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blockage of the Deep-Sea Mining Pump Transporting Large Particles with Different Sphericity

China Ocean Engineering 2023年第2期37卷 343-352页

作者： TENG Shuang KANG Can LI Ming-hui QIAO Jin-yu DING Ke-jin School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013China Zibo Product Quality Testing Research Institute Zibo 255063China Shanghai Marine Equipment Research Institute Shanghai 200031China

The present study aims to plumb blockage of the deep-sea mining pump transporting large particles with different shapes. A numerical work was performed through combining the computational fluid dynamics(CFD) technique and the discrete element method(DEM). Six particle shapes with sphericity ranging from 0.67 to 1.0 were selected. A velocity triangle is built with the absolute, relative, and circumferential velocities of particles. Velocity triangles with absolute velocity angles ranging from 90° to 180° prevail in the first-stage impeller. With declining sphericity, more particles follow the velocity triangle with absolute velocity angles ranging from 0° to 90°, which weakens the ability of particles to pass through the flow passage. Furthermore, the forces acting on the particles traveling in the impeller passage are analyzed. Large particles, especially non-spherical ones, suffer from high centrifugal force and therefore move along the suction surface of the impeller blades. Non-spherical particles undergo great drag force as a result of large surface area. The distribution of drag force angles is featured by two peaks, and one vanishes due to *** particle sphericity declines, both magnitude and angle of the pressure gradient force decrease. Variation of the drag force and the pressure gradient force causes clockwise deflection of the centripetal force, resulting in deflection and elongation of particle trajectory, which increases the possibility of blockage.

关键词： deep-sea mining pump particle sphericity velocity triangle force angle particle trajectory blockage

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Numerical and Experimental Study of blockage Effect Correction Method in Towing Tank

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China Ocean Engineering 2019年第5期33卷 522-536页

作者： GUO Chun-yu XU Pei WANG Chao KAN Zi College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China Scool of Aeronautic Science and Engineering Beihang University Beijing 100191 China

When a ship model test is performed in a tank, particularly when the tank is small and the ship model is relatively large, the blockage effect will inevitably occur. With increased ship model scale and speed, the blockage effect becomes more obvious and must be corrected. In this study, the KRISO 3600 TEU Container Ship (KCS) is taken as a model and computational fluid dynamics techniques and ship resistance tests are applied to explore the mechanism and correction method of the blockage effect. By considering the degrees of freedom of the sinkage and trim, the resistance of the ship model is calculated in the infinite domain and for blockage ratios of 1.5%, 1.8%, 2.2%, and 3.0%. Through analysis of the free surface, pressure distribution, and flow field around the ship model, the action law of the blockage effect is studied. The Scott formula and mean flow correction formula based on the average cross sectional area are recommended as the main correction methods, and these formulas are improved using a factor for the return flow velocity correction based on comparison of the modified results given by different formulas. This modification method is verified by resistance test data obtained from three ship models with different scale ratios.

关键词： blockage effect ship model resistance blockage ratio KCS ship CFD

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Flume Experiment on Stream blockage by the Debris Flow From Tributary

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四川大学学报（工程科学版） 2005年第S1期37卷 64-70页

作者： He, Yiping Guo, Zhixue Li, Yong Cui, Peng Wang, Zhaoyin Dept. of Hydraulic and Hydro-electrical Eng. Tsinghua Univ. Beijing 100084 China Chengdu Inst. of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China State Key Lab. of Hydraulics and Mountain River Eng. Sichuan Univ. Chengdu 610065 China

Stream blockage by the debris flow from tributary valleys is a common phenomenon in mountainous area,which takes place when large quantities of sediment transported by debris flow reaches a river channel causing its complete or partial *** dam formed by debris flow may causes upstream and downstream flooding,and presents great threat to people and *** of the catastrophic influence on people and property,debris-flow dam has attracted many attentions from the researchers and local adm...

关键词： Debris flow blockage critical condition flume experiment

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A new strategy for tube leakage and blockage detection using bubble motion-based solid-liquid triboelectric sensor

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Science China(Technological Sciences) 2022年第2期65卷 282-292页

作者： ZHANG XiaoLong DONG Yang XU Xiang QIN HongLing WANG DaoAi Hubei Key Laboratory of Hydroelectric Machinery Design&Maintenance China Three Gorges UniversityYichang 443002China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Qingdao Center of Resource Chemistry and New Materials Qingdao 266100China

Exploring a rapid, reliable, and practical means to detect blockages and leakages in liquid pipelines and accurately locate their positions is of great importance in practical engineering applications. Here, we report a bubble motion-based triboelectric sensor(BM-TES) for detecting and locating the blockages and leaks inside a plastic tube. This simple-designed, environment-friendly,non-damaging sensor is composed of several ring-shaped Cu electrodes distributed on a polytetrafluoroethylene tube. The selfpowered movement of the bubble under the action of buoyancy makes the inner wall of the tube change from the original solidliquid phase to the gas-solid-liquid phase, which results in a short-term contact and separation between the liquid and the *** on the fractional triboelectric effect of the liquid-solid contact, an obvious real-time stable voltage peak will be generated where the detection bubble passes. The obvious peaks of the open-circuit voltage with respect to time correspond with the electrode distribution. Then, the peaks can be utilized as a robust and sensitive indicator for detecting blockage and leakage, as the number of obvious peaks of the open-circuit voltage is directly related to the blockage and leakage location. The blockage and leakage in a fluid tube were successfully detected using the BM-TES with an accuracy of 10 cm. In addition, the BE-TES was able to detect the water flow velocity in the pipe. The experimental results showed that BM-TES can provide a new strategy and method for liquid tube monitoring and has great potential application value in related fields.

关键词： solid-liquid triboelectric self-powered bubble blockage leakage

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Partial flow blockage analysis of the hottest fuel assembly in SNCLFR-100 reactor core

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Nuclear Science and Techniques 2018年第1期29卷 110-117页

作者： Kang-Li Shi Shu-Zhou Li Xi-Lin Zhang Peng-Cheng Zhao Hong-Li Chen School of Nuclear Science and Technology University of Science and Technology of China

In this paper, we perform an unprotected partial flow blockage analysis of the hottest fuel assembly in the core of the SNCLFR-100 reactor, a 100 MW_(th) modular natural circulation lead-cooled fast reactor, developed by University of Science and Technology of China. The flow blockage shall cause a degradation of the heat transfer between the fuel assembly and the coolant potentially,which can eventually result in the clad fusion. An analysis of core blockage accidents in a single assembly is of great significance for LFR. Such scenarios are investigated by using the best estimation code RELAP5. Reactivity feedback and axial power profile are considered. The crosssectional fraction of blockage, axial position of blockage,and blockage-developing time are discussed. The cladding material failure shall be the biggest challenge and shall be a considerable threat for integrity of the fuel assembly if the cross-sectional fraction of blockage is over 94%. The blockage-developing time only affects the accident progress. The consequence will be more serious if the axial position of a sudden blockage is closer to the core *** method of analysis procedure can also be applied to analyze similar transient behaviors of other fuel-type reactors.

关键词： Transient analysis Flow blockage LFR Natural circulation RELAP5 code

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Experimental Investigation of Yarn Twist blockage

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Journal of China Textile University(English Edition) 1999年第2期16卷 57-60页

作者：郭保平陶肖明罗天毅 The Hong Kong Polytechnic Univ Hong Kong Hong Kong

In twisting a yarn running over a guide surface, the twist inserted into the part in front of the guide is impeded to transmit freely to the part behind the contact zone. A new device has been set up for investigating twist blockage and yarn torque - twist simultaneously. Measurements of twist blockage in relationship to different parameters have been carried out by using a monofilament yarn and a multifilament yarn. The factors under consideration include the wrap angle, yarn tension and input twist.

关键词： twist blockage yarn torque torque transmission twist propagation

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Calcium　channel　blockage　and　anti-free-radical　actions　of　ginsenosides

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Chinese Medical Journal 1997年第1期 26-27页

作者：钟国赣江岩

ＣａｌｃｉｕｍｃｈａｎｎｅｌｂｌｏｃｋａｇｅａｎｄａｎｔｉｆｒｅｒａｄｉｃａｌａｃｔｉｏｎｓｏｆｇｉｎｓｅｎｏｓｉｄｅｓＺｈｏｎｇＧｕｏｇａｎ钟国赣ａｎｄＪｉａｎｇＹａｎ江岩Ｇｉｎｓｅｎｏｘｉｄｅｓ，ｂｅｉｎｇｔ... 详细信息

ＣａｌｃｉｕｍｃｈａｎｎｅｌｂｌｏｃｋａｇｅａｎｄａｎｔｉｆｒｅｒａｄｉｃａｌａｃｔｉｏｎｓｏｆｇｉｎｓｅｎｏｓｉｄｅｓＺｈｏｎｇＧｕｏｇａｎ钟国赣ａｎｄＪｉａｎｇＹａｎ江岩Ｇｉｎｓｅｎｏｘｉｄｅｓ，ｂｅｉｎｇｔｈｅｍａｉｎａｃｔｉｖｅｃｏｍｐｏ...

关键词：江岩 channel anti-free-radical and blockage actions Calcium

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The effect of blockage of macrophage on tumor-suppresive activity of polyactin B

引用

Chinese Medical Journal 1998年第9期 93-95页

作者：徐长福王晓利王冰韩水平张云峰司履生

Ｔｈｅａｐｐｌｉｃａｔｉｏｎｏｆｂｉｏｌｏｇｉｃａｌｒｅｓｐｏｎｓｅｍｏｄｉｆｉｅｒ（ＢＲＭ）ｈａｓｏｐｅｎｅｄａｎｅｗｗａｙｆｏｒｔｒｅａｔｉｎｇｍａｎｙｄｉｓｅａｓｅｓ，ｅｓｐｅｃｉａｌｙｍａｌｉｇｎａｎｔｔｕｍ... 详细信息

Ｔｈｅａｐｐｌｉｃａｔｉｏｎｏｆｂｉｏｌｏｇｉｃａｌｒｅｓｐｏｎｓｅｍｏｄｉｆｉｅｒ（ＢＲＭ）ｈａｓｏｐｅｎｅｄａｎｅｗｗａｙｆｏｒｔｒｅａｔｉｎｇｍａｎｙｄｉｓｅａｓｅｓ，ｅｓｐｅｃｉａｌｙｍａｌｉｇｎａｎｔｔｕｍｏｒｓｉｎｒｅｃｅｎｔｙｅａｒｓ．...

关键词： blockage effect macrophage activity The

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FLOW RESISTANCE AND HEAT TRANSFER CHARACTERISTICS OF A NEW-TYPE PLATE HEAT EXCHANGER

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Journal of Hydrodynamics 2008年第4期20卷 524-529页

作者： LUAN Zhi-jian ZHANG Guan-min TIAN Mao-cheng FAN Ming-xiu School of Energy and Power Engineering Shandong University Jinan 250061 China

A new-type corrugation Plate Heat Exchanger （PHE） was designed. Results from both numerical simulations and experiments showed that the flow resistance of the working fluid in this new corrugation PHE, compared with the traditional chevron-type one, was decreased by more than 50%, and corresponding heat transfer performance was decreased by about 25%. The flow field of the working fluid in the corrugation PHE was transformed and hence performance difference in both flow resistance and heat transfer was generated. Such a novel plate, consisting of longitudinal and transverse corrugations, can effectively avoid the problem of flow path blockage, which will help to extend the application of PHEs to the situation with unclean working fluids.

关键词： plate heat exchanger flow resistance heat transfer numerical simulation blockage

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Initiation of ice jam in front of bridge piers-An experimental study

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Journal of Hydrodynamics 2019年第1期31卷 117-123页

作者： Jun Wang Jian Hua Pang-pang Chen Jueyi Sui Peng Wu Todd Whitcombe College of Civil and Hydraulic Engineering Hefei University of TechnologyHefei 230009China Modern Green Development Co.LTD Beijing 100028China Environmental Sciences and Engineering Program University of Northern British ColumbiaPrince GeorgeBCCanada Environmental System Engineering Program University of ReginaReginaCanada

The presence of bridge piers in natural rivers significantly changes the flow and boundary *** a consequence,ice jams can often be initiated in front of bridge *** the changes in flow conditions,two types of ice jam formation may appear:surface accumulation of ice blocks (surface ice blockage) and thickened accumulation of ice blocks (vertical ice blockage).In the present study,the initiation process of ice jam was studied based on *** is found that the critical ice concentration for ice jam blockage depends on the ice block dimension,channel opening and flow *** surface blockage conditions,a larger ratio of ice cube dimension to channel opening (between piers) can result in a smaller critical ice concentration for ice jam blockage,which has no obvious relation with flow *** vertical blockage conditions,the critical ice concentration for ice jam blockage increases with flow Froude number and decreases with the ratio of ice dimension to channel opening (between piers).Based on experiments conducted in laboratory,equations for determining critical ice concentration for these two types of ice jam blockage have been developed.

关键词： Bridge piers surface ice blockage vertical ice blockage critical ice concentrations

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