
Fuqiang ZHANG +3 more
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