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Computational Analysis of Centrifugal Pump Delivering solid-liquid two-phase flow during Startup Period

Chinese Journal of Mechanical Engineering 2014年第1期27卷 178-185页

作者： ZHANG Yuliang LI Yi ZHU Zuchao CUI Baoling The State Key Lab of Fluid Power Transmission and Control Zhejiang University College of Mechanical Engineering Quzhou University The Province Key Lab of Fluid Transmission Technology Zhejiang Sci-Tech University

The transient behavior of centrifugal pumps during transient operating periods, such as startup and stopping, has drawn more and more attention recently because of urgent needs in engineering. Up to now, almost all the existing studies on this behavior are limited to using water as working fluid. The study on the transient behavior related to solid-liquid two-phase flow has not been seen yet. In order to explore the transient characteristics of a high specific-speed centrifugal pump during startup period delivering the pure water and solid-liquid two-phase flow, the transient flows inside the pump are numerically simulated using the dynamic mesh method. The variable rotational speed and flow rate with time obtained from experiment are best fitted as the function of time, and are written into computational fluid dynamics （CFD） code-FLUENT by using a user defined function. The predicted heads are compared with experimental results when pumping pure water. The results show that the difference in the transient performance during startup period is very obvious between water and solid-liquid two-phase flow during the later stage of startup process. Moreover, the time for the solid-liquid two-phase flow to achieve a stable condition is longer than that for water. The solid-liquid two-phase flow results in a higher impeller shaft power, a larger dynamic reaction force, a more violent fluctuation in pressure and a reduced stable pressure rise comparing with water. The research may be useful to tmderstanding on the transient behavior of a centrifugal pump under a solid-liquid two-phase flow during startup period.

关键词： centrifugal pump solid-liquid two-phase flow startup transient performance

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Influence on the solid−liquid two-phase flow from Cross-Section Area of Slurry Pumps for Deep-Sea Mining

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China Ocean Engineering 2022年第3期36卷 439-450页

作者： WANG Run-kun ZHU Zu-chao SU Xiang-hui TANG Da-sheng JIN Xing Maciej GRUSZCZYNSKI The Province Key Lab of Fluid Transmission Technology Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Deep Sea Mineral Resources Development and Utilization Changsha Institute of Mining and MetallurgyChangsha 410000China Wroclaw University of Environmental and Life Sciences Wroclaw 52-124Poland

To explore the mechanism of solid-liquid two-phase flow in deep-sea mining pumps,this paper investigates the influences of the impeller cross-section area on the multi-phase flow in the slurry *** and numerical results are presented for two-phase flow in four impellers with different cross-section *** show that the degree of vortex strength and the passing capacity of particles increase as the cross-section area of the *** addition,the correlations between the two-phase flow and cross-section area have been revealed by a mathematical model taking the force of the flow field into *** simulation results confirm the theoretical analysis,while the experimental pump performances validate the numerical *** influence of the cross-section area on two-phase flow and pump performance could provide theoretical support for the design of high-performance deep-sea mining slurry pumps.

关键词： deep-sea mining slurry pump CFD-DEM solid-liquid two-phase flow Rossby number

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Estimation of solid concentration in solid-liquid two-phase flow in horizontal pipeline using inverse-problem approach

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Particuology 2022年第3期20卷 1-13页

作者： Ji Zhang Han Yuan Ning Mei Zhe Yan Marine Engineering College of EngineeringOcean University of ChinaQingdao 266100China Offshore Engineering Department of CivilEnvironmental and MiningUniversity of Western Australia35 Stirling HwyCrawleyWA 6009Australia Power Engineering and Engineering Thermophysics School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this study,an inverse-problem method was applied to estimate the solid concentration in a solid-liquid two-phase *** algebraic slip mixture model was introduced to solve the forward problem of solid-liquid convective heat *** time-average conservation equations of mass,momentum,energy,as well as the volume fraction equation were computed in a computational fluid dynamics(CFD)*** solid concentration in the CFD model was controlled using an external program that included the inversion iteration,and an optimal estimation was performed via experimental *** using a fly-ash-water mixture and sand-water mixture with different solid concentrations in a horizontal pipeline were conducted to verify the accuracy of the inverse-problem *** estimated results were rectified using a method based on the relationship between the estimated results and estimation error;consequently,the accuracy of the corrected inversion results improved *** a verification through experiments,the inverse-problem method was concluded to be feasible for predicting the solid concentration,as the estimation error of the corrected results was within 7%for all experimental samples for a solid concentration of less than 50%.The inverse-problem method is expected to provide accurate predictions of the solid concentration in solid-liquid two-phase flow systems.

关键词： solid-liquid two-phase flow solid concentration estimation Coupling calculation Inverse heat transfer problem Algebraic slip mixture model

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Numerical simulation of predicting and reducing solid particle erosion of solid-liquid two-phase flow in a choke

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Petroleum Science 2009年第1期6卷 91-97页

作者： Li Guomei Wang Yueshe He Renyang Cao Xuewen Lin Changzhi Meng Tao State Key Laboratory of Multiphase flow in Power Engineering Xi＇an Jiaotong University Xi＇an Shaanxi 710049 China China Special Equipment Inspection and Research Institute Beijing 100013 China School of Transport ＆ Storage and Civil Engineering China University of Petroleum Qingdao Shandong 266555 China Petroleum Exploration and Production Research Institute Sinopec Beijing 100083 China

Chokes are one of the most important components of downhole flow-control equipment. The particle erosion mathematical model, which considers particle-particle interaction, was established and used to simulate solid particle movement as well as particle erosion characteristics of the solid-liquid two-phase flow in a choke. The corresponding erosion reduction approach by setting ribs on the inner wall of the choke was advanced. This mathematical model includes three parts： the flow field simulation of the continuous carrier fluid by an Eulerian approach, the particle interaction simulation using the discrete particle hard sphere model by a Lagrangian approach and calculation of erosion rate using semiempirical correlations. The results show that particles accumulated in a narrow region from inlet to outlet of the choke and the dominating factor affecting particle motion is the fluid drag force. As a result, the optimization of rib geometrical parameters indicates that good anti-erosion performance can be achieved by four ribs, each of them with a height （H） of 3 mm and a width （B） of 5 mm equaling the interval between ribs （L）.

关键词： solid-liquid two-phase flow discrete particle hard sphere model choke erosion rate antierosion numerical simulation

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Numerical simulation and analysis of solid-liquid two-phase threedimensional unsteady flow in centrifugal slurry pump

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Journal of Central South University 2015年第8期22卷 3008-3016页

作者：吴波汪西力 LIU Hui 徐海良 School of Mechanical and Electrical Engineering Central South University Department of Computer Science Missouri State University

Based on RNG k-ε turbulence model and sliding grid technique, solid-liquid two-phase three-dimensional(3-D) unsteady turbulence of full passage in slurry pump was simulated by means of Fluent software. The effects of unsteady flow characteristics on solid-liquid two-phase flow and pump performance were researched under design condition. The results show that clocking effect has a significant influence on the flow in pump, and the fluctuation of flow velocity and pressure is obvious, particularly near the volute tongue, at the position of small sections of volute and within diffuser. Clocking effect has a more influence on liquid-phase than on solid-phase, and the wake-jet structure of relative velocity of solid-phase is less obvious than liquid-phase near the volute tongue and the impeller passage outlet. The fluctuation of relative velocity of solid-phase flow is 7.6% smaller than liquid-phase flow at the impeller outlet on circular path. Head and radial forces of the impeller are 8.1% and 85.7% of fluctuation, respectively. The results provide a theoretical basis for further research for turbulence, improving efficient, reducing the hydraulic losses and wear. Finally, field tests were carried out to verify the operation and wear of slurry pump.

关键词： slurry pump solid-liquid two-phase flow unsteady flow 3-D full passage numerical simulation

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FORCES ON PARTICLES AND THEIR EFFECTS ON VERTICAL SEDIMENT SORTING IN solid-liquid two-phase flowS

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International Journal of Sediment Research 2001年第2期16卷 128-138页

作者： NI Jinren1,2 and MENG Xiaogang1,2 1,2 Center for Environmental Sciences, Peking University, Beijing 100084, China 1,2 The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871. Center for Environmental Sciences Peking UniversityBeijing100084China The Key Laboratory of Water and Sediment Sciences Ministry of Education Beijing 100871

Vertical motion of particles was simulated by the Lagrangian method in one-dimensional solid-liquid two-phase flow. The conventional equation was modified by inserting a particle-particle interaction term, which was identified by Bagnold's experimental results. Effects of various forces have been examined under different particle concentrations. The results showed that the vertical sorting patterns are primarily determined by the joint action of inter-particle force and effective gravitational force, whereas the pace towards the steady sorting pattern was affected by Basset force and additional mass force.

关键词： Force Vertical sorting solid-liquid two-phase flow

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Analysis of influencing factors on suction capacity in seabed natural gas hydrate by cutter-suction exploitation

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Journal of Central South University 2018年第12期25卷 2883-2895页

作者： XU Hai-liang KONG Wei-yang HU Wen-gang School of Mechanical and Electrical Engineering Central South University

The mathematical and simulation models of working head in the deep-sea working environment were built to analyze the effects of cutter-suction flow,cutter-head rotating speed,cutting depth and suction port position on the cutter-suction *** efficiency of the cutter-suction is analyzed based on the analysis of the variation law of the solid-phase volume fraction of the flow field,the variation law of the velocity distribution in the flow field and the distribution law of the solid-phase *** results show that the increase of cutter-suction flow can significantly improve the cutter-suction efficiency when it is less than1000m3/***,when it is more than1000m3/h,it is *** the cutter-head rotate speed is within the range of10–25r/min,the cutter-suction efficiency stabilizes at about95%.While the speed is greater than25r/min,the cutter-suction efficiency decreases sharply with the increase of cutter-head rotate *** the increase of cutting depth,the cutter-suction efficiency first increases and then remains stable and finally *** cutter-suction efficiency remains at about94%when the suction port position deviation ranges from0°to30°,but it has a sharply reduction when the deviation angle is more than30°.

关键词： seabed natural gas hydrate working head solid-liquid two-phase flow cutter-suction capacity influencing factor

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Effect of particle motion on the hydraulic collection of coarse spherical particles

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Acta Mechanica Sinica 2020年第1期36卷 72-81页

作者： Yuxiang Chen Hong Xiong Hui Cheng Chunliang Yu Jiahua Xie Institute of Deep-sea Science and Engineering Chinese Academy of SciencesSanya572000China

Deep-sea mining,through which shattered coarse solid mineral resources are hydraulically collected and transported,is a promising solution for problems associated with resource *** study reports some interesting phenomena observed in a series of upward pumping experiments conducted on a coarse sphere with a 2-cm *** sphere was hydraulically lifted using a vertical pipe with a 5-cm radius suspended above the ***,the tangential motion benefited the *** discrete element method-computational fluid dynamics was used to investigate the collection mechanism;this method was used to simulate the collecting processes of the sphere under different initial motion *** simulated results agreed well with the experimental *** vortices over the sphere induced by its motion coupled with the main stream mainly provide sufficient lift force to raise the sphere.

关键词： solid-liquid two-phase flow Deep-sea mining CFD-DEM

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EFFECT OF DRILLPIPE ROTATION ON BOREHOLE CLEANING FOR EXTENDED REACH WELL

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Journal of Hydrodynamics 2009年第3期21卷 366-372页

作者： WANG Zhi-ming GUO Xiao-le LI Ming HONG Yu-kui College of Oil and Gas Engineering China University of Petroleum Beijing 102249 China

Wellbore cleaning is a key technology for the Extended Reach Drilling （ERD）. The success of drilling extended reach wells depends directly upon the quality of wellbore cleaning. The rotation of the drillpipe, and hydraulic and rheological parameters, are the key factors for wellbore cleaning. In this study, Computational Fluid Dynamics （CFD） is applied to simulate solid-liquid two-phase flows in wellbore annulus. The annual flow field with the presence of drillpipe rotation is described through analyzing various rotation conditions. The results indicate that the quasi-spiral flow is the main flow pattern for liquid-solid transport in the horizontal annulus. The influence of rotation on the cuttings transport is also investigated, as the rotation of drillpipe increases the disturbance of liquid to solid in annulus. As a result, the solid flow becomes favorable and the solid volume is reduced. Comparisons with previously published results are also performed to prove the importance of drillpipe rotation in the wellbore clearing for the ERD.

关键词： Extended Reach Drilling (ERD) borehole cleaning solid-liquid two-phase flow drillpipe rotation simulation spiral flow

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Numerical Simulation of Proppant Dynamics in a Rough Inclined Fracture

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Fluid Dynamics & Materials Processing 2022年第2期18卷 431-447页

作者： Tiankui Guo Zhilin Luo Shanbo Mou Ming Chen Yuanzhi Gong Jianhua Qin College of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China Xinjiang Zhengtong Petroleum and Natural Gas Co. Ltd.Karamay834000China Dongxin Oil Production Plant Shengli Oil Field BranchSINOPECDongying257100China Research Institute of Exploration and Development Xinjiang Oilfield CompanyKaramay457001China

Although the dynamics of proppant(small ceramic balls used to prevent opened fractures from closing on the release of pressure)have been the subject of several numerical studies over recent years,large-scale inclined fractures exist in unconventional reservoirs for which relevant information is still *** the present study,this problem is investigated numerically considering the influence of several relevant factors such as the fracture roughness,inclination,the proppant particle size,the injection rate and the fluid *** results show that a rough wall enables the proppant to travel farther and cover larger *** inclination angle has little effect on the dune but a significant influence on the suspension *** area of this zone increases with a decrease in the inclination angle,and its value for an inclination of 15°is 20 times that at 90°.Small particle size,high injection rate,and high fracturing fluid viscosity have a beneficial influence on proppant transport;vice versa they hinder settling phenomena.

关键词： Rough wall surface inclined fracture proppant transport and placement solid-liquid two-phase flow computational fluid dynamics

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