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Influence of Liquid bridge force on physical stability during fuel storage and transportation

Defence Technology（防务技术） 2023年第11期29卷 106-116页

作者： Chi Zhang Chun-hua Bai Jia-fan Ren Jian Yao State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China

The physical stability of solid-liquid fuel is a factor that needs to be considered for fuel product practicability for storage and transportation. To determine the Influence of Liquid bridge force on physical stability, two detection devices were designed. The laws obtained from microscopic experiments are used to verify the physical stability of fuel under different component ratios. The Liquid bridge force is found to increase with the droplet volume. Multiliquid bridges above one critical saturation can generate significant resultant forces compared to single-liquid bridges of the same volume. There exist four states of solid-liquid mixed fuel with increasing liquid saturation rate. The Liquid bridge force between the solid and liquid plays a dominant role in the physical stability of the first three states. There may be two stages involved in the stratification process for state 4 fuel, and the liquid viscosity is another factor that cannot be ignored. In the process of selecting a fuel ratio, a larger Liquid bridge force between the components can be obtained by properly improving the wetting effect so that the fuel shows better physical stability.

关键词： Liquid bridge force Fuel physical stability Multiliquid bridge resultant forces Mixed fuel stratification

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Effects of time-varying Liquid bridge forces on rheological properties,and resulting extrudability and constructability of three-dimensional printing mortar

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Frontiers of Structural and Civil Engineering 2023年第9期17卷 1295-1309页

作者： Peng ZHI Yu-Ching WU Timon RABCZUK Department of Structural Engineering Tongji UniversityShanghai 200092China Institute of Structural Mechanics Bauhaus University of WeimarWeimar 99423Germany

Extrudability and constructability are two important,yet contradictory issues pertaining to the construction of three-dimensional(3D)printing concrete.Extrudability is easily achieved when 3D printing cement mortar has a high water content and low cohesion,but the printed structure is easily collapsible.However,a 3D printing cement mortar with a low water content and high cohesion has a relatively stable printed structure although the cement mortar might not be extrudable.This study proposes a particle-based method to simulate 3D printing mortar extrusion and construction as an overall planning tool for building design.First,a discrete element model with time-varying Liquid bridge forces is developed to investigate the microscopic effects of these forces on global rheological properties.Next,a series of numerical simulations relevant to 3D printable mortar extrudability and constructability are carried out.The study demonstrates that the effects of time-varying Liquid bridge forces on rheological properties and the resulting extrudability and constructability of 3D printing mortar are considerable.Furthermore,an optimized region that satisfies both the extrusion and construction requirements is provided for 3D printing industry as a reference.

关键词： particle-based simulation Liquid bridge force rheological property 3D printing mortar extrudability constructability

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Study of the wall adhesive tensile contact of moist iron ore bulk solids

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Particuology 2020年第3期18卷 67-75页

作者： Tao Fang Wei Chen Jens Plinke Craig Wheeler Alan Roberts School of Civil Engineering East China Jiaotong UniversityNanchang 330013China School of Engineering The University of NewcastleCallaghan 2308Australia

The adhesive tensile stress between moist bulk iron ore solids and wall surfaces are critical to control and avoid blockage in large throughput material handling plants.In this study,an experimental system was designed to investigate the adhesive tensile contact between a range of iron ore materials and wall lining specimens.The contact mechanism between the material specimen and the wall surface was initially characterised.The experimental results indicated that the adhesive tensile stress is dependent on both the moisture content and the applied major consolidation stress,with the former exhibiting more significant contribution to increasing the magnitude of stress.The surface roughness of the wall showed a negligible effect in determining the adhesive tensile stress.Additionally,the iron ore sample with a higher fines content was observed to be able to achieve a higher adhesive tensile stress compared to the coarse samples.Consequently,the insights resulting from the study demonstrated practical applicability through measures such as blending and/or beneficiation,which reduce the adhesive tensile stress and minimise blockages.

关键词： Wet sticky material Adhesive tensile stress Wall linings Liquid bridge force Capillary stress Soil texture

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Analysis of liquid bridge between spherical particles

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China Particuology 2007年第6期5卷 420-424页

作者： Fusheng Mu Xubin Su College of Mechanical and Electrical Engineering Central South University Changsha 410083 China

A pair of central moving spherical particles connected by a pendular liquid bridge with interstitial Newtonlan fluid is otten encountered in particulate coalescence process. In this paper, by assuming perfect-wet condition, the effects of liquid volume and separation distance on static liquid bridge are analyzed, and the relation between rupture energy and liquid bridge volume is also studied. These points would be of significance in industrial processes related to adhesive particles.

关键词： Surface-wet Liquid bridge force Rupture energy Viscous force

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Mechanism and Dynamic Simulation of the Interaction Between Bulldozing Plate and Soil Particles by Distinct Element Method

Mechanism and Dynamic Simulation of the Interaction Between ...

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The Sixth International Conference on Measurement and Control of Granular Materials

作者： Li Jianqiao Zhang Rui Li Yinwu The Key Laboratory for Terrain-Machine Bionics Engineering(Ministry of Education,China),Jilin University,Changchun 130025,China

Distinct Element Method(DEM)is a highly nonlinear dynamic simulative method of discrete element aggregation.The basic theory of DEM was briefly introduced.The actual situation of DEM applying to the research of terramechanics was discussed and analyzed.The conventional DEM model was modified through considering the magnitude of Liquid bridge force caused by soil water,in order to make the simulative results much more approach to the real situation.The mechanical relation of the interaction between bulldozing plate and soil particles was studied and the resultant force acting on the surface of the bulldozing plate with unit width by soil particles was analyzed,which provided a stable foundation for dynamic simulation of the interaction between soil engaging components and soil particles by DEM.

关键词： stinct Element Method soil particles dynamic simulation Liquid bridge force discrete material

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