检索结果-内蒙古大学图书馆

A unified model to predict flow pattern transitions in horizontal and slightly inclined two-phase gas/shear-thinning fluid pipe flows

引用

INTERNATIONAL JOURNAL OF MULTIPHASE flow 2016年 84卷 279-291页

作者： Picchi, Davide Poesio, Pietro Univ Brescia Dipartimento Ingn Meccan & Ind Via Branze 38 I-25123 Brescia Italy

flow pattern transitions in two-phase gas/shear-thinning fluid pipe flows represent a key aspect during oil transportation and in chemical industry. In this paper a unified model to build a complete flow pattern map is proposed and models to predict flow patterns are provided. The transitions from stratified flow regime are investigates performing a linear stability and well-posedness analyses, and a non-linear stability analysis. The steady and fully developed two-fluid model for the annular flow is proposed and validated;the flow pattern transition from the annular flow is discussed considering, also, the structural stability. The transition to dispersed flow, the slug stability approach, and criteria to obtain the slug/plug and the bubbly/plug boundaries are considered. A sensitivity analysis on the effect of the rheology of the shear-thinning fluid on flow pattern boundaries is carried out and, then, the complete flow pattern maps are validated with data taken from the literature showing a good agreement. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Shear-thinning fluid flow pattern transition Non-linear stability Stratified flow Annular flow Dispersed flow

来源：评论

学校读者我要写书评

暂无评论

Characterization of flow pattern transitions for horizontal liquid-liquid pipe flows by using multi-scale distribution entropy in coupled 3D phase space

引用

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 2017年 469卷 136-147页

作者： Zhai, Lu-Sheng Zong, Yan-Bo Wang, Hong-Mei Yan, Cong Gao, Zhong-Ke Jin, Ning-De Tianjin Univ Sch Elect Engn & Automat Tianjin 300072 Peoples R China Sinopec Res Inst Petr Engn Beijing 100101 Peoples R China

Horizontal oil-water two-phase flows often exist in many industrial processes. Uncovering the dynamic mechanism of the flow pattern transition is of great significance for modeling the flow parameters. In this study we propose a method called multi-scale distribution entropy (MSDE) in a coupled 3D phase space, and use it to characterize the flow pattern transitions in horizontal oil-water two-phase flows. Firstly, the proposed MSDE is validated with Lorenz system and ARFIMA processes. Interestingly, it is found that the MSDE is dramatically associated with the cross-correlations of the coupled time series. Then, through conducting the experiment of horizontal oil-water two-phase flows, the upstream and downstream flow information is collected using a conductance cross-correlation velocity probe. The coupled cross-correlated signals are investigated using the MSDE method, and the results indicate that the MSDE is an effective tool uncovering the complex dynamic behaviors of flow pattern transitions. (C) 2016 Elsevier B.V. All rights reserved.

关键词： Horizontal oil-water two-phase flow flow pattern transition Coupled phase space Distribution entropy

来源：评论

学校读者我要写书评

暂无评论

Experimental and modeling investigation of zero net liquid flow in hilly terrain pipeline

引用

Petroleum Science 2025年

作者： Huang, Bo Xu, Qiang Chang, Ying-Jie Cao, Ye-Qi Yu, Hai-Yang Li, Yu-Wen Guo, Lie-Jin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi Xi'an 710049 China College of Petroleum Engineering Xi'an Shiyou University Shaanxi 710065 China

Hilly terrain pipeline is a common form of pipeline in oil and gas storage and transportation industry. Due to the hilly terrain influence, the liquid at the elbow of the gathering pipeline is easy to flow back and accumulate to form slug flow, so it is necessary to remove the accumulated liquid by gas purging. In this paper, experiment is carried out in hilly terrain pipelines. Three flow patterns of stratified flow, slug flow and stratified entrained flow are observed. The process of gas purging accumulated liquid is divided into four stages, namely liquid accumulation, liquid rising;continuous outflow and tail outflow. At the same time, the flow pattern maps of each stage are drawn. The pressure drop signal is analyzed in time domain and frequency domain, and the contour map of pressure drop distribution is drawn. It is found that the ratio of range to average value can well distinguish the occurrence range of each flow pattern. Based on visualization, the transition process of slug flow to stratified flow and stratified entrained flow is studied, and the transition boundary prediction model is established. An image processing method is proposed to convert the image signal into a similarity curve, and PSD analysis is performed to calculate the slug frequency. The normal distribution is used to fit the slug frequency, and the predicted correlation is in good agreement with the experimental data. © 2025 The Authors

关键词： flow pattern transition Hilly terrain pipeline Quantitative image processing Slug flow Zero net liquid flow

来源：评论

学校读者我要写书评

暂无评论

Numerical and experimental study on the falling film flow characteristics with the effect of co-current gas flow in hydrogen liquefaction process

引用

Petroleum Science 2024年第2期21卷 1369-1384页

作者： Chong-Zheng Sun Yu-Xing Li Hui Han Xiao-Yi Geng Xiao Lu College of Energy Storage Technology Shandong University of Science and TechnologyQingdao 266590ShandongChina College of Pipeline and Civil Engineering/Shandong Provincial Key Laboratory of Oil&Gas Storage and Transportation Safety China University of PetroleumQingdao 266580ShandongChina

Liquid hydrogen storage and transportation is an effective method for large-scale transportation and utilization of hydrogen energy. Revealing the flow mechanism of cryogenic working fluid is the key to optimize heat exchanger structure and hydrogen liquefaction process(LH2). The methods of cryogenic visualization experiment, theoretical analysis and numerical simulation are conducted to study the falling film flow characteristics with the effect of co-current gas flow in LH2spiral wound heat *** results show that the flow rate of mixed refrigerant has a great influence on liquid film spreading process, falling film flow pattern and heat transfer performance. The liquid film of LH2mixed refrigerant with column flow pattern can not uniformly and completely cover the tube wall surface. As liquid flow rate increases, the falling film flow pattern evolves into sheet-column flow and sheet flow, and liquid film completely covers the surface of tube wall. With the increase of shear effect of gas-phase mixed refrigerant in the same direction, the liquid film gradually becomes unstable, and the flow pattern eventually evolves into a mist flow.

关键词： Hydrogen liquefaction Spiral wound heat exchanger flow pattern transition Falling film flow

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation study on multiphase flow pattern of hydrate slurry

引用

Petroleum Science 2023年第6期20卷 3897-3917页

作者： Xiao-Fang Lv Feng Chen Jie Zhang Yang Liu Qian-Li Ma Hui Du Chuan-Shuo Wang Shi-Dong Zhou Bo-Hui Shi Shang-Fei Song Jing Gong Jiangsu Key Laboratory of Oil and Gas Storage&Transportation Technology Changzhou UniversityChangzhou213016JiangsuChina China Petroleum&Chemical Corporation Northwest Oilfield Branch Petroleum Engineering Technology Research InstituteUrumqi830011XinjiangChina Sinopec Shengli Oilﬁeld Company Dongying257001ShandongChina National Engineering Laboratory for Pipeline Safety/MOE Key Laboratory of Petroleum Engineering China University of Petroleum-Beijing102249BeijingChina

The research on the multiphase flow characteristics of hydrate slurry is the key to implementing the risk prevention and control technology of hydrate slurry in deep-water oil and gas mixed transportation *** paper established a geometric model based on the high-pressure hydrate slurry experimental *** model was used to carry out simulation research on the flow characteristics of gas-liquid-solid three-phase *** specific research is as follows:Firstly,the effects of factors such as slurry flow velocity,hydrate particle density,hydrate particle size,and hydrate volume fraction on the stratified smooth flow were specifically *** test obtained particle size has the most influence on the particle concentration *** slurry flow velocity is gradually increased based on stratified smooth *** flow patterns were observed and their characteristics were ***,increasing the slurry velocity to 2 m/s could achieve the slurry flow pattern of partial hydrate in the pipeline transition from stratified smooth flow to wavy *** the flow rate increases to 3 m/s,a violent wave forms throughout the entire *** on wave flow,as the velocity increased to 4 m/s,and the flow pattern changed to slug *** the particle concentration was below 10%,the increase of the concentration would aggravate the slug flow trend;if the particle concentration was above 10%,the increase of the concentration would weaken the slug flow trend,the increase of particle density and liquid viscosity would weaken the tendency of slug *** relationship between the pressure drop gradients of several different flow patterns is:slug flow>wave flow>stratified smooth flow.

关键词： Hydrate slurry Numerical simulation Multiphase flow flow field distribution flow pattern transition

来源：评论

学校读者我要写书评

暂无评论

A new method for identifying flow pattern of spouted fluidized bed by coupling Hilbert-Huang transform characteristics of differential pressure signals in different zones

引用

Particuology 2024年第6期89卷 67-78页

作者： Yongzhi Mei Yang Wang Lihui Zhang Feng Duan School of Energy and Environment Anhui University of TechnologyMaanshan243002China Wuhu Technology and Innovation Research Institute Wuhu241000China Wuhu Cigarette Factory of China Tobacco Anhui Industrial Co. Ldt.Wuhu241002China

On a cold spouted fluidized bed,this study compares the characteristic differences in intrinsic mode function(IMF)energy and Hilbert–Huang spectrum between the spout zone and annulus zone under different combinations of spouted gas and fluidized gas flow rates for five typical flow *** energy distribution characteristics under different flow patterns are also *** Hilbert–Huang spectrum and IMF energy of pressure difference signals exhibit distinct variations in different zones as the flow pattern ***,there exists a correlation between the energy in the middle-frequency range and the flow *** the K-means algorithm,the middle-frequency range energy of IMFs in the spout zone and annulus zone is subjected to clustering analysis,leading to the identification of partition boundaries for each flow *** on this,a flow pattern identification method of spouted fluidized bed coupled with middle-frequency range energy in spout zone and annulus zone is proposed,which has very high identification accuracy.

关键词： Spouted fluidized bed flow pattern Zoning signal flow pattern transition Hilbert-Huang transform

来源：评论

学校读者我要写书评

暂无评论

Experimental study on the effect of drag reducing polymer on flow patterns and drag reduction in a horizontal oil-water flow

引用

INTERNATIONAL JOURNAL OF HEAT AND FLUID flow 2012年 37卷 74-80页

作者： Yusuf, N. Al-Wahaibi, T. Al-Wahaibi, Y. Al-Ajmi, A. Al-Hashmi, A. R. Olawale, A. S. Mohammed, I. A. Sultan Qaboos Univ Dept Petr & Chem Engn Al Khoud 123 Oman Ahmadu Bello Univ Dept Chem Engn Zaria Nigeria

In this study, a HMW anionic co-polymer of 40:60 wt/wt NaAMPS/acrylamide was used as a drag reducing polymer (DRP) for oil-water flow in a horizontal 25.4 mm ID acrylic pipe. The effect of polymer concentration in the master solution and after injection in the main water stream, oil and water velocities, and pipe length on drag reduction (DR) was investigated. The injected polymer had a noticeable effect on flow patterns and their transitions. Stratified and dual continuous flows extended to higher superficial oil velocities while annular flow changed to dual continuous flow. The results showed that as low as 2 ppm polymer concentration was sufficient to create a significant drag reduction across the pipe. DR was found to increase with polymer concentration increased and reached maximum plateau value at around 10 ppm. The results showed that the drag reduction effect tends to increase as superficial water velocity increased and eventually reached a plateau at U-sw of around 1.3 m/s. At U-sw > 1.0 m/s, the drag reduction decreased as U-so increased while at lower water velocities, drag reduction is fluctuating with respect to U-so. A maximum DR of about 60% was achieved at U-so = 0.14 m/s while only 45% was obtained at U-so = 0.52 m/s. The effectiveness of the DRP was found to be independent of the polymer concentration in the master solution and to some extent pipe length. The friction factor correlation proposed by Al-Sarkhi et al. (2011) for horizontal flow of oil-water using DRPs was found to underpredict the present experimental pressure gradient data. (C) 2012 Elsevier Inc. All rights reserved.

关键词： Oil-water flow flow pattern map flow pattern transition Drag reducing polymer Drag reduction

来源：评论

学校读者我要写书评

暂无评论

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

引用

MICROGRAVITY SCIENCE AND TECHNOLOGY 2023年第5期35卷 1-8页

作者： Tao, Yuequn Liu, Qiusheng Qin, Jun Zhu, Zhiqiang Chinese Acad Sci Natl Micrograv Lab Inst Mech Beijing 100190 Peoples R China Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China

Thermocapillary convection of nanofluid with evaporating phase change interface occurs in a variety of industrial processes such as micro/nano fabrication, ink-jet printing, thin film coatings, etc. Previous studies have mostly focused on the phenomena of thermocapillary convection in pure fluids without phase change. This paper reports the first fundamental experimental work on the thermocapillary flow of a thin nanofluid layer under the effect of evaporation. This research focuses on the behavior of a volatile thin nanofluid layer in a rectangular test cell under the effects of horizontal temperature gradient. The buoyancy effect can be neglected inside this thin liquid layer as in microgravity conditions. HEE7200 and HFE7200-Al2O3 nanofluid are used as working fluids to analyze the effect of nanoparticle addition. The results indicate that the linear relationship between the thickness of the liquid layer and the duration of evaporation is not changed by nanoparticles. HFE7200-Al2O3 nanofluid always has a higher evaporation rate than its base fluid with the temperature ranging from 2.98 & DEG;C to 13.92 & DEG;C. The critical Marangoni number for the nanofluid is lower than that of the pure fluid, which indicates that the addition of nanoparticles promotes the flow pattern transition.

关键词： Thermocapillary flow Evaporation rate flow pattern transition Nanofluid

来源：评论

学校读者我要写书评

暂无评论

Vortex-induced interfacial waves in liquid-liquid flows across cylindrical bluff bodies of various sizes

引用

EUROPEAN JOURNAL OF MECHANICS B-FLUIDS 2019年 76卷 340-351页

作者： Abidin, Mohd Izzudin Izzat Zainal Park, Kyeong Hyeon Angeli, Panagiota UCL Dept Chem Engn ThAMeS Multiphase London WC1E 7E England Univ Malaya Dept Chem Engn Fac Engn Kuala Lumpur 50603 Malaysia

The use of transverse cylinders of various sizes for generating vortex-induced waves in stratified oil-water pipe flows is investigated in this work. From CFD simulations in single phase flows, cylinders with 2 mm and 8 mm in diameter were selected which are found to generate vortices with frequencies in the range of 1 to 100 Hz. The experimental work was conducted in a 8 m long acrylic test section with 37 mm internal diameter. High speed imaging was used to study the flow patterns and the interfacial wave characteristics while velocity fields and the characteristics of the vortices shed by the cylinders in the water phase were obtained with Particle Image Velocimetry. It was found that the vortex properties generated by different cylinder sizes are reflected on the interfacial wave characteristics. The frequencies of both the waves and the vortices agreed for all cases studied, while the wave amplitudes increased with increasing cylinder diameter. The Strouhal number for the 2 mm cylinder had the same value of 0.20 as in unbounded flows, while for the 8 mm cylinder and small distance from the wall, the Strouhal number was equal to 0.27. The presence of the transverse cylinders modified the two-phase flow pattern maps and reduced the transition from stratified to dispersed flows to lower mixture velocities compared to flows without cylinders. The transition boundaries were shifted further towards lower mixture velocity with increasing cylinder diameter. (C) 2019 Elsevier Masson SAS. All rights reserved.

关键词： oil-water flows Vortex-induced waves High speed imaging Strouhal number flow pattern transition

来源：评论

学校读者我要写书评

暂无评论

Effect of drag-reducing polymers on horizontal oil-water flows

引用

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 2007年第3-4期57卷 334-346页

作者： Al-Wahaibi, Talal Smith, Mujeeb Angeli, Panagiota UCL Dept Chem Engn London WC1E 7JE England Sultan Qaboos Univ Dept Petr & Chem Engn Al Khoud 123 Oman

The effect of a drag-reducing polymer (DRP) in the water phase during horizontal oil-water flow was investigated in a 14 mm ID acrylic pipe. Oil (5.5 mPa s, 828 kg/m(3)) and a co-polymer (Magnafloc 1011) of polyacrylamide and sodium acrylate were used. Two polymer concentrations were tested, 20 ppm and 50 ppm, made from a 1000 ppm master solution. The results showed a strong effect of DRP on flow patterns. The presence of DRP extended the region of stratified flow and delayed transition to slug flow. The addition of the polymer clearly damped interfacial waves. Annular flow changed in all cases investigated to stratified or dual continuous flow, while slug flow changed in most cases to stratified flow. In the cases where the slug and bubble flow patterns still appeared after the addition of the polymer, the oil slugs and bubbles were seen to flow closer together than in the flow without the polymer. The DRP caused a decrease in pressure gradient and a maximum drag reduction of about 50% was found when the polymer was introduced into annular flow. The height of the interface and the water hold up increased with DRP. There were no large differences on pressure gradient and hold up between the two DRP concentrations. Using a two-fluid model it was found that the addition of the polymer results in a decrease in both the interfacial and the water wall shear stresses. (c) 2006 Elsevier B.V. All rights reserved.

关键词： polymer horizontal oil-water flow drag reduction hold up flow pattern transition

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：