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

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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

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

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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

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Numerical simulation study on multiphase flow pattern of hydrate slurry

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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

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Numerical Study of Void Fraction Distribution Propagation in Gas-Liquid Two-Phase flow

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Tsinghua Science and Technology 2005年第3期10卷 398-403页

作者：杨健慧李青卢文强 Department of Physics Graduate School Chinese Academy of Sciences Beijing 100039 China Technical Institute of Physics and Chemistry Chinese Academy of Sciences P.O. Box 2711 Beijing 100080 China

A dynamic propagation model was developed for waves in two-phase flows by assuming that continuity waves and dynamic waves interact nonlinearly for certain flow conditions. The drift-flux model is solved with the one-dimensional continuity equation for gas-liquid two-phase flows as an initial-boundary value problem solved using the characteristic-curve method. The numerical results give the void fraction dis- tribution propagation in a gas-liquid two-phase flow which shows how the flow pattern transition occurs. The numerical simulations of different flow patterns show that the void fraction distribution propagation is deter- mined by the characteristics of the drift-flux between the liquid and gas flows and the void fraction range. flow pattern transitions begin around a void fraction of 0.27 and end around 0.58. flow pattern transitions do not occur for very high void concentrations.

关键词： void fraction distribution gas-liquid two-phase flow flow pattern transition

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