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Investigation on the properties of compacted silty clay subjected to electro-osmosis using bender element

Research in Cold and Arid Regions 2023年第6期15卷 253-261页

作者： KangWei Tang Chuang Lin Hao Wang WeiJun Qin DeCheng Feng Feng Zhang School of Transportation Science and Engineering Harbin Institute of Technology73 Huanghe RoadHarbinHeilongjiang 150090China Laboratoire Navier/CERMES Ecole des Ponts ParisTech6 et 8 Avenue Blaise PascalCite DescartesChamps-sur-Marne77455 Marne La Vallee Cedex 2France Key Laboratory of Transportation Industry for Highway Construction and Maintenance Technology in Seasonal Frozen Soil Areas(Changchun) 4887 Xinglong RoadChangchunJinlin 130102China

The moisture content of subgrade soil in seasonally frozen regions is often higher than its optimum value,leading to a decline in mechanical properties and a reduction in subgrade bearing capacity.electro-osmosis has shown promise as a technology for controlling subgrade moisture,but significant heterogeneity has also been observed in treated soil.This study investigates the impact of electro-osmosis on soil stiffness through a series of bender element tests of compacted clay.The effects of dry density and supply voltage on the performance of electroosmosis treatment and the layered structure and anisotropy of the soil were analyzed.The results show that electro-osmosis treatment increased the shear wave velocity of the soil by 140% compared to untreated saturated soil and by 70% compared to soil with optimum water content.It has also been found that layered compaction of soil resulted in a layered structure,with electro-osmosis having a more prominent impact on soil near the cathode,resulting in a more pronounced layered structure.Besides,electro-osmosis was found to enhance soil anisotropy,particularly near the anode.Increasing the dry density and voltage levels can help improve soil uniformity.These findings provide insights into the potential use of electro-osmosis in improving soil stiffness,which could benefit various engineering applications.

关键词： Subgrade soil electro-osmosis Bender element Layered structure Anisotropy

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Heat transfer and Helmholtz-Smoluchowski velocity in Bingham fluid flow

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Applied Mathematics and Mechanics(English Edition) 2020年第8期41卷 1167-1178页

作者： A.SALEEM M.N.KIANI S.NADEEM A.ISSAKHOV Mathematics and Its Applications in Life Sciences Research Group Ton Duc Thang UniversityHo Chi Minh 7000Vietnam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh 7000Vietnam Department of Mathematics Quaid-i-Azam UniversityIslamabad 44000Pakistan Faculty of Mechanics and Mathematics Al-Farabi Kazakh National UniversityAlmaty 0500Kazakhstan

A mathematical study is developed for the electro-osmotic flow of a nonNewtonian fluid in a wavy microchannel in which a Bingham viscoplastic fluid model is considered.For electric potential distributions,a Poisson-Boltzmann equation is employed in the presence of an electrical double layer(EDL).The analytical solutions of dimensionless boundary value problems are obtained with the Debye-Huckel theory,the lubrication theory,and the long wavelength approximations.The effects of the Debyelength parameter,the plug flow width,the Helmholtz-Smoluchowski velocity,and the Joule heating on the normalized temperature,the velocity,the pressure gradient,the volumetric flow rate,and the Nusselt number for heat transfer are evaluated in detail using graphs.The analysis provides important findings regarding heat transfer in electroosmotic flows through a wavy microchannel.

关键词： electro-osmosis Bingham viscoplastic fluid electric double layer(EDL) heat transfer Joule heating

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electro-magnetohydrodynamic Flow of Biofluid Induced by Peristaltic Wave： A Non-newtonian Model

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Journal of Bionic Engineering 2016年第3期13卷 436-448页

作者： Gopal Chandra Shit Nayan Kumar Ranjit Aniruddha Sinha Department of Mathematics Jadavpur University Kolkata - 700032 India Yogoda Satsanga Palpara Mahavidyalaya Purba Medinipur - 721458 India

This article aims to develop a mathematical model for peristaltic transport of magnetohydrodynamic flow of biofluids through a micro-channel with rhythmically contracting and expanding walls under the influence of an applied electric field. The couple stress fluid model is considered to represent the non-Newtonian characteristics ofbiofluids. The velocity slip condition at the channel walls is taken into account because of the hyclrophilic/hydrophobic interaction with negatively charged walls. The essential features of the electromagnetohydrodynamic flow of biofluid through micro-channels are clearly highlighted in the variations of the non-dimensional parameters of the physical quantities of interest such as the velocity, wall shear stress, pressure gradient, pressure rise per wave length, frictional force at the channel walls and the distribution of stream function. It reveals that the flow ofhiofluid is appreciably influenced by the sufficient strength of externally applied magnetic field and electro-osmotic parameter. The velocity slip condition reduces the frictional force at the channel wall. Moreover, the formation of the trapping bolus strongly depends on electro-osmotic parameter and magnetic field strength.

关键词： peristaltic transport couple stress fluid magnetohydrodynamics electro-osmosis

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Debye-Hckel solution for steady electro-osmotic flow of micropolar fluid in cylindrical microcapillary

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Applied Mathematics and Mechanics(English Edition) 2013年第11期34卷 1305-1326页

作者： A. A. SIDDIQUI A. LAKHTAKIA Department of Basic Sciences Bahauddin Zakariya University Nanoengineered Metamaterials Group Department of Engineering Science and MechanicsPennsylvania State University University Park

Analytic expressions for speed, flux, microrotation, stress, and couple stress in a micropolar fluid exhibiting a steady, symmetric, and one-dimensional electro-osmotic flow in a uniform cylindrical microcapillary were derived under the constraint of the Debye-Hiickel approximation, which is applicable when the cross-sectional radius of the microcapillary exceeds the Debye length, provided that the zeta potential is sufficiently small in magnitude. Since the aciculate particles in a micropolar fluid can rotate without translation, micropolarity affects the fluid speed, fluid flux, and one of the two non-zero components of the stress tensor. The axial speed in a micropolar fluid intensifies when the radius increases. The stress tensor is confined to the region near the wall of the mi- crocapillary, while the couple stress tensor is uniform across the cross-section.

关键词： couple stress electro-osmosis microcapillary micropolar fluid microrota-tion steady flow

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Numerical simulation of electroosmosis in unsaturated compacted clay

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Research in Cold and Arid Regions 2021年第5期13卷 394-407页

作者： KangWei Tang Feng Zhang DeCheng Feng GuanFu Wang School of Transportation Science and Engineering Harbin Institute of Technology73 Huanghe RoadHarbinHeilongjiang 150090China

The moisture content of a road subgrade in cold regions will increase after freeze-thaw cycles,resulting in subgrade strength and stiffness losses.electroosmosis is widely used in treating saturated soft soils to decrease the moisture content.The induced moisture migration during electroosmosis in unsaturated soil is much more complex than that of saturated soil because of a series of nonlinear changes in soil properties.This study first uses an exponential function to characterize the relationship between electroosmotic permeability and saturation degree.Then,a one-dimensional model is developed to simulate the electroosmosis-induced moisture migration in unsaturated soil.Simulation results show that electroosmosis reduces the saturation degree of the unsaturated soil,indicating that it can be applied to subgrade dewatering.Key parameters such as soil pore size distribution coefficient,air entry value,and effective voltage significantly affect moisture migration.electroosmotic properties of unsaturated soils are extremely important to the efficiency of electroosmosis.

关键词： electro-osmosis unsaturated clay moisture migration numerical simulation

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Groundwater Drainage By Means Of electrochemistry For Soil Improvement

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Hydro Science & Marine Engineering 2019年第2期1卷 10-14页

作者： Raluca Ioana Nicolae Sebastian Florin Mustatea SC Geostud SRL BucharestRomania

In the last decade,the construction of communication routes has intensified globally.As a result,many case studies have emerged related to the presence of saturated clayey soils in the foundation ground.In order to speed up the execution of highways and railways in a safely manner,the designers use different methods for improving soft clays in terms of compressibility.The present paper aims to evaluate the efficiency of an electrochemical method used for the dewatering of a soft montmorillonite clay subgrade.The effects on the consolidation process are analyzed for the final conclusions.The advantages of the method are briefly discussed,and some potential areas for scientific research are proposed.

关键词： electro-osmosis Compression Soft clay Consolidation Permeability

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