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Study on cavern evolution and performance of three mixers in agitation of yield-pseudoplastic fluids

Chinese Journal of Chemical Engineering 2023年第3期55卷 111-122页

作者： Songsong Wang Hong Li Changyuan Tao renlong liu Yundong Wang Zuohua liu School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China Graduate School Chongqing UniversityChongqing 400044China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing 400044China Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

The hydrodynamic performance of three mixers single shaft central mixer(SSC), single shaft off-centred mixer(SSO), dual shaft off-centred mixer(DSO), was investigated in the mixing of yield-pseudoplastic fluids(xanthan gum solutions) in the laminar regime. To explore and determine the efficiency of three mixers, both numerical and experimental approaches were adopted. The fluid rheology was described by the Herschel–Bulkley rheological model. Computational fluid dynamics was employed to simulate the apparent viscosity distribution, mixing time, and the flow pattern inside the stirred tank. The developed model was validated through experimentally measured torque. The influence mechanism of the rotational speed and fluid rheology on the cavern evolution was explored deeply. The performances of three mixers in this work were compared at the constant power input and fluid rheology with respect to the flow pattern, mixing time, and mixing efficiency. The results verify that the faster the rotating speed, the greater influence of the fluid rheology on the cavern evolution, and the more uniform apparent viscosity distribution. Moreover, the mixing time decreases continuously as the increasing power consumption per unit volume, and the dimensionless mixing time of DSO mixer was nearly 42.8% and 6.1% shorter than that of SSC and SCO mixer at the same Reynolds number, respectively. According to the mixing efficiency criteria, these data also revealed that DSO was more efficient than SSC and SSO.

关键词： Cavern Apparent viscosity Mixing Yield-pseudoplastic fluids Computational fluid dynamics(CFD)

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Experimental study of power consumption, local characteristics distributions and homogenization energy in gas–liquid stirred tank reactors

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Chinese Journal of Chemical Engineering 2019年第2期27卷 278-285页

作者： Facheng Qiu Zuohua liu renlong liu Xuejun Quan Changyuan Tao Yundong Wang School of Chemistry and Chemical Engineering Chongqing University School of Chemistry and Chemical Engineering Chongqing University of Technology Department of Chemical Engineering Tsinghua University

In this paper, the power consumption, the vertical local void fraction and the local gas–liquid interfacial area are investigated in the aerated stirred tank reactors(STRs) equipped with a rigid-flexible impeller. Meanwhile, the regressive correlation based on power consumption and interfacial area is proposed. Then a novel homogenization energy(HE = RSDPtm) expression based on power consumption and local interfacial area is redefined and used to indicate the mixing efficiency. The optimal operating mode is selected based on the change of the HE value. This paper can provide research ideas for structural optimization of stirred reactors.

关键词： Stirred tank Gas-liquid two-phase Power consumption Local characteristics Homogenization energy

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Experimental Investigation on Fracture Performance of Short Basalt Fiber Bundle Reinforced Concrete

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Structural Durability & Health Monitoring 2022年第4期16卷 291-305页

作者： Jinggan Shao Jiao Ma renlong liu Ye liu Pu Zhang Yi Tang Yunjun Huang School of Water Conservancy and Civil Engineering Zhengzhou UniversityZhengzhou450001China Henan Traffic Engineering Technology Co. Ltd.Zhengzhou450015China Key Laboratory of Deep Underground Science and Engineering(Ministry of Education) College of Architecture and EnvironmentSichuan UniversityChengdu610065China Henan Provincial Communications Planning&Design Institute Co. Ltd.Zhengzhou450015China

In this paper,a notched three-point bending test is used to study the fracture performance of the short basalt fiber bundle reinforced concrete(SBFBRC).To compare and analyze the enhancement effect of different diameters and different content of basalt fiber bundles on the fracture performance of concrete,some groups are set up,and the P-CMOD curves of each group of specimens are measured,and the fracture toughness and fracture energy of each control group are *** fracture toughness and fracture energy are two important fracture performance parameters to study the effect and law of the new basalt fiber bundles on the fracture performance of *** research results show that the diameter and content of the new basalt fiber bundles have a certain effect on the fracture performance of *** the increase of the content of basalt fiber bundles,the peak load,crack initiation toughness,instability toughness and fracture energy of SBFBRC are greatly improved compared with the benchmark *** the fiber bundle diameter is 0.2 mm,the peak load increases by 69.5%compared with the reference *** instability toughness reaches its maximum value at 0.2 mm diameter,which is 59.7%higher than the benchmark.

关键词： Basalt fiber bundle fracture toughness fracture energy fiber concrete

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BTG2、ARL2在非小细胞肺癌中的表达及其病理分型的相关性

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齐齐哈尔医学院学报 2024年第11期45卷 1030-1033页

作者：孙涛刘仁龙段美丽吕天琳姜彩丽杨铁波齐齐哈尔市第一医院呼吸与危重症科黑龙江齐齐哈尔161000

目的探讨ADP核糖基化样因子2(ARL2)、B细胞异位基因2(BTG2)蛋白在非小细胞肺癌组织中表达水平及其病理分型相关性分析。方法选择2021年5月—2022年5月本院收治的60例非小细胞肺癌患者作为研究对象,共收集非小细胞肺癌的癌组织和癌旁正... 详细信息

目的探讨ADP核糖基化样因子2(ARL2)、B细胞异位基因2(BTG2)蛋白在非小细胞肺癌组织中表达水平及其病理分型相关性分析。方法选择2021年5月—2022年5月本院收治的60例非小细胞肺癌患者作为研究对象,共收集非小细胞肺癌的癌组织和癌旁正常组织标本60对,其中非小细胞肺癌的癌组织作为实验组,癌旁正常组织作为对照组。应用免疫组化方法分别检测非小细胞肺癌患者的癌组织和癌旁组织中ARL2蛋白和BTG2蛋白的表达水平。分析ARL2蛋白和BTG2蛋白的表达水平与非小细胞肺癌的临床病理分型相关性。结果实验组中ARL2蛋白表达阳性率为66.7%,,明显高于对照组的25.4%(P0.05);而与肿瘤TNM分期、淋巴结转移、肿瘤最大直径、复发率、病理学分级、复发相关性密切,差异具有统计学意义(P<0.05)。统计患者的1年生存率为47.6%(29/60),其中ARL2阳性生存率为31.0%(6/20),ARL2阴性生存率为81.0%(30/40);BTG2阳性生存率为96.1%(25/26),BTG2阴性生存率为35.0%(11/34);ARL2阴性、BTG2阳性非小细胞肺癌患者生存率显著增高(P<0.001)。结论非小细胞肺癌患者的ARL2蛋白表达明显升高,BTG2蛋白表达水平明显降低,证实了ARL2水平的高表达和BTG2的低表达,对非小细胞肺癌患者的ARL2阳性蛋白、BTG2阴性表达与病理分型有着十分密切的相关性,值得未来在预后方面进一步研究探讨。

关键词： ADP核糖基化样因子2 B细胞异位基因2 非小细胞肺癌临床预后

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过程强化理论与装备研发相结合,提升研究生工程化意识

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广东化工 2024年第12期51卷 187-189,207页

作者：刘作华杨洁张骞陶长元范兴杜军刘仁龙李泽全李宏重庆大学化学化工学院重庆400044 重庆大学研究生院重庆400030

化学工业作为国民基础支柱产业,其重要性不言而喻,随着国外对诸多技术的垄断控制,国家迫切需要一批能满足国家和企业要求的高质量人才,一方面可以应用相关专业知识解决实际生产问题,另一方面,也要打破国外垄断、突破技术瓶颈,建立拥有... 详细信息

化学工业作为国民基础支柱产业,其重要性不言而喻,随着国外对诸多技术的垄断控制,国家迫切需要一批能满足国家和企业要求的高质量人才,一方面可以应用相关专业知识解决实际生产问题,另一方面,也要打破国外垄断、突破技术瓶颈,建立拥有自主知识产权的先进化工装备。过程强化理论与技术是化学工业中一个快速发展的重要研究方向,目前已经在诸多领域中得到了广泛应用。而化学反应过程涉及一系列复杂的非线性动力学知识,这就要求学生掌握牢固的理论基础,而另一方面,培养单位也需要瞄准国家重大战略需求开展相关研究生培养工作,例如各种新兴技术的工业化、产业化和市场化等。建设和发展与生产实践相适应的教学内容及课程体系,是教学改革的重要发展方向。本文提出以化工过程强化理论与装备研发相结合的教学理念,形成产教融合的发展模式,助力培养高层次化工人才的工程意识、创新能力和战略思维。

关键词：过程强化化学人才培养模式产教融合

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Microwave-aided roasting for extraction of vanadium from stone coal

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化工进展 2010年第S1期29卷 494-497页

作者：杜军王娜陶长元刘作华刘仁龙 College of Chemistry & Chemical Engineering Chongqing University

Low recovery rate,high energy consumption and serious pollution are existed in traditional processes of vanadium *** seek a new process with high recovery rate,low energy consumption and less pollution discharge is of great ***-aided roasting for vanadium extraction is an environmentally-friendly ***-pollution roasting processes with additives following sodium carbonate and potassium carbonate,under microwave irradiation were investigated with stone *** valence variation of vanadium in oxidation roasting of the vanadium bearing stone coal was *** results showed that the oxidation process of vanadium was a stepwise process following V(Ⅲ)→V(Ⅳ)→V(Ⅴ).The roasted stone coal was characterized by XRD,*** associated with extraction rate were investigated following roasting temperature,roasting time,microwave power,and amount of roasting *** with conventional roasting process,the recovery rate was higher without air pollution.

关键词： microwave irradiation stone coal roasting additive

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新型汽车效果涂料色差评估方法的探讨

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涂料工业 2013年第6期43卷 57-62页

作者：刘仁龙上海大众汽车有限公司上海201805

结合多年实际工作经验,探讨了评价汽车效果涂料色差更合理的方法。汽车效果涂料色差评估需将视觉评估和仪器测试评估相结合,仪器测量的数据结果需选用合适的色差计算数学模型才能将仪器评价的结果与人眼视觉感知效果涂料色差结果保持一致。

关键词：汽车效果涂料色差评估方法色差检测与控制色差计算数学模型

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Removal of ammonium from steel wastewater by struvite precipitation

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化工进展 2010年第S1期29卷 686-689页

作者：刘作华肖翠翠刘仁龙陶长元 College of Chemistry & Chemical Engineering Chongqing University

Ammonia is the major pollutant in many industrial and agricultural wastewaters,while with an increasing demand for nitrogen fertilizer worldwide,recovery of ammonia from high concentration ammonium wastewater is a significant way to reduce environmental pollution and to meet the development *** present work was to investigate the factors following pH value,molar ratio of chemical reagents to afford theoretical support for wastewater treatment and resource *** of struvite was analyzed by X-ray diffraction(XRD).Results indicated that by formation of magnesium ammoniumphosphate,ammonium in steel wastewater could be removed under the conditions following pH 10,with molar ratio of PO43-∶NH4+∶Mg2+ 1.3∶1∶1.2,and the ammonium removal efficiency was up to 95%.

关键词： magnesium ammoniumphosphate(MAP) steel wastewater ammonium removal

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Microwave-assisted leaching of vanadium from vanadium slag with sulfuric acid

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化工进展 2010年第S1期29卷 690-694页

作者：陶长元肖翠翠刘作华杜军刘仁龙 College of Chemistry & Chemical Engineering Chongqing University

Microwave irradiation was used to investigate vanadium slag in place of traditional *** associated with vanadium extraction ratio were studied following the concentration of leaching agent,oxidant dosage,microwave power,microwave irradiation time and mass ratio of liquid to *** indicated that leaching ratio based on microwave leaching at atmospheric pressure can get to 68.48% under the conditions following sulfuric acid concentration 30%,mass ratio of liquid to solid ratio 2∶1,mass ratio of vanadium slag to manganese dioxide dosage 25∶1.4,and microwave power 800W for 3.5 h at 95 ℃.While,leaching ratio based on microwave leaching under pressure was up to 45.79% under the conditions following sulfuric acid concentration 20%,mass ratio of liquid to solid ratio 2∶1,mass ratio of vanadium slag to manganese dioxide dosage 25∶0.9,microwave power 800W for 10 *** showed leaching based on microwave irradiation under pressure can shorten time 94.44% in comparison with that at atmospheric pressure,and the leaching extraction can improve about 20%.

关键词： microwave irradiation hydrometallurgy pressure leaching vanadium slag

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刚柔组合搅拌桨强化搅拌槽中流体混沌混合

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化工学报 2014年第1期65卷 61-70页

作者：刘作华陈超刘仁龙陶长元王运东重庆大学化学化工学院重庆400044 清华大学化学工程系北京100084

搅拌槽内普遍存在着两种不同类型的混合区域:混沌混合区和规则区。增大混沌混合区,是提高流体混合效率、降低搅拌过程能耗的重要途径。而合理设计搅拌桨有助于流体形成适宜的流动状态,实现混沌混合。柔性体与刚性体组合,可设计出具有多... 详细信息

搅拌槽内普遍存在着两种不同类型的混合区域:混沌混合区和规则区。增大混沌混合区,是提高流体混合效率、降低搅拌过程能耗的重要途径。而合理设计搅拌桨有助于流体形成适宜的流动状态,实现混沌混合。柔性体与刚性体组合,可设计出具有多体运动行为的刚柔组合搅拌桨,可强化流体混沌混合行为。结合Matlab软件,实验研究了双层桨搅拌槽内自来水体系的最大Lyapunov指数(LLE)和多尺度熵(MSE)的变化规律,对比分析了刚性桨和刚柔组合桨两种桨叶对流体混沌混合的影响。结果表明,刚柔组合桨强化流体的运动特性,使更多流体进入混沌混合状态。在转速为210 r·min-1时,流体的混沌混合达到最佳状态,刚性桨体系的LLE为0.041,而刚柔组合桨体系的LLE为0.048;刚柔组合桨可有效耗散能量,使整个槽体的能量分布均匀,刚柔组合桨在150 r·min-1时的多尺度熵率与刚性桨在210 r·min-1时基本相近;刚柔组合桨体系的混合时间均低于刚性桨体系,在转速为120 r·min-1时,刚柔组合桨使流体的混合时间缩短了26%左右。刚柔组合桨可改变流场结构和能量耗散方式,强化流体混沌混合,实现高效节能操作。

关键词：混合搅拌槽传递混沌最大Lyapunov指数多尺度熵刚柔组合桨

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