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Experimental investigation of particle-induced pressure loss in solid–liquid lifting pipe

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Journal of Central South University 2017年第9期24卷 2114-2120页

作者：宋跃文朱小军孙志强唐达生 School of Energy Science and Engineering Central South University State Key Laboratory of the Exploration and Utilization of Deep-sea Mineral Resources(Changsha Research Institute of Mining and Metallurgy Co.Ltd.)

In order to investigate the characteristics of particle-induced pressure loss in the solid–liquid lifting pipe,a series of experiments were conducted in 200 mm diameter lifting *** manganese nodules with five different mean diameters of10 mm,20 mm,30 mm,40 mm and 50 mm were used,both in isolation and a combination in equal fraction by *** flow velocities in the lifting pipe ranged from 0.12 m/s to 1.61 m/s,and the mass of particles employed was 10 kg for each particle *** regimes,wavy bed,partly fluidization,and fully fluidization,were observed over the flow *** solid–liquid pressure drop data were measured by differential pressure transmitter,and pressure drop caused by the solid particles was calculated and *** results show that the evolutions of the pressure loss due to solid particles are relevant to the solid–liquid flow regimes,and they are distinctly influenced by fluid velocity and particle size.

关键词： lifting pipe pressure loss simulation manganese nodules flow regimes

EXPERIMENTAL STUDY AND MODELING OF pressure loss FOR FOAM-CUTTINGS MIXTURE FLOW IN HORIZONTAL PIPE

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Journal of Hydrodynamics 2011年第4期23卷 431-438页

作者： AMNA Gumati HIROSHI Takahshi Graduate School of Environmental Studies Tohoku University

In this study, we first sought to elucidate foam rheology to describe foam flow behavior, and then to experimentally investigate the pressure losses for both foam and foam-cuttings flow in a horizontal pipe by considering both varied foam qualities of 80%, 85% and 90% and foam velocities. Also, a two-layer numerical model to predict pressure loss was developed based on experimental observations of cuttings behavior. Results show that the foam behaves like a power-law fluid. Furthermore, and the pressure loss significantly increases as foam velocity increases, while the delivered cuttings concentration dramatically decreases. Moreover, results indicate that both the pressure loss and the delivered cuttings concentration increase with foam quality. Comparisons between the experimental results and numerical model predictions show satisfactory agreement.

关键词： foam rheology pressure loss horizontal pipe cuttings concentration two-layer model

Numerical Characterization of the Annular Flow Behavior and pressure loss in Deepwater Drilling Riser

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Computer Modeling in Engineering & Sciences 2020年第8期124卷 561-572页

作者： Chengwen Liu Lin Zhu Xingru Wu Jian Liang Zhaomin Li School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China Mewbourne School of Petroleum&Geological Engineering University of OklahomaOK73019USA

In drilling a deepwater well,the mud density window is narrow,which needs a precise pressure control to drill the well to its designed ***,an accurate characterization of annular flow between the drilling riser and drilling string is critical in well control and drilling *** other factors influencing the change of drilling pressure that should be but have not been studied *** used numerical method to simulate the process of drill string rotation and vibration in the riser to show that the rotation and transverse vibration of drill string can increase the axial velocity in the annulus,which results in the improvement of the flow field in the annulus,and the effect on pressure loss and its fluctuation *** addition,there are also multiple secondary flow vortices in the riser annulus under certain eccentricity conditions,which is different from the phenomenon in an ordinary *** findings of this research are critical in safely controlling well drilling operation in the deepwater environment.

关键词： Deepwater drilling riser drill string movement pressure loss powerlaw fluid numerical simulation

Prediction of Cuttings-Induced Annular-pressure loss in Extended-Reach Wells

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Fluid Dynamics & Materials Processing 2023年第11期19卷 2877-2890页

作者： Long Wang Qingyun Shen Gui Wang Key Laboratory of Enhanced Oil Recovery in Fracture-Vug Reservoir SINOPECUrumuqi830011China State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China

Drill cuttings are broken bits of solid material removed from a borehole drilled by rotary,percussion,or auger methods and brought to the surface in the drilling *** these cuttings enter the annulus,they have an effect on the drillingfluid rheology and density,which is,in general,quite difficult to *** introducing an empirical correlation for the rheological properties of cuttings-laden drillingfluids,this study proposes a pres-sure-loss prediction method for an extended-reach well(ERW).After verifying the accuracy of this method,a case study is considered and a sensitivity analysis is conducted assuming a yield-power *** results show that an increased concentration of cuttings in the annulus contributes to an increased annular pressure ***-pared to their effect on the drillingfluid density,cuttings have a greater impact on the drillingfluid rheology.A larger rate of penetration contributes to an increased annular pressure *** higher drillingfluidflow rates,the annular pressure lossfirst decreases and then it *** addition,the annular pressure loss becomes high-er as the cuttings’particle size decreases and the cuttings’concentration grows.

关键词： pressure loss cuttings extended-reach well yield-power law model drillingfluid

Numerical simulation investigation on pressure loss of diffusion tank of axial main fan

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Journal of Coal Science & Engineering(China) 2011年第4期17卷 447-449页

作者： WANG Hai-qiao ZOU Zu-yun CHEN Shi-qiang CHEN Chong-xin School of Energy ＆ Safety Engineering Hunan University of Science and Technology Xiangtan 411201 China Hunan Provincial Engineering Techniques Research Center of Mine Ventilation ＆ Dedusting Equipment Xiangtan 411201 China

Based on the engineering application, the angle range of rectifying airflow unit attaching diffusion tank is from 2.5° to 7.5°. In the range of average inlet velocity of 25.0 m/s to 55.0 m/s of diffusion tank, numerical simulations of diffusion tank were done. The results of numerical simulations of diffusion tank are shown as follows： ③ In cases of the inlet velocity range from 25.0 m/s to 55.0 m/s, and the angle range of rectifying airflow unit from 2.5° to 7.5°, the average value of pressure losses decreases to the minimum when the angle is 4.5°.② In cases of the inlet velocity of 35.0 m/s, the pressure loss of diffusion tank decreases to the minimum when the angle of rectifying airflow unit is 5.5°. ③ As far as there are different angles of rectifying airflow unit, pressure loss increases gradually along with the addition of inlet velocity.

关键词： diffusion tank angle of rectifying airflow unit pressure loss

Analysis of Gas Flow Rate and pressure loss of Medical Mask Differential pressure Tester

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Journal of Clinical and Nursing Research 2022年第4期6卷 120-127页

作者： Zechen Lin Qing Zhang Jianjun Sun Xiujun Yao Shandong Institute of Medical Device and Pharmaceutical Packaging Inspection Jinan 250101China NMPA Key Laboratory for Quality Evaluation of Medical Materials and Biological Protective Devices Jinan 250101China

The objective of this study is to find a suitable method to overcome the pressure loss problem in the gas pipe during the gas exchange detection of medical *** on the European Standards EN 14683,the parameters of a medical mask differential pressure tester were selected,subsequently two schemes of gas pipe layouts were designed,including four kinds of pipe diameter which are 4,5,6.5,and 8mm ***,the models of each scheme were established and imported into Fluent,and the relevant parameters were set for *** data analysis,the results showed that among the four different pipe diameters,the pressure loss of 8mm diameter of the pipe was lower in both the schemes,additionally the pressure loss of the second scheme(the gas pipe was short and smooth)was lower under the same pipe *** the flow rate of v=8L/min,the pressure loss from the inlet to the measurement point is less than 200Pa,and the estimated measurement error is less than 1.5%.In conclusion,shortening the length of the pipe,and increasing the diameter of the pipe can reduce the gas pressure loss,subsequently improve the measurement accuracy of the medical mask differential pressure tester.

关键词： Medical mask Differential pressure Flow rate pressure loss Fluid simulation

Modeling and Prediction of pressure loss in Dilute Pneumatic Conveying System with 90° Bend

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Modeling and Prediction of Pressure Loss in Dilute Pneumatic...

EFFECT OF DUMP GAP ON TOTAL pressure loss IN DUMP DIFFUSER

2013年中国智能自动化学术会议

作者： Chao Wang Yakun Zhao Hongbing Ding School of Electrical Engineering and Automation Tianjin University

Dilute gas-solid flow exits widely in industrial applications and nature *** is of great value to estimate pressure loss during *** of the complex mechanism in gas-solid flow,accurate estimation of pressure loss can hardly be *** on the experimental condition in Tianjin University,a Computational Fluid Dynamics(CFD) model has been built,considering different states of motion during collisions between wall and particles with different *** model has been validated with experiment data and an automatic modeling system has been *** paper has engaged in studying pressure loss in 90°bend with different curative radius.

关键词： Dilute gas-solid flow pressure loss Computational fluid dynamics 90°bend

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Transactions of Nanjing University of Aeronautics and Astronautics 2002年第2期19卷 157-160页

作者：何小民毛军逵谈浩元南京航空航天大学能源与动力学院南京210016

The dump diffuser is an important component in advanced annular combustor, and its performance affects greatly the fluid field and pressure loss of the combustor. This paper presents the characteristics of the total pressure loss. Experiments and numerical simulations, keeping the inlet March number of prediffuser constant ( Ma =0 20), are carried out to obtain the regularity of the total pressure loss. It varies with the relative dump gap ( δ =1 2～3 0)by changing the position of prediffuser and combustor liner, respectively. Research shows that there exists the minimum total pressure loss ( σ *=1 6%～1 75%) when relative dump gap δ is about 1 8.

关键词： dump diffuser relative dump gap pressure loss

The numerical simulation of a new double swirl static mixer for gas reactants mixing

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2438-2446页

作者： Zhuokai Zhuang Jingtian Yan Chenglang Sun Haiqiang Wang Yuejun Wang Zhongbiao Wu Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental&Resources ScienceZhejiang UniversityHangzhou310058China Zhejiang Provincial Engineering Research Centre of Industrial Boiler&Furnace Flue Gas Pollution Control Hangzhou 310058China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China Zhejiang Tianlan Environmental Protection Technology Co.Ltd Hangzhou 311202China

For the nitrogen oxide removal processes,high performance gas mixer is deeply needed for the injection of NH3 or *** this study,a new type of double swirl static mixer in gas mixing was investigated using computational fluid dynamics(CFD).The results obtained using Particle Image Velocimetry(PIV)correlated well with the results obtained from *** comparisons in pressure loss between the experimental results and the simulation results showed that the model was suitable and accurate for the simulation of the static *** process conditions and design were *** L/D equaled 4,coefficient of variation(COV)waspressure loss,the inner connector is important in the design of the static *** nozzle length should be set at 4 *** both COV and pressure loss into consideration,the optimal oblique degree is *** averaged kinetic energy changed according to process conditions and *** new static mixer resulted in improved mixing performance in a more compact *** new static mixer is more energy efficient compared with other SV static ***,the double swirl static mixer is promising in gas mixing.

关键词： CFD PIV Gas mixing Double swirl static mixer pressure loss