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experimental and Numerical Analysis of Particle Migration and Patterning Behavior in a Gravel Pack

Fluid Dynamics & Materials Processing 2023年第4期19卷 911-928页

作者： Bobo Luo Yunbin Xiong Zhuoyi Li Zhanqing Qu Fenggang Liu Tiankui Guo Zugui Yang Yina Shi Exploration and Development Research Institute Zhongyuan Oilfield CompanySINOPECPuyangChina The University of Manchester ManchesterUK College of Petroleum Engineering China University of Petroleum(East China)QingdaoChina

Due to its long lifespan and high sand-removal efficiency,gravel packing is one of the most applied sand control methods during the recovery of reservoirs with sanding problems.The blockage and retention of injected sand in a gravel pack is a complex process affected by multiple mechanisms.The majority of existing studies based on the phenomenological deep bed filtration(DBF)theory focused on the gravel pack’s overall permeability damage and failed to obtain the inner-pore particle distribution pattern.In this work,experiments and simulations were carried out to reveal the particle distribution in a gravel pack during flooding.In particular,through real-time monitoring of particle migration,the penetration depth and distribution pattern of invaded particles with different gravel-sand particle ratios,fluid viscosities and injection rates could be determined.By simplifying each unit bed element(UBE)into a pore-throat structure with four tunnels(two horizontals for discharge and two verticals for sedimentation),a new network simulation method,which combines deep bed filtration with a particle trajectory model,was implemented.Cross comparison of experimental and numerical results demonstrates the validity and accuracy of the model.

关键词： Gravel pack sand control deep bed filtration visual experiment particle trajectory

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experimental and Numerical Analysis of the Influence ofMicrochannel Size and Structure on Boiling Heat Transfer

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Computer Modeling in Engineering & Sciences 2023年第9期136卷 3061-3082页

作者： Ningbo Guo Xianming Gao Duanling Li Jixing Zhang Penghui Yin Mengyi Hua School of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyXi’an710021China

Computational fluid dynamics was used and a numerical simulation analysis of boiling heat transfer in microchannels with three depths and three cross-sectional profiles was conducted.The heat transfer coefficient and bubble generation process of three microchannel structures with a width of 80μm and a depth of 40,60,and 80μm were compared during the boiling process,and the factors influencing bubble generation were studied.A visual test bench was built,and test substrates of different sizes were prepared using a micro-nano laser.During the test,the behavior characteristics of the bubbles on the boiling surface and the temperature change of the heated wall were collected with a high-speed camera and a temperature sensor.It was found that the microchannel with a depth of 80μm had the largest heat transfer coefficient and shortest bubble growth period,the rectangular channel had a larger peak heat transfer coefficient and a lower frequency of bubble occurrence,while the V-shaped channel had the shortest growth period,i.e.,the highest frequency of bubble occurrence,but its heat transfer coefficient was smaller than that of the rectangular channel.

关键词： Microchannel boiling heat transfer bubble numerical simulation visual experiment

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FRACTAL CHARACTERISTICS OF AERODYNAMIC FIELD AT OUTLET OF LOW-NO_x COAXIAL SWIRLING BURNER

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Journal of Hydrodynamics 2004年第1期16卷 67-73页

作者： WUJiang TIANFeng-guo ZHANGMing-chuan SONGYu-bao GAOMao YINBin SchoolofMechanicalandPowerEngineering ShanghaiJiaotongUniversityShanghai200240China／DepartmentofPowerEngineeringShanghaiUniversityofElectricPowerShanghai200090China SchoolofMechanicalandPowerEngineering ShanghaiJiaotongUniversityShanghai200240China

The primary wind of a low-NO_x coaxial swirling burner was visualized byusing glycol as smog tracer. The information of the visual flow field was input into a computerthrough image-capturing card with CCD camera as the image-capturing element. The boundary of thevisual zone, i. e. , the interface of the primary wind and secondary wind was obtained by imageprocessing. The fractal dimension (FD) of the boundary was examined and found to vary from 1. 10 to1. 40 with S_1, S_2 and ζ_1 . It is concluded that when FD is small, the complex level of theinterface is low, and mixture between the primary and secondary wind is weak near the exit of theburner at the initial phase of combustion resulting in stratified flow; when FD is big, mixturebecomes strong near the exit of the burner. It is showed that the flow with FD ranging from 1.10 to1. 20 is stratified flow, which is benefical to reduce NO_x yield and the flow with FD from 1. 25 to1. 40 is mixed flow, producing much NO_x. The mechanism of the forming of stratified flow and mixedflow was theoretically analyzed. The corresponding S_1 , S_2 and ζ_1 of these flows were given.

关键词： low-NO_x burner aerodynamic field visual experiment image processing fractal characteristics stratified flow

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experimental study on visualization of the flow field in microtube

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Science China Technological Sciences 2005年第5期 43-51页

作者： LIU Zhigang & ZHAO Yaohua Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China

An experimental study was conducted to visualize the flow field and confirm the transitional Reynolds number from laminar to turbulent flow, as distilled water flows through quartz glass microtubes with inner diameter 315 and 520 μm. With gentian violet as colorant, the flow field pictures in the microtube, and therefore, is shot by a CCD camera with a microscope at different Reynolds numbers. Pressure drop data were also used to characterize the friction factor for those microtubes in the Reynolds number range of 200―2300. The experimental results clearly showed that the flow in the microtube was the laminar state and the friction factors agreed well with the Poiseuille equations when the Reynolds number was low. As the Reynolds number was larger than 1200 and 1500 for the microtube with inner diameter 315 and 520 μm, respectively, the friction factor departed from the classical laminar solution due to the earlier transition from laminar to turbulent flow. The flow turned into full turbulent when the Reynolds number reached 1500―1800.

关键词： visual experiment microtube microscale flow friction factor turbulent transition.

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