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Current Progress in Magnetic Separation-Aided Biomedical Diagnosis Technology
Published in Nguyễn T. K. Thanh, Clinical Applications of Magnetic Nanoparticles, 2018
Sim Siong Leong, Swee Pin Yeap, Siew Chun Low, Rohimah Mohamud, JitKang Lim
Apart from that, Halbach array is also a possible magnet arrangement that can be implemented in magnetic separator for biomedical diagnosis. Halbach array is a special arrangement of magnets that is able to reinforce the magnetic field strength on one side of the array while weakening the magnetic field on the other side.85 The Halbach array involves selective arrangement of magnets in which the magnetization of the subsequent magnet is rotated at an angle of 90° in comparison to the previous magnet (Figure 10.13).88 Thus, by incorporating the Halbach array into the magnetic separator, the magnetic field can be significantly concentrated on the region where MS is intended to be carried out. By intensifying the magnetic field on the separation chamber (the domain where magnetophoresis is conducted), the separated rate can be greatly accelerated and the efficiency of the magnetic separator can be improved. Hoyos et al.89 have incorporated the Halbach array into a SPLITT magnetic separator, which displays improved efficiency as compared to conventional SPLITT magnetic separator. In their theoretical study, Babinec et al.90 also found that the separation time given by magnetic separator incorporated with Halbach array has been shortened by a factor of 25 in comparison to a simple block of permanent magnet. Thus, the Halbach array shows a huge potential to be implemented in magnetic separator for biomedical diagnosis as well as other applications.
Permanent Magnet Motors and Halbach Arrays
Published in Ranjan Vepa, Electric Aircraft Dynamics, 2020
A Halbach array, first introduced by Halbach [1], is an arrangement of magnets designed to enhance the magnetic flux in a certain domain. Figure 4.2 shows a linear array of permanent magnets designed to create a flux field on one side of the array and almost cancel the flux on the other side, except at the two ends of the arrangement. The magnetization pattern is indicated by the arrows in (a) and the flux field in (b).
Experimental investigations on the performance of a vapor compression refrigeration system under the influence of magnetic field generated using magnetic pair and Halbach array
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022
Rahul Deshmukh, Dinesh Zanwar, Sandeep Joshi, Shyamal Chakrabarty
A Halbach array is a special arrangement of permanent magnets kept side by side using an external force or binding energy in a definite orientation, such that it makes one side stronger with a higher Gauss level and another side with negligible magnetic field intensity. Magnets kept side by side with the same orientation show equal magnetic field strength on either side (Hilton and McMurry 2012; Shute et al. 2000). The important advantage of a Halbach array is that the magnetic field developed is strong on one side and nearly twice that of an individual magnet in the assembly (Attar et al. 2020). One such arrangement of the Halbach array is shown in Figure 2b, in which the arrow indicates the direction of the North Pole. Moreover, the planar and circular shape arrays have the same outcome (Shute et al. 2000). It has the only drawback that it is hard to assemble the magnets to form an array, as magnets placed side by side repels each other with very strong repulsive force and hence gives rise to a variety of fabrication issues (“Inc Benefits and Drawbacks to Using Halbach Arrays”).
Impact of magnetic field strength generated by Halbach array on hard water for solar applications
Published in International Journal of Ambient Energy, 2022
Ajaj Attar, M. Arulprakasajothi
A Halbach array is a distinct disposition of permanent magnets such that it forms a stronger magnetic field on one side of the array and diminishing the field on the other side to nearly zero. Orienting the magnets, such that they are out of the phase, can achieve this effect, usually by 90 degrees. This orientation re-channels the magnetic field below and above the structure as working and non-working surfaces, reinforcing the magnetic field of the working surface and reducing the field of the non-working surface to zero (Hilton and McMurry 2012).
Investigation of impact of the magnetic field through Halbach array on hydrocarbon fuel
Published in International Journal of Ambient Energy, 2022
Ajaj Attar, M. Arulprakasajothi, Deep Vasulkar, Nilesh Gorde, Soham Kharat, Siddhi Kulkarni
Physicist Klaus invented the Halbach array to concentre on particle beams, electrons and lasers, in the 1980s. A Halbach array is a peculiar arrangement of permanent magnets side by side in a specific orientation that makes one side of the magnetic field stronger and nearly cancelling the field on the other side. A normal magnet shows equal strength of magnetic field on either side (Hilton and McCurry 2012; Mallinson 1973).