检索结果-南通市图书馆

Microscopic and macroscopic atomization characteristics of a pressure-swirl atomizer, injecting a viscous fuel oil

Chinese Journal of Chemical Engineering 2020年第1期28卷 9-22页

作者： Seyed Mohammad Ali Najafi Pouria Mikaniki Hojat Ghassemi School of Mechanical Engineering Iran University of Science and Technology(IUST)P.O.B.16765-163TehranIran

Combustion of heavy fuels is one of the main sources of greenhouse gases, particulate emissions, ashes, NOxand SOx. Gasification is an advanced and environmentally friendly process that generates combustible and clean gas products such as hydrogen. Some entrained flow gasifiers operate with Heavy Fuel Oil(HFO) feedstock. In this application, HFO atomization is very important in determining the performance and efficiency of the *** atomization characteristics of HFO(Mazut) discharging from a pressure-swirl atomizer(PSA) are studied for different pressures difference(Δp) and temperatures in the atmospheric ambient. The investigated parameters include atomizer mass flow rate( _m), discharge coefficient(CD), spray cone angle(θ), breakup length(Lb), the unstable wavelength of undulations on the liquid sheet(λs), global and local SMD(sauter mean diameter) and size distribution of droplets. The characteristics of Mazut sheet breakup are deduced from the shadowgraph technique. The experiments on Mazut film breakup were compared with the predictions obtained from the liquid film breakup model. Validity of the theory for predicting maximum unstable wavelength was investigated for HFO(as a highly viscous liquid). A modification on the formulation of maximum unstable wavelength was presented for HFO. SMD decreases by getting far from the atomizer. The measurement for SMD and θ were compared with the available correlations. The comparisons of the available correlations with the measurements of SMD andθ show a good agreement for Ballester and Varde correlations, respectively. The results show that the experimental sizing data could be presented by Rosin-Rammler distributions very well at different pressure difference and temperatures.

关键词： Gasifier Heavy fuel oil Atomization Pressure-swirl atomizer Mazut Size distribution Wavelength Viscosity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FLUID KINETICS PRINCIPLE AND DESIGN CRITERIA OF atomizer

引用

中国有色金属学会会刊：英文版 1996年第3期6卷 108-112页

作者： Chen Shizhu Zhou NaiJun Yin Zhimin(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083) Department of Materials Science and Engineering Central South University of Technology Changsha 410083 China

ＦＬＵＩＤＫＩＮＥＴＩＣＳＰＲＩＮＣＩＰＬＥＡＮＤＤＥＳＩＧＮＣＲＩＴＥＲＩＡＯＦＡＴＯＭＩＺＥＲ￥ＣｈｅｎＳｈｉｚｈｕ；ＺｈｏｕＮａｉＪｕｎ；ＹｉｎＺｈｉｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎ... 详细信息

ＦＬＵＩＤＫＩＮＥＴＩＣＳＰＲＩＮＣＩＰＬＥＡＮＤＤＥＳＩＧＮＣＲＩＴＥＲＩＡＯＦＡＴＯＭＩＺＥＲ￥ＣｈｅｎＳｈｉｚｈｕ；ＺｈｏｕＮａｉＪｕｎ；ＹｉｎＺｈｉｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｒｉｎｇ，...

关键词： atomizer fluid medium fluid kinetics vorticit

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical simulation of droplet-formation in rotary atomizer

引用

Theoretical & Applied Mechanics Letters 2019年第3期9卷 202-205页

作者： Naoki Igari Takuro Iso Yu Nishio Seiichiro Izawa Yu Fukunishi Tohoku University

Numerical simulations of the liquid flow scattering from rotary atomizers are performed using an incompressible smoothed particle hydrodynamics (SPH) method. The influence of grooves at the edges of the atomizers on the formation of ligaments and droplets is investigated changing the numbers and shapes of the grooves. As a result, it is found that small droplets are likely to be generated when the number of grooves is large and the depth of grooves is deep. It is also found that the grooves work more effectively in bell-cup atomizers than in disk type atomizers.

关键词： Smoothed particle hydrodynamics (SPH) Rotary atomizer Grooves Droplet

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Computational Modelling of the Hydride Generation Reaction in a Tubular Reactor and Atomization in a Quartz Cell atomizer

引用

Journal of Analytical Sciences, Methods and Instrumentation 2012年第3期2卷 126-139页

作者： Wameath S. Abdul-Majeed William B. Zimmerman Department of Chemical and Biological Engineering The University of Sheffield Sheffield UK Department of Chemical and Biological Engineering The University of Sheffield Sheffield UK.

In this study, we present a model whereby the centre of the atomization channel is shown to be the optimal location for the spectrometric data acquisition in a quartz cell atomizer. The study aims to explore the hydride generation technique which is normally coupled with efficient thermal source to apply determination of heavy metals in water samples via spectrometric analysis. The arsenic hydride generation process and the atomization of the generated hydride in a quartz cell atomizer were studied analytically as model case studies. The hydride generation (HG) process was analyzed by adopting two hypotheses, the nascent hydrogen and formation of intermediate hydroboron species, where the results based on the second hypothesis are found to be more realistic for design purposes. Moreover, the release of the generated hydride from the liquid phase and their transport to the gas phase is simulated in a helical tubular section, in which the actual tubular section length required for separation is deduced. The analytical results have been verified experimentally by measuring the signal intensity for the free arsenic atoms against several reaction tube lengths, in which increasing the tubular section length from 12 cm to 100 cm results in signal amelioration by no more than 6.6%. Furthermore, the atomization of the hydride and the distribution of the generated free atoms are deduced in two configurations of tubular quartz atomizers. The results obtained from both studied cases illustrate that a high concentration of the free analyte atoms is generated in the first part of the atomization channel, saturates to a maximum in a position at the atomizer centre, and dissipates at the inside wall of the tubular atomizer before reaching the atomizer outlet edge, which is found to be in total agreement with the current understanding of atomization mechanism in tubular atomizer and emphasizes the fact that the centre of the quartz cell atomizer is the best location for the spectrom

关键词： Hydride Generation Process Tubular Reactor Quartz Cell atomizer Emission Spectroscopy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Study on the Performance of Two Drive Forms of Centrifugal atomizer 16th

The Study on the Performance of Two Drive Forms of Centrifug...

引用

The 16th International Conference on Fluid Dynamic and Mechanical & Electrical Control Engineering(FDMECE2012)

作者： Xincai Zhu Tengfei Hu Lei Guo Xiong Zhou Youqing Ding Xing Deng Chongqing University of Technology Chongqing University of Science & Technology

ISBN: (纸本)9783037855164

＜正＞High speed rotating centrifugal atomizer is the key part in the flue gas *** different driving form affects the atomizer’s stability of high speed movement,atomization effect and the running life *** on the high speed centrifugal atomizer,this paper investigated two driving forms of the atomizer,and compared their performance through the *** can be seen that the performance of direct couping drive is better than belt drive no matter in the atomization effect or the service life.

关键词： atomizer Belt Drive Direct Coupling Drive Performance

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Measuring Conditions for the Determination of Lead in Iron-Matrix Samples Using Graphite atomizers with/without a Platform in Graphite Furnace Atomic Absorption Spectrometry

引用

American Journal of Analytical Chemistry 2011年第6期2卷 710-717页

作者： Syun Morimoto Tetsuya Ashino Kazuaki Wagatsuma 不详

In graphite furnace atomic absorption spectrometry (GF-AAS), the atomization process of lead occurring in graphite atomizers with/without a platform plate was investigated when palladium was added to an iron-matrix sample solution containing trace amounts of lead. Absorption profiles of a lead line were meas- ured at various compositions of iron and palladium. Variations in the gas temperature were also estimated with the progress of atomization, by using a two-line method under the assumption of a Boltzmann distribu- tion. Each addition of iron and palladium increased the lead absorbance in both the atomizers, indicating that iron or palladium became an effective matrix modifier for the determination of lead. Especially, palladium played a significant role for controlling chemical species of lead at the charring stage in the platform-type atomizer, to change several chemical species to a single species and eventually to yield a dominant peak of the lead absorbance at the atomizing stage. Furthermore, the addition of palladium delayed the peak after the gas atmosphere in the atomizer was heated to a higher temperature. These phenomena would be because the temperature of the platform at the charring stage was elevated more slowly compared to that of the furnace wall, and also because a thermally-stable compound, such as a palladium-lead solid solution, was produced by their metallurgical reaction during heating of the charring stage. A platform-type atomizer with palladium as the matrix modifier is recommended for the determination of lead in GF-AAS. The optimum condition for this was obtained in a coexistence of 1.0 × 10–2 g/dm3 palladium, when the charring at 973 K and then the atomizing at 3073 K were conducted.

关键词： Graphite Furnace Atomic Absorption Spectrometry Platform atomizer Gas Temperature Matrix Modifier Lead Iron Palladium

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effects of different nozzle materials on atomization results via CFD simulation

引用

Chinese Journal of Chemical Engineering 2020年第2期28卷 362-368页

作者： Xiangyu Li Jianjun Du Licheng Wang Jiangli Fan Xiaojun Peng State Key Laboratory of Fine Chemicals Dalian University of Technology2 Linggong RoadDalian 116024China Research Institute of Dalian University of Technology in Shenzhen Gaoxin South fourth RoadNanshan DistrictShenzhen 518057China Dalian FISTA Specialized Chemistry Co.Ltd. 131 Guangxian RoadDalian 116023China

Spray drying,as a crucial operation in industrial production,converts solution to fine *** spray moiety directly affects the final particle morphology,size and *** with the experimental method,computational fluid dynamics(CFD)modeling is a powerful and convenient tool for simulating the spray *** on the verified CFD model,different materials of atomizer were simulated to investigate the effect on droplet size and distribution in this *** modeling result proved that the droplet size and distribution were influenced by the resistance coefficient of materials,wherein the Reynolds number could change the effect of roughness along with the change of mass flow rate on spray *** results in this work have implication for controlling droplet size through developing new spray nozzle with different materials or surface coating.

关键词： CFD modeling Spray process atomizer materials Droplet size Size distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：