Numerical and experimental investigation of the flow behavior of sand particles in core shooting process
Numerical and experimental investigation of the flow behavior of sand particles in core shooting process
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DOI：
10.1016/j.powtec.2017.01.091
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发表时间：
2017-04
影响因子：
5.2
通讯作者：
Chang-jiang Ni;Gao-chun Lu;T. Jing;Jun-jiao Wu
中科院分区：
文献类型：
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作者：
Chang-jiang Ni;Gao-chun Lu;T. Jing;Jun-jiao Wu
采用计算流体力学（CFD）模拟与实验相结合的方法，研究了岩心射孔过程中砂粒的流动特性。在CFD模拟中，采用了双流体模型（TFM）来描述岩心抽采过程的流动动力学，该模型结合了动-摩本构关系。进一步研究了湍流模型和边界条件对抽芯过程建模的影响。模拟结果表明，壁面边界条件对砂土流动行为有一定的敏感性，而层流模型与湍流模型的模拟结果无显著差异。利用高速摄影系统和压力测量系统进行了系统实验，充分验证了模型的有效性，仿真结果与实验结果吻合较好。在模拟和实验结果的基础上，分析了砂粒在岩心箱内的流动特性，讨论了喷嘴尺寸（D = 6、8、10、15 mm）和射孔压力（Pin= 0.3、0.4、0.5 MPa）对砂粒质量通量、喷嘴处砂体体积分数和砂速分布等流体动力特性的影响。
The flow behavior of sand particles during the core shooting process has been studied by combination of computational fluid dynamics (CFD) simulations and experiments. In the CFD simulations, a two-fluid model (TFM), in which a kinetic-frictional constitutive correlation is incorporated, has been applied to describe the flow dynamics of core shooting process. The influences of turbulence model and boundary conditions on the modeling of core shooting process are further investigated. The simulation results indicate that there are certain sensitivities to the wall boundary condition in the sand flow behavior while no significant difference is observed between the results of the laminar and turbulence models. Using high-speed photography system and pressure measuring system, systematic experiments have been carried out to fully validate the model and good agreement is obtained between simulations and experiments. Based on the simulation and experimental results, the flow behavior of sand particles in the core box is analyzed, and the effects of nozzle dimension (D = 6, 8, 10, 15 mm) and shooting pressure (Pin= 0.3, 0.4, 0.5 MPa) on the hydrodynamic properties such as sand particle mass flux, sand volume fraction at the nozzle and distribution of sand velocity are discussed.