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Experimental investigation of multiphase flow behavior in drilling annuli using high speed visualization

Alap Ali ZAHID, Syed Raza ur REHMAN, Anwarul HASAN, S. RUSHD, Mohammad Azizur RAHMAN

《能源前沿(英文)》 2020年 第14卷 第3期   页码 635-643 doi: 10.1007/s11708-018-0582-y

摘要: Imaging with high definition video camera is an important technique to visualize the drilling conditions and to study the physics of complex multiphase flow associated with the hole cleaning process. The main advantage of visualizing multiphase flow in a drilling annulus is that the viewer can easily distinguish fluid phases, flow patterns and thicknesses of cutting beds. In this paper the hole cleaning process which involves the transportation of cuttings through a horizontal annulus was studied. The two-phase (solid-liquid) and the three-phase (solid-liquid-gas) flow conditions involved in this kind of annular transportation were experimentally simulated and images were taken using a high definition camera. Analyzing the captured images, a number of important parameters like velocities of different phases, heights of solid beds and sizes of gas bubbles were determined. Two different techniques based on an image analysis software and MATLAB coding were used for the determinations. The results were compared to validate the image analyzing methodology. The visualization technique developed in this paper has a direct application in investigating the critical conditions required for efficient hole cleaning as well as in optimizing the mud program during both planning and operational phases of drilling. Particularly, it would be useful in predicting the cuttings transport performance, estimating solid bed height, gas bubble size, and mean velocities of bubbles/particles.

关键词: visualization     horizontal annulus     hole cleaning     multiphase flow     image analysis     flow regime    

土石方动态调配模型与可视化研究

胡程顺,钟登华,张静,洪文,李明超

《中国工程科学》 2003年 第5卷 第12期   页码 73-79

摘要:

土石方调配是土石坝或堆石坝施工中的一个核心问题,其合理与否对降低工程造价和保证工程的顺 利进行具有重要的经济、技术价值。根据其受时间-空间影响与约束的特点,文章在总结现有研究成果的基础 上,采用系统分析的手段,提出了一种将动态问题静态化的方法,并利用线性规划大M单纯形法对问题进行求 解。在数学模型上,深入而细致地考虑了实际施工中的一些人为约束因素,增强了模型的通用性与灵活性;借 助于GIS技术的强大空间信息处理功能,将土石方调配成果以三维动画的形式显示出来,以达到形象直观的目 的;在程序实现上,采用强大的程序设计语言工具VC++开发出了界面友好、操作简单、适用性强的软件。最 后,以其在某大型土石坝工程土石方调配项目中的成功应用,验证了此项研究工作的合理性与优越性。

关键词: 土石坝施工     土石方调配     动态调配     线性规划     可视化    

QUANTITATIVE STUDY ON ANTI-PEST ACTIVITY OF NATURAL PRODUCTS BASED ON VISUALIZATION FRAMEWORK OF KNOWLEDGE

《农业科学与工程前沿(英文)》 2023年 第10卷 第2期   页码 306-332 doi: 10.15302/J-FASE-2023488

摘要:

● Using visual analysis to predict the trend of natural product pest resistance.

关键词: anti-pest activity     crop protection     insect pest     natural product     visual analysis    

虚拟建筑群三维建模与可视化实现

张正峰,付金强,张发瑜

《中国工程科学》 2007年 第9卷 第5期   页码 53-56

摘要:

论述了地形、城市建筑物以及其他附属设施的三维模型建立方法;探讨了三维对象模型与地形模型 的匹配问题;分析了虚拟建筑群的三维可视化过程;采用三维可视化技术,实现了某建筑群的三维建模与可视 化表达,具有很好的实用性,为进一步进行数字城市的三维建模及可视化设计提供了一种辅助手段。

关键词: 虚拟建筑群     三维模型     可视化     地形匹配    

工程计算可视化的几个热点问题

郑澎,何铁宁

《中国工程科学》 2009年 第11卷 第9期   页码 44-47

摘要:

随着工程数值模拟的规模和复杂度的提高,可视化研究面临着发展机遇和挑战,结合国内外的技术发展情况,对于工程计算应用中的表达方式、算法优化、集成解决框架等几个热点问题展开讨论,指出可视化技术发展与应用学科结合的重要性。

关键词: 工程计算     工程数值模拟     可视化    

TDIVis:旅游目的地形象可视分析 Research

Meng-qi CAO, Jing LIANG1, Ming-zhao LI, Zheng-hao ZHOU, Min ZHU

《信息与电子工程前沿(英文)》 2020年 第21卷 第4期   页码 536-557 doi: 10.1631/FITEE.1900631

摘要: 旅游目的地形象研究在旅游学科中具有重要意义。旅游用户生成内容(UGC),即旅游网站中的用户反馈,为构建目的地形象提供了丰富信息。然而,由于UGC中目的地形象展示不够直观,且旅行出发时间、文本长度和目的地形象类别差异较大,旅游研究者难以获得较为完整、直观的目的地形象。我们设计一个可视分析系统TDIVis,旨在获得一个相对全面的目的地形象。具体而言,提出一种基于关键字的情感可视化方法,关联认知形象与情感形象,同时兼顾时序演变分析和分类对比分析;提出一种多属性关联双序列可视化方法,关联两种不同类型的文本序列,并为序列的多属性特征提供一种动态可视化编码交互方式。最后,通过4个案例和1个用户研究,验证TDIVis的有效性和可用性。

关键词: 旅游用户生成内容;信息可视化;目的地形象;情感可视化;时序可视化    

Visualization of amino acid composition differences between processed protein from different animal species

Xingfan ZHOU,Zengling YANG,Longjian CHEN,Lujia HAN

《农业科学与工程前沿(英文)》 2016年 第3卷 第2期   页码 171-179 doi: 10.15302/J-FASE-2016095

摘要: Amino acids are the dominant organic components of processed animal proteins, however there has been limited investigation of differences in their composition between various protein sources. Information on these differences will not only be helpful for their further utilization but also provide fundamental information for developing species-specific identification methods. In this study, self-organizing feature maps (SOFM) were used to visualize amino acid composition of fish meal, and meat and bone meal (MBM) produced from poultry, ruminants and swine. SOFM display the similarities and differences in amino acid composition between protein sources and effectively improve data transparency. Amino acid composition was shown to be useful for distinguishing fish meal from MBM due to their large concentration differences between glycine, lysine and proline. However, the amino acid composition of the three MBMs was quite similar. The SOFM results were consistent with those obtained by analysis of variance and principal component analysis but more straightforward. SOFM was shown to have a robust sample linkage capacity and to be able to act as a powerful means to link different sample for further data mining.

关键词: self-organizing feature maps     visualization     processed animal proteins (PAPs)     amino acid    

基于可视化的事故树分析系统研究与开发

施式亮,卢本陶

《中国工程科学》 2004年 第6卷 第11期   页码 66-72

摘要:

事故树分析是安全系统工程最重要的分析方法之一,它能对各种系统的危险性进行辨识和评价,不仅能分析出事故的直接原因,而且能深入地揭示出事故的潜在原因。用它描述事故的因果关系直观、明了,思路清晰,逻辑性强,既可定性分析,又可定量分析。基于可视化理论和技术,建立了事故树可视化模型,确定了系统功能目标,完成了系统结构设计,构造了事故树图形生成与事故树动态分析于一体的集成分析环境,开发出事故树计算机分析系统,为事故分析和安全评价提供高效、准确的技术和方法。

关键词: 安全技术     安全评价     事故树     可视化     分析系统    

Visualization of force networks in 2D dense granular materials

Jianguo LIU, Qicheng SUN, Feng JIN,

《结构与土木工程前沿(英文)》 2010年 第4卷 第1期   页码 109-115 doi: 10.1007/s11709-010-0003-8

摘要: Dense granular matter is a conglomeration of discrete solid and closely packed particles. As subjected to external loadings, the stress is largely transmitted by heavily stressed chains of particles forming a sparse network of larger contact forces. To understand the structure and evolution of force chains, a photoelastic technique was improved for determining stresses and strains in the assemblies of photoelastic granular disks in this paper. A two-dimensional vertical slab was designed. It contains 7200 polydispersed photoelastic disks and is subjected to a localized probe penetrating at the top of the slab to mimic the cone penetration test. The interparticle contact force distribution was found a peak around the mean value, a roughly exponential tail for greater force and a dip toward zero for smaller force. The force chain network around the probe tip was depicted, and the contact angle distribution of particles in force chains was found to be well aligned in the directions of major principal stress.

关键词: granular matter     force chain     multiscale modeling    

水电工程地质信息三维可视化与分析

刘东海,钟登华,李明超

《中国工程科学》 2004年 第6卷 第5期   页码 65-70

摘要:

传统工程地质资料的描述和解释直观性差,往往不能充分揭示地质构造空间变化的规律,所以越来越难以满足设计人员进行空间地质分析的要求,文章利用GIS和可视化技术,提出了水电工程地质信息数字化与三维可视化方法,实现了地质信息的可视化分析,工程应用表明该方法可为直观描述复杂地质构造的空间展布及其相互关系,以及进行工程地质交互设计提供有效的途径。

关键词: 水电工程     地质信息     三维可视化     GIS     地质分析    

CPU-GPU异构系统感知和预测的批处理内存调度策略 Research Article

吴子梁1,陈为1,马昱欣2,徐彤1,严凡1,吕檑1,钱中昊1,夏佳志3

《信息与电子工程前沿(英文)》 2023年 第24卷 第7期   页码 1007-1027 doi: 10.1631/FITEE.2200409

摘要: 自动可视化技术能够为不熟悉可视化设计的用户生成有意义的可视化,以支持他们的数据分析和模式发现需求。当前,主流的自动可视化方法采用聚合与过滤从原始数据抽取模式信息。然而,这些有限的数据变换并不能捕获聚类、关联等复杂的模式。尽管特征工程领域的最新进展为更加广泛的自动数据变换提供了可能,其结果却缺少可解释性,导致变换后的模式无法与原始数据特征建立联系。为应对上述挑战,我们面向自动可视化中广泛的数据变换类型,提出一种创新的可解释推荐方法。我们通过回顾既往文献总结可行的数据变换空间,通过开展预实验总结变换可解释性的度量。我们的推荐算法能够计算最优的数据变换,这种变换能够在维持可解释性的同时揭示数据的模式信息。真实场景下的使用案例与用户实验验证了我们方法的有效性。

关键词: 数据变换;数据变换推荐;自动可视化;可解释性    

Operando modeling and measurements: Powerful tools for revealing the mechanism of alkali carbonate-based sorbents for CO capture in real conditions

《能源前沿(英文)》 2023年 第17卷 第3期   页码 380-389 doi: 10.1007/s11708-023-0872-x

摘要: Alkali carbonate-based sorbents (ACSs), including Na2CO3- and K2CO3-based sorbents, are promising for CO2 capture. However, the complex sorbent components and operation conditions lead to the versatile kinetics of CO2 sorption on these sorbents. This paper proposed that operando modeling and measurements are powerful tools to understand the mechanism of sorbents in real operating conditions, facilitating the sorbent development, reactor design, and operation parameter optimization. It reviewed the theoretical simulation achievements during the development of ACSs. It elucidated the findings obtained by utilizing density functional theory (DFT) calculations, ab initio molecular dynamics (AIMD) simulations, and classical molecular dynamics (CMD) simulations as well. The hygroscopicity of sorbent and the humidity of gas flow are crucial to shifting the carbonation reaction from the gas−solid mode to the gas−liquid mode, boosting the kinetics. Moreover, it briefly introduced a machine learning (ML) approach as a promising method to aid sorbent design. Furthermore, it demonstrated a conceptual compact operando measurement system in order to understand the behavior of ACSs in the real operation process. The proposed measurement system includes a micro fluidized-bed (MFB) reactor for kinetic analysis, a multi-camera sub-system for 3D particle movement tracking, and a combined Raman and IR sub-system for solid/gas components and temperature monitoring. It is believed that this system is useful to evaluate the real-time sorbent performance, validating the theoretical prediction and promoting the industrial scale-up of ACSs for CO2 capture.

关键词: CO2 capture     carbonation     theoretical modeling     operando techniques     reaction visualization    

A review of recent experimental investigations and theoretical analyses for pulsating heat pipes

Xin TANG, Lili SHA, Hua ZHANG, Yonglin JU

《能源前沿(英文)》 2013年 第7卷 第2期   页码 161-173 doi: 10.1007/s11708-013-0250-1

摘要: Pulsating heat pipe (PHP), or oscillating heat pipe (OHP), a novel type of highly efficient heat transfer component, has been widely applied in many fields, such as in space-borne two-phase thermal control systems, in the cooling of electronic devices and in energy-saving technology, etc. In the present paper, the characteristics and working principles of the PHPs are introduced and the current researches in the field are described from the viewpoint of experimental tests, theoretical analyses as well as practical applications. Besides, it is found that the state-of-the-art experimental investigations on the PHPs are mainly focused on the flow visualization and the applications of nanofluids and other functional fluids, aiming at enhancing the heat transfer performance of the PHPs. In addition, it is also pointed out that the present theoretical analyses of the PHP are restricted by further development of two-phase flow theories, and are concentrated in the non-linear analyses. Numerical simulations are expected to be another research focus, in particular of the combination of the nanofluids and functional fluids.

关键词: pulsating heat pipe (PHP)     flow visualization     nanofluids     nonlinear analysis    

Visualization of vascular ultrastructure during osteogenesis by tissue engineering technique

ZHANG Kaigang, ZENG Bingfang, ZHANG Changqing

《医学前沿(英文)》 2007年 第1卷 第2期   页码 181-184 doi: 10.1007/s11684-007-0034-2

摘要: The aim of this paper was to observe and visualize the changes in osteoblasts by electron microscopy during osteogenesis using tissue engineering technique. We also studied the feasibility of improving tissue vascularization of th

关键词: feasibility     engineering     osteogenesis     vascularization     microscopy    

Multislice computed tomography angiography in the diagnosis of cardiovascular disease: 3D visualizations

Zhonghua Sun

《医学前沿(英文)》 2011年 第5卷 第3期   页码 254-270 doi: 10.1007/s11684-011-0153-7

摘要: Multislice computed tomography (CT) has been widely used in clinical practice for the diagnosis of cardiovascular disease due to its reduced invasiveness and high spatial and temporal resolution. As a reliable alternative to conventional angiography, multislice CT angiography has been recognized as the method of choice for detecting and diagnosing head and neck vascular disease, abdominal aortic aneurysm, aortic dissection, and pulmonary embolism. In patients with suspected coronary artery disease, although invasive coronary angiography still remains as the gold standard technique, multislice CT angiography demonstrates high diagnostic accuracy; in selected patients, it is considered as the first-line technique. The imaging diagnosis of cardiovascular disease is based on a combination of two-dimensional (2D) and three-dimensional (3D) visualization tools to enhance the diagnostic value. This is facilitated by reconstructed visualizations which provide additional information about the extent of the disease, an accurate assessment of the spatial relationship between normal structures and pathological changes, and pre-operative planning and post-procedure follow-up. The aim of the present article is to present an overview of the diagnostic performance of various 2D and 3D CT visualizations in cardiovascular disease, including multiplanar reformation, maximum intensity projection, volume rendering, and virtual intravascular endoscopy. The recognition of the potential value of these visualizations will assist clinicians in efficiently using the multislice CT imaging modality for the diagnostic management of patients with cardiovascular disease.

关键词: cardiovascular disease     multislice computed tomography     three-dimensional reconstruction     diagnosis     visualization    

标题 作者 时间 类型 操作

Experimental investigation of multiphase flow behavior in drilling annuli using high speed visualization

Alap Ali ZAHID, Syed Raza ur REHMAN, Anwarul HASAN, S. RUSHD, Mohammad Azizur RAHMAN

期刊论文

土石方动态调配模型与可视化研究

胡程顺,钟登华,张静,洪文,李明超

期刊论文

QUANTITATIVE STUDY ON ANTI-PEST ACTIVITY OF NATURAL PRODUCTS BASED ON VISUALIZATION FRAMEWORK OF KNOWLEDGE

期刊论文

虚拟建筑群三维建模与可视化实现

张正峰,付金强,张发瑜

期刊论文

工程计算可视化的几个热点问题

郑澎,何铁宁

期刊论文

TDIVis:旅游目的地形象可视分析

Meng-qi CAO, Jing LIANG1, Ming-zhao LI, Zheng-hao ZHOU, Min ZHU

期刊论文

Visualization of amino acid composition differences between processed protein from different animal species

Xingfan ZHOU,Zengling YANG,Longjian CHEN,Lujia HAN

期刊论文

基于可视化的事故树分析系统研究与开发

施式亮,卢本陶

期刊论文

Visualization of force networks in 2D dense granular materials

Jianguo LIU, Qicheng SUN, Feng JIN,

期刊论文

水电工程地质信息三维可视化与分析

刘东海,钟登华,李明超

期刊论文

CPU-GPU异构系统感知和预测的批处理内存调度策略

吴子梁1,陈为1,马昱欣2,徐彤1,严凡1,吕檑1,钱中昊1,夏佳志3

期刊论文

Operando modeling and measurements: Powerful tools for revealing the mechanism of alkali carbonate-based sorbents for CO capture in real conditions

期刊论文

A review of recent experimental investigations and theoretical analyses for pulsating heat pipes

Xin TANG, Lili SHA, Hua ZHANG, Yonglin JU

期刊论文

Visualization of vascular ultrastructure during osteogenesis by tissue engineering technique

ZHANG Kaigang, ZENG Bingfang, ZHANG Changqing

期刊论文

Multislice computed tomography angiography in the diagnosis of cardiovascular disease: 3D visualizations

Zhonghua Sun

期刊论文