Jet breakup and droplet formation in near-critical regime of carbon dioxide-dichloromethane system

The jet breakup and droplet formation mechanism of a liquid in the near-critical conditions of a solvent-antisolvent system is examined with high-speed visualization experiments and simulated using a front tracking/finite volume method. The size of droplets formed under varying system pressure at various jet breakup regimes is measured with a Global Sizing Velocimetry, using the shadow sizing method. A stainless steel nozzle with 0.25 mm I.D and 1.6 mm O.D was used in this study. Experiments were performed at fixed temperature of 35 °C and system pressure in the range from 61 to 76 bar in the near-critical regime of the DCM-CO₂. At the near mixture critical regime for DCM-CO₂ mixture, the miscibility between the two fluid phases increases and the interfacial tension diminishes. This phase behavior has important applications in particle formation using gas antisolvent (GAS) and supercritical antisolvent (SAS) processes. The jet breakup and droplet formation in the near-critical regime is strongly dependent on the changes in interface tension and velocity of the liquid phase. An understanding of the droplet formation and jet breakup behavior of DCM-CO₂ in this regime is useful in experimental design for particle fabrication using SAS method.     

大庆油田多学科油藏研究一体化平台研制

多学科油藏研究一体化平台是基于Windows操作系统、以局域网络为传输通道、以开发数据库和精细地质研究成果为基础的多学科工作平台。本文扼要介绍了平台的研发背景、总体思路、开发环境,详细描述了数据共享、精细地质建模、精细油藏数值模拟及三维可视化的功能设计与实现方法,最后客观评价了平台的优势与不足。     

封闭式行星传动的功率特性分析与可视化

对封闭式行星传动的功率流特性、传动效率、自锁条件等进行了深入分析,提出了以主支路功率大小与输入总功率大小的比值为关键功率设计参数妒的新分析方法,并给出了系统实现功率分流和自锁的基本判别准则。在建立数学模型的基础上,以C＋＋ Builder 6．0为工具,设计开发了功率流特性分析的可视化系统软件,为合理确定设计参数和筛选传动方案提供了有益的帮助。     

液压系统设计与试验的虚拟样机技术

本文在介绍了虚拟样机技术的基础上，分析和阐述了开发具有虚拟样机功能的液压系统设计与试验软件的模型。     

焊接工艺参数化编程的设计与应用

传统的工业机器人在焊接领域的应用主要是根据示教编程器对焊接参数、路径的点位进行手动依次示教而完成的,在面对一些规则但轨迹具有重复性的焊接模型时,传统手动示教效率较低、操作繁琐.针对一种仿α梁盒的焊接应用,结合自主研发的焊接工艺包,设计一套可用于规则模型焊接的可视化参数编程模块,该模块可根据导入模型的关键参数,生成模型样...     

Visualization of film wavelike characteristics and measurement of film thickness in spray cooling

An experimental investigation was performed to study the heat transfer in an eight-nozzle spray cooling system with de-ionized water as the working fluid. Visualization of the liquid-solid contact area and the flow near the heated surface was made using a microscopic lens system in conjunction with an advanced high-speed camera. The film thickness and film wavelike characteristics under liquid volume flow rates ranged from 2.78×10 -6 m 3 /s to 1.39×10 -5 m 3 /s and surface temperatures between 22℃ and 78.2℃ were examined respectively. The development process of the liquid film on the heated surface was observed. The local mean film thickness, the film wavelike characteristics and the behavior of the bubbles appeared in the liquid film were captured using an image processing technique. It is discovered that there exists a climax of local mean film thickness during the starting process of spray cooling. When the liquid film reaches the dynamic stable state, the dimensionless mean film thickness decreases with the increase of the liquid volume flow rate, and increases with the increase of surface temperature generally. Besides, the volume flow rate has a more significant impact on the wavelength and amplitude of the liquid film compared to the surface temperature.     

数字矿床概述

数字矿床的提出是为了整体解决矿床及其相关资源信息的快速、全面、精确的采集、存取、处理、分析和表达等问题,最大限度地利用知识资源,将大量无序、分散的矿床信息加以有序集成整合,形成经创新的新知识,通过计算机网络有针对性地提供给使用者。数字矿床的理论基础是地质学,实现数字矿床的技术主要是计算机技术,认知科学是将理论与实践联系起来的纽带。数字矿床研究的内容包括矿床数字化、矿床可视化、虚拟矿床和矿床知识管理。     

地矿三维建模及可视化的研究

地矿三维建模及其三维可视化对地质、矿藏信息的获取及地质现象解释具有十分重要的意义。采用基于TIN的多层DEM方法，实现层状地矿实体模型的三维重构，借助于OpenGL图形库实现了层状实体模型的三维可视化，并对模型进行了光照渲染、漫游和切割等操作。     

管网可视化调度技术在川西气田的应用

管道仿真技术是日常天然气集输管理中，提高天然气集输调度科学水平、提高管网运行的经济性和安全性的关键。文章介绍的管道仿真调度是根据川西气田管网特点建立的一套服务于管网设计、改造以及运行分析和调度管理等方面的实用技术。它与地理信息可视化技术相结合，形成了具有管网分析功能特征的管道可视化调度技术，使管网规划、管理和运营变得科学、直观和高效。该技术在川西气田天然气集输配调度、管道系统的维护改造、增压方案优化以及新井投产路线规划等方面都发挥了重要作用，保证了该地区集输管网的安全营运。     

结构可靠性可视化技术及其应用

介绍了结构可靠性可视化相关技术 ,如通用有限元软件、结构可靠性可视化实现方法等。以有限元软件ANSYS为平台 ,自行开发了结构可靠性可视化模块———Fatigue/ANSYS ,并以此对某战斗机起落架框“全场”疲劳寿命及可靠性进行了分析。对发展基于可视化技术的虚拟疲劳设计思想具有重要的参考价值