检索结果-南通市图书馆

Two-Phase Flow Characteristics in a Coalescence-Dispersion Pulsed-Sieve-Plate Extraction Column

Chinese Journal of Chemical Engineering 2004年第1期12卷 1-6页

作者：唐晓津骆广生李洪波汪家鼎 The State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University Beijing 100084 China

A study on two-phase flow characteristics in a coalescence-dispersion pulsed-sieve-plate extraction column of 150mm in diameter was carried out with a working system of 30% tri-butyl-phosphate (TBP) (in kerosene)-nitric acid-water. The influence of operation conditions on the holdup of the dispersed phase was investigated. According to the analysis of the experimental data, there was a turning point on the curve of ln(Vs) versus ln(l-Φ) under certain pulse intensity. When the holdup is higher than the value at the turning point, the two-phase flow characteristics can be described with the modified Pratt's equation, otherwise a new relation in the form ofΦ=1/2.75uk(uc + 4ud) may be used, which is proposed by this study.

关键词： pulsed-sieve-plate column coalescence-dispersion hydrodynamics holdup

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

A Model of Turbulent-Laminar Gas-Liquid Stratified Flow

引用

Chinese Journal of Chemical Engineering 2001年第2期9卷 129-132页

作者：李卫东赵钦新李荣先清华大学北京 100084 西安交通大学陕西西安

The time-dependent liquid film thickness and pressure drop are measured by using parallel-wire conduc tance probes and capacitance differential-pressure transducer. A mathematical model with iterative procedure to calculate holdup and pressure drop in horizontal and inclined gas-liquid stratified flow is developed. The predictions agree well with over a hundred experimental data in 0.024 and 0.04 m diameter pipelines.

关键词： two-phase flow stratified flow holdup pressure drop

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

资产专用性、“敲竹杠”与新制度贸易经济学

引用

国际贸易研究 2010年第12期 4-8,40页

作者：汤吉军

新古典自由贸易经济学是以完全竞争市场为假设前提，其中一个重要的隐含前提是各类资产具有完全通用性，可以自由进入与退出市场或产业。然而，随着世界经济的发展，资产在国际间的流动逐渐成为国际贸易中不可忽略的一个重要组成部分，... 详细信息

新古典自由贸易经济学是以完全竞争市场为假设前提，其中一个重要的隐含前提是各类资产具有完全通用性，可以自由进入与退出市场或产业。然而，随着世界经济的发展，资产在国际间的流动逐渐成为国际贸易中不可忽略的一个重要组成部分，资产专用性对国际贸易和投资产生重要影响，它不仅会影响国际贸易的总量和产品构成，而且还会影响一国贸易格局和贸易政策的选择。如果一国进行了资产专用性投资，就会使其在贸易谈判中陷入进退两难困境，失去讨价还价的力量，并影响其在贸易利益上的分配格局，进而严重影响一国的贸易不公平结构。从资产专用性角度探讨新制度国际贸易经济学的合理性，由新古典国际贸易经济学走向新制度国际贸易经济学，更加具有现实性。为了摆脱这种被要挟和被控制的风险，除了企业自身治理结构外，还需要政府实行一定的保护主义政策。

关键词：资产专用性新古典经济学 “敲竹杠” 新制度贸易经济学 asset specificity neoclassical economics holdup new institutional trade economics

来源：人大复印报刊资料评论

在线全文

人大复印报刊资料

学校读者我要写书评

暂无评论

STUDY ON THE PERFORMANCE OF VERTICAL TUBULAR LEACHING REACTOR

引用

Chinese Journal of Chemical Engineering 1992年第2期 188-196页

作者：李宽宏陈晓祥 Chemical Engineering Research Centre East China Institute of Chemical Technology

Hydrodynamics in vertical tubular leaching reactor was studied in this work. Based on the observation of particle saltation in curved and square return bends, the inclined return bend was developed and examined. For the narrow and wide size distribution particle system, the method for calculating the particle holdup in upflow and downflow tubes was derived on the basis of generalized fluidization equation. The model of unit pressure drop was given and examined by experiments.

关键词： hydrodynamics holdup saltation pressure drop tubular leaching reactor

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

Bubble and Heat Transfer Phenomena in Viscous Slurry Bubble Column

引用

Advances in Chemical Engineering and Science 2014年第4期4卷 417-429页

作者： Hyo Sik Kim Jin Ho Kim Chan Gi Lee Suk Hwan Kang Kwang Jae Woo Ho Jin Jung Dong Wook Kim Plant Engineering Center Institute for Advanced Engineering (IAE) Gyongki-do Korea DAEWOONG E & S Daejeon Korea Department of Environmental Engineering Kongju National University Cheonan Korea

Heat transfer and bubble phenomena were investigated by adopting the drift flux model in a viscous slurry bubble column reactor (SBCR), having a diameter of 0.0508 m(ID) and height 1.5 m. The effects of superficial gas velocity (0.002 -0.164 m/s), solid concentration (0 - 20 wt%) and liquid viscosity (paraffin oil;16.9 mPa•s and squalane;25.9 mPa•s) on the gas holdup and heat transfer characteristics were examined. It was observed that the gas holdup increased with increasing superficial gas velocity (UG), but decreased with increasing solid concentration (SC) or slurry viscosity. The degree of non-uniformity in a SBCR could be determined by the modified drift flux model at the heterogeneous flow regime. The local heat transfer coefficient (h) between the immersed heater and the bed decreased with increasing liquid viscosity and SC, but it increased with increasing UG. The modified Nusselt number including the gas holdup and local heat transfer coefficient was well correlated in terms of dimensionless groups such as Reynolds and Prandtl numbers.

关键词： Gas holdup Slurry Bubble Column Heat Transfer Drift Flux Model

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 OF IDENTIFYING FLOW PATTERNS OF AIR-WATER TWO-PHASE FLOWS IN HORIZONTAL PIPES BASED ON THE DETECTED SIGNALS

THE STUDY OF IDENTIFYING FLOW PATTERNS OF AIR-WATER TWO-PHAS...

引用

多相流研究进展国际会议

作者： Min Wang Da Yu Jing GongInstitute of Petroleum and Gas Engineering Petroleum University Beijing. 102249 China

＜正＞ Accurately identifying flow patterns severely influence on choosing proper formulas to calculate in design, choice about equipment types and normally running and installing the piping etc. The methods on identifying flow patterns mainly include direct ways and indirect ways. The direct ones ascertain flow patterns according to the flow forms of the two-phase flow, and the indirect ones identify flow patterns according to the signal that can reflect the flow characteristics of two-phase flow. In the study the differentiate rule on flow patterns transition is gained combining average value analysis, mean square root analysis, time domain analysis, PDF and FFT of holdup with fractal dimension of pressure fluctuation.

关键词： Two-phase Flow holdup Flow Pattern Pressure Fluctuation.

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

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

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

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：