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| 1 | Investigation of erosion behavior of 304 stainless steel under solid–liquid jet flow impinging at 30°显示文摘This work carried out liquid-solid two-phase jet experiments and simulations to study the erosion behavior of 304 stainless steel at 30° impingement.The single-phase impinging jet was simulated using dense grid by one-way coupling of solid phase due to its dilute distribution.The simulation results agreed well with experiments.It was found that after impinging particle attrition occurred and particles became round with decreasing length-ratio and particle breakage occurred along the 'long' direction.Both experiment and simulations found that the erosion generated on the sample could be divided into three regions that were nominated as stagnant region,cutting transition region and wall jet region.Most particle-wall impacts were found to occur in the cutting transition region and the wall jet region.In the cutting transition region,holes and lip-shaped hogbacks were generated in the same direction as the flow imping.In the wall jet region,furrows and grooves were generated.The averaged grooves depth tended to become constant with the progress of impinging and reach the steady state of erosion in the end.In addition,it was found that impinging effect increased erosion and anti-wear rate. | Yan-Lin Zhao Chun-Yan Tang Jun Yao Zi-Hua Zeng Shi-Gang Dong | 2020 | Petroleum Science2020，17，4： | 6 |
| 2 | 球型聚丙烯颗粒振动带电特性影响实验研究显示文摘为研究化工物料颗粒在振动过程中带电特性影响因素及影响规律,采用球形聚丙烯(PP)单/多颗粒在筛分仪内振动带电方式,分别在不同筛分仪振荡幅度、振荡时间、环境湿度以及不同PP颗粒粒径、振动颗粒总数目的条件下,对PP颗粒带电速率及带电饱和量进行测试。结果表明:振荡幅度、振荡时间、环境湿度及颗粒粒径等因素对PP单颗粒静电带电速率及带电饱和量均有重要影响;环境湿度越大,颗粒带电量越小;随筛分仪振幅增加,颗粒振荡摩擦越剧烈,促进了颗粒-筛网壁间电荷转移,颗粒带电量增大;随振荡时间的增加,颗粒带电呈指数型增加并趋于饱和,同时其饱和带电量随颗粒粒径的增大而增大。但颗粒粒径增大,颗粒质量增加,导致颗粒带电荷/质比减小。通过控制粒径及振荡和筛分时间,可合理控制绝缘聚烯烃颗粒产品静电带电量。 | 兰琦 李亮亮 梁财 孟鹤 陶彬 刘全桢 | 2022 | 石油学报(石油加工)2022，38，4： | 1 |
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