Strong magnetic field-induced segregation and alignment of nonmagnetic particles

Sun, Zhi; Guo, Muxing; Zhang, Fei; Biest, Omer Van der; Blanpain, Bart

doi:10.1063/1.3535270

Cited by 7 publications

(7 citation statements)

References 14 publications

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“…The resulting magnetothermal force, streamlines, and isothermal contours are shown in Fig. 3 for both the heated and cooled cases at Ra* = 0.510 4 and Zc = 3.0. As shown in Fig.…”

Section: Heat and Fluid Flowsmentioning

confidence: 99%

“…6. Local Nusselt number along the pipe for P = 510 5 and Ra*=10 4 . Red lines indicate the heated case, and blue ones indicate the cooled case.…”

Section: Effect On Nusselt Numbermentioning

confidence: 99%

“…This is because the effective area (i.e., tail edge of the solenoid, high B 2 ) is far from the threshold of the cooled region in the cooled case, where the large temperature difference from the inlet is attained, which results in a stronger magnetothermal force at the outlet of the solenoid. (Re0 = 62.4), Ra*=10 4 , and  = 0.01. The solenoid is placed at 3.0  Zc  4.0.…”

Section: Solenoid Coilmentioning

confidence: 99%

“…10. Effects on local Nusselt number on the heated/cooled wall by solenoid coil for Pr=20, P=10 6 (Re0 = 62.4), Ra*=10 4 , and  = 0.01.…”

Section: Solenoid Coilmentioning

confidence: 99%

“…In the late 20th century, extremely strong magnetic fields became available with the emergence of superconducting magnets. Magnetic fields of several tesla or more have allowed various new findings such as the levitation of water droplets under gravity (magneto-Archimedes effect) [2], jets of nitrogen gas in air (Wakayama jet) [3], and nonmagnetic particle alignment [4]. Each of these phenomena is induced by a magnetic force on a material that is not electrically conductive, as given by…”

Section: Introductionmentioning

confidence: 99%

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Magnetothermal force on heated or cooled pipe flow

Kaneda

Suga

2018

International Journal of Heat and Fluid Flow

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The effects of the magnetothermal force on the flows of heat and fluid through a pipe are investigated numerically when the pipe wall is either heated or cooled at constant heat flux. The flow is laminar and a paramagnetic fluid is presumed as the working fluid. Because the magnetic susceptibility of a paramagnetic fluid depends on the inverse of its temperature, the magnetothermal force is induced by coupling of the temperature field and magnetic induction. First, the effects are discussed using the case of a magnetic field induced by a single-turn concentrically placed electric coil. It is found that the effects of the magnetothermal force differ according to whether the pipe is cooled or heated. When cooled, the heat and fluid flows are affected behind the coil; the flow is repelled from the wall to the center and the thermal boundary layer thickens. By decomposing the force into the radial and axial directions in the heated and cooled cases, it is clarified that the axial force changes from positive to negative depending on the coil location in the heated case. Therefore, it can be concluded that the effects are not simply oppositional in the heated and cooled cases. In relation to the heat transfer, only when the coil is placed at the threshold of the heating/cooling zone do the effects on the local heat transfer become the opposite of each other. At other coil locations, the suppression of heat transfer is dominant ahead of the coil in the heated case, as indicated in previous work by our group. However, in the cooled case, this effect occurs behind the coil. For a more practical case, a solenoid coil is employed in the simulation. It is then found that the effect on the heat transfer becomes remarkable at the solenoid edges, especially for the heat-transfer suppression in both the heated and cooled cases.

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“…The resulting magnetothermal force, streamlines, and isothermal contours are shown in Fig. 3 for both the heated and cooled cases at Ra* = 0.510 4 and Zc = 3.0. As shown in Fig.…”

Section: Heat and Fluid Flowsmentioning

confidence: 99%

“…6. Local Nusselt number along the pipe for P = 510 5 and Ra*=10 4 . Red lines indicate the heated case, and blue ones indicate the cooled case.…”

Section: Effect On Nusselt Numbermentioning

confidence: 99%

Section: Solenoid Coilmentioning

confidence: 99%

“…10. Effects on local Nusselt number on the heated/cooled wall by solenoid coil for Pr=20, P=10 6 (Re0 = 62.4), Ra*=10 4 , and  = 0.01.…”

Section: Solenoid Coilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetothermal force on heated or cooled pipe flow

Kaneda

Suga

2018

International Journal of Heat and Fluid Flow

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Strong static magnetic field processing of metallic materials: A review

Sun¹,

Guo²,

Zhang³

et al. 2012

Current Opinion in Solid State and Materials Science

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Refinement and growth enhancement of Al2Cu phase during magnetic field assisting directional solidification of hypereutectic Al-Cu alloy

Wang

Sheng

Fautrelle

et al. 2016

Sci Rep

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Understanding how the magnetic fields affect the formation of reinforced phase during solidification is crucial to tailor the structure and therefor the performance of metal matrix in situ composites. In this study, a hypereutectic Al-40 wt.%Cu alloy has been directionally solidified under various axial magnetic fields and the morphology of Al2Cu phase was quantified in 3D by means of high resolution synchrotron X-ray tomography. With rising magnetic fields, both increase of Al2Cu phase’s total volume and decrease of each column’s transverse section area were found. These results respectively indicate the growth enhancement and refinement of the primary Al2Cu phase in the magnetic field assisting directional solidification. The thermoelectric magnetic forces (TEMF) causing torque and dislocation multiplication in the faceted primary phases were thought dedicate to respectively the refinement and growth enhancement. To verify this, a real structure based 3D simulation of TEMF in Al2Cu column was carried out, and the dislocations in the Al2Cu phase obtained without and with a 10T high magnetic field were analysed by the transmission electron microscope.

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Strong magnetic field-induced segregation and alignment of nonmagnetic particles

Cited by 7 publications

References 14 publications

Magnetothermal force on heated or cooled pipe flow

Magnetothermal force on heated or cooled pipe flow

Strong static magnetic field processing of metallic materials: A review

Refinement and growth enhancement of Al2Cu phase during magnetic field assisting directional solidification of hypereutectic Al-Cu alloy

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