Helmholtz coils model as pulsed electromagnetic field therapy devices for fracture healing using comsol multiphysics

Nismayanti, Anis; Jannah, H.; Rugayya, S.; Maskur, .; Adawiyah, R.

doi:10.1088/1742-6596/1763/1/012060

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…The magnetic flux density occurring in the intercoil gap at different DC currents (I = 1-3 A) was simulated using the finite element method (FEM) by COMSOL Multiphysics (6.0). The ability of COMSOL to simulate the magnetic properties of Helmholtz coils has been demonstrated in many previous studies [12][13][14]. The simulation of the magnetic field is based on the implemented module "Physics of Magnetic Fields".…”

Section: Simulation Of the Magnetic Fieldmentioning

confidence: 99%

“…In this study, a Helmholtz coil is used and examined regarding the homogeneity of the magnetic field. There are numerous studies in the literature on the simulation of the magnetic field of Helmholtz coils with COMSOL Multiphysics [10][11][12]. Therefore, in this study, the homogeneity of the magnetic field generated by the coils was simulated using the finite element method (FEM) by COMSOL Multiphysics and was additionally determined experimentally using a Hall probe.…”

Section: Introductionmentioning

confidence: 99%

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Particulate Matter Detachment from a Magnetizable Single Fiber Applying Magnetic Forces in Ambient Air

2023

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The potential utilization of magnetic effects in gas particle separation is a current subject of research. This paper demonstrates for the first time that a single magnetizable filter fiber can be deflected by a magnetically induced excitation for a selected combination of parameters, resulting in the removal of deposited particle structures with high detachment levels. A correlation between the magnetic flux density and achieved acceleration to overcome the adhesive forces/strength of the particle structure was determined. The degree of detachment after each regeneration was calculated by comparing the projection area before and after detachment using high-speed images. At a magnetic flux density of B = 38.5 mT, accelerations of maximum a = 105 m·s−2 are achieved, depending on the axial position along the single fiber. The degrees of regeneration achieved at these parameters depend on the amount of fiber loading and on the fiber orientation in the gravitational field. The horizontal orientation of the fiber leads to an increased reattachment of precedingly detached particle structures after deflection compared to a vertical orientation. High particle loading on the fiber results in enhanced detachment by inertia. Under the most favorable process conditions investigated, detachment levels of > 90% are achieved.

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Section: Simulation Of the Magnetic Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Particulate Matter Detachment from a Magnetizable Single Fiber Applying Magnetic Forces in Ambient Air

2023

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“…Hasil penelitian ini sesuai dengan simulasi yang dilakukan oleh nismayanti dkk [14] dan sesuai dengan hukum Biotsavart [15] bahwa besar medan magnet B pada jarak X dari pusat lingkaran sepanjang sumbu Koil adalah sebanding dengan jumlah lilitan dan arus serta berbanding terbalik dengan jarak antara kumparan,…”

Section: Hasil Dan Pembahasanunclassified

Desain Alat Terapi Fraktur Berbasis Medan Elektromagnetik

Nismayanti¹,

Hasmia

Maskur

et al. 2021

Gravitasi

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Fraktur adalah patah tulang yang disebabkan oleh trauma atau tenaga fisik. Permasalahan fraktur dapat menjadi besar jika tidak ditangani dengan baik. Untuk itu penyembuhan fraktur menggunakan Pulsed Electromagnetic Field (PEMF) menjadi salah satu solusi. Penelitian ini bertujuan merancang alat terapi fraktur berbasis medan elektromagnetik. Alat terapi fraktur yang dibuat menggunakan kumparan Helmholtz untuk menghasilkan medan magnet dengan variasi jumlah lilitan kawat 50 – 400 lilitan, variasi kuat arus 0,12 – 0,19 A, variasi jarak antara kumparan 5 – 25 cm, dan variasi diameter 19,8 cm dan 22 cm. Berdasarkan data yang diperoleh dapat membuktikan bahwa medan magnet berbanding lurus dengan arus dan jumlah lilitan namun berbanding terbalik terhadap jarak antara kumparan dan besar diameter kumparan. Hasil penelitian menunjukan bahwa nilai medan magnet 150 µT berhasil diperoleh dengan nilai arus 0,15 A, jumlah lilitan kawat sebanyak 300, jarak antara kumparan 10 cm, dan diameter kumparan helmholtz 19,8 cm.

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“…Anna et al [ 10 ] designed a cost-effective compensation system based on a square Helmholtz coil and successfully used it for preliminary measurements of zero-field OPM (optically pumped magnetometers). Ramos et al [ 11 , 12 , 13 , 14 ] analyzed the uniformity of the volume away from the central axis and considered varying the spacing of different Helmholtz coils to expand the uniform field region. Panthinuan et al [ 15 , 16 , 17 ], on the other hand, designed different structures to improve the uniformity of the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of a Magnetization Drive Coil Based on the Helmholtz Principle and an Experimental Study

Zhao¹,

Lv²,

Yang³

et al. 2023

Micromachines

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In order to realize the magnetization of hydrogel mixed with NdFeB powder, a magnetization drive coil based on a Helmholtz coil is designed in this paper. The 3D model of the magnetic field system is drawn by the Maxwell software 3D module, and the influence of different factors on the magnetic induction intensity is analyzed to obtain the optimized structure of the magnetization drive coil; then, the central magnetic induction intensity and magnetic induction line distribution density of the magnetization drive coil and Helmholtz coil are compared to verify the reliability of the structure optimization. The results show that the central magnetic induction intensity is the highest when the distance between the auxiliary coils is 70 mm, the central magnetic induction intensity of the magnetized drive coil is significantly higher than that of the Helmholtz coil when the number of turns is the same, and the central magnetic induction intensity of the optimized magnetized drive coil can reach 1.37 T with a more uniform and dense magnetic induction line distribution. After building the magnetization drive coil, the magnetic induction intensity of the center of the magnetization drive coil can reach 1.34 T by a handheld digital Gauss meter test, and the error is no more than 2% with the simulation result. This design approach provides a reference for the structural design and operating characteristics analysis of magnetized drive coils and shortens the design cost and development cycle of magnetized drive coils.

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Helmholtz coils model as pulsed electromagnetic field therapy devices for fracture healing using comsol multiphysics

Cited by 6 publications

References 3 publications

Particulate Matter Detachment from a Magnetizable Single Fiber Applying Magnetic Forces in Ambient Air

Particulate Matter Detachment from a Magnetizable Single Fiber Applying Magnetic Forces in Ambient Air

Desain Alat Terapi Fraktur Berbasis Medan Elektromagnetik

Design and Simulation of a Magnetization Drive Coil Based on the Helmholtz Principle and an Experimental Study

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