Effect of a weak magnetic field on hematite sol in stationary and flowing systems

Tombácz, Etelka; Ma, Chenhao; Busch, Kenneth W.; Busch, Marianna A.

doi:10.1007/bf00665502

Cited by 39 publications

(28 citation statements)

References 19 publications

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“…The small deviations noted could be attributed to increased shearing. Previous tests conducted by Crolet and Ledion 14 found that scaling was consistently dependent on ow rate through an intrusive MTD and subsequent reports have shown that the turbulence created by the device itself contribute more to observed effects on scale formation than the magnetic ® eld 13 .…”

Section: Results and Discussion Effect On Scaling Kinetics And Scale mentioning

confidence: 93%

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Magnetically Augmented Water Treatment

Parsons

Judd

Stephenson

et al. 1997

Process Safety and Environmental Protection

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A test rig was constructed to investigate the effect of orthogonally applied magnetic ® elds on solutions of calcium carbonate and accompanying changes in scale deposits formed from solution. The rig employed recirculated calcium carbonate solutions, which were passed through magnetic ® elds of strengths up to 7000 Gauss. Scaling occurred on a copper heat exchanger surface at temperatures set at between 408 C and 608 C. Changes in solution chemistry, zeta potential and particle size were also investigated. Scale deposits were analysed by scanning electron microscopy.Results showed that magnetic treatment had a signi® cant effect on the precipitation/ deposition of calcium carbonate from solution under controlled physico-chemical conditions. Scaling was affected by the system temperature, pH and degree of supersaturation. The magnetic ® eld was shown to in¯uence signi® cantly the zeta potential and particle size distribution of particles formed in solution, as well as the crystal morphology of the calcium carbonate deposits.This paper presents a summary of laboratory results and relates them to a possible mechanism.

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Section: Results and Discussion Effect On Scaling Kinetics And Scale mentioning

confidence: 93%

“…It has been reported that the magnetically-induced change in the scaling rate can vary with: · Dissolved solids concentration 13 .…”

Section: Results and Discussion Effect On Scaling Kinetics And Scale mentioning

confidence: 99%

Magnetically Augmented Water Treatment

Parsons

Judd

Stephenson

et al. 1997

Process Safety and Environmental Protection

View full text Add to dashboard Cite

show abstract

“…Tombacz E et al [3,4] studied the effect of a weak magnetic field on hematite sol in stationary and flowing systems. They found that when the flow direction was vertical to the magnetic field direction vector, the cluster of electrolyte particle was formed in the solution.…”

Section: Introductionmentioning

confidence: 99%

“…In the hard water, it is known that Ca 2+ and Mg 2+ are diamagnetism, but CO 3 2-, HCO 3 -and SO 4 2-are paramagnetism according to Van Vleck's theory [7,8]. Therefore the direction of gradient magnetic force acting on Ca 2+ and Mg 2+ is opposite with the direction of gradient magnetic force acting on CO 3 2-, HCO 3 -and SO 4 2-. Therefore the negative ions and positive ions are formed into clusters respectively, and the clusters in the solution can become many seeds of the scale crystal.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Gradient Optimization for Electronic Anti-Fouling Effect in Heat Exchanger

Han¹,

Wang²

2014

Journal of Electrical Engineering and Technology

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-A new method for optimizing the magnetic field gradient in the exciting coil of electronic anti-fouling (EAF) system is presented based on changing exciting coil size. In the proposed method, two optimization expressions are deduced based on biot-savart law. The optimization expressions, which can describe the distribution of the magnetic field gradient in the coil, are the function of coil radius and coil length. These optimization expressions can be used to obtain an accurate coil size if the magnetic field gradient on a certain point on the coil's axis of symmetry is needed to be the maximum value. Comparing with the experimental results and the computation results using Finite Element Method simulation to the magnetic field gradient on the coil's axis of symmetry, the computation results obtained by the optimization expression in this article can fit the experimental results and the Finite Element Method results very well. This new method can optimize the EAF system's anti-fouling performance based on improving the magnetic field gradient distribution in the exciting coil.

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“…The effect of EMP is of considerable importance in numerous practical applications, such as the separation of biological particles (DNA fragments, proteins, cells, yeasts, etc.) due to the differences in their sizes and electric conductivities [4]- [8], aggregation and disaggregation of colloidal suspensions [9]- [11], removal of small nonmetallic inclusions or impurities from molten metals [12] [13], measurement of the particle-wall interaction force [14] [15], determination of glycation on diabetic erythrocytes [16], operation of multicolor display devices [17], and manipulation of autocatalytic micro/nanomotors or other colloidal particles [18]- [22].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetophoresis of a Colloidal Sphere in a Spherical Cavity

Hsieh¹,

Keh²

2014

JEMAA

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The quasi-steady electromagnetophoretic motion of a spherical colloidal particle positioned at the center of a spherical cavity filled with a conducting fluid is analyzed at low Reynolds number. Under uniformly applied electric and magnetic fields, the electric current and magnetic flux density distributions are solved for the particle and fluid phases of arbitrary electric conductivities and magnetic permeabilities. Applying a generalized reciprocal theorem to the Stokes equations modified with the resulted Lorentz force density and considering the contribution of the magnetic Maxwell stress to the force exerted on the particle, which turns out to be important, we obtain a closed-form formula for the migration velocity of the particle valid for an arbitrary value of the particle-to-cavity radius ratio. The particle velocity in general decreases monotonically with an increase in this radius ratio, with an exception for the case of a particle with high electric conductivity and low magnetic permeability relative to the suspending fluid. The asymptotic behaviors of the boundary effect on the electromagnetophoretic force and mobility of the confined particle at small and large radius ratios are discussed.

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Effect of a weak magnetic field on hematite sol in stationary and flowing systems

Cited by 39 publications

References 19 publications

Magnetically Augmented Water Treatment

Magnetically Augmented Water Treatment

Magnetic Field Gradient Optimization for Electronic Anti-Fouling Effect in Heat Exchanger

Electromagnetophoresis of a Colloidal Sphere in a Spherical Cavity

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