Subjects: Mechanics >> Basic Mechanics submitted time 2023-04-24 Cooperative journals: 《应用力学学报》
Abstract： This paper is intended for the study of a right-angle flexible elbow with a large bending diameter ratio.A numerical simulation on the erosion characteristics of gas-solid two-phase flow in the elbow is conducted employing the Fluent simulation software package,in which such factors as gas inlet velocity,mass flow rate of entrained solid particles,elbow ribs and bending diameter ratio under different working cases are considered based on the discrete phase model and the General erosion model.The results show that the velocity distribution of the gas-solid two-phase flow field in the longitudinal section of the elbow is separated.The maximum erosion rate of elbow varies exponentially with the increase of the gas inlet velocity,and linearly with the increase of the particle mass flow rate.As the number of ribs embedded in the inner wall of elbow increases,the erosion ratio firstly decreases and then slightly increases and finally stabilizes.The strength of the secondary flow in the large bend is smaller than that in the elbow,and the erosion resistance of the elbow improves to a certain extent due to the existence of ribs.The severely eroded area in the elbow occurs in the area where the elbow deflects along the flow direction at an angle of about 26° and presents V-shaped erosion morphology,which is caused by the special particle movement trajectory at the elbow.The groove-like erosion morphology appears within the angle range of 60°-80° along the flow direction,which is due to the secondary and multiple collisions of particles in the elbow.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-07 Cooperative journals: 《工程热物理学报》
Abstract：大气中水蒸气会影响气溶胶颗粒的生长演化动力学特性，从而改变其环境效应。当前，对包含有机组分气溶胶颗粒与水相互作用机理的认识还很局限。本文建立了纯有机气溶胶和有机一无机混合气溶胶颗粒水溶特性研究分子动力学模型，分别模拟了不同温度条件下不同卤化钠盐(Na工/NaCl/NaF)对丙二酸(C3H40户团簇水溶特性的影响情况。重点分析了各影响因素作用下团簇结构和气粒界面特性。结果表明，温度升高，C3H404 H}O团簇相继出现分层结构和混合结构。加入40个卤化钠分子后，水分子对初始团簇溶解程度的排序为40NaF<40NaCl
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