Zulkifly, Aziz and Mohd Mawardi, Saari and Chin, S. Y. and Mohd Aufa Hadi, Putera Zaini and Nurul A'in, Nadzri (2020) Braiding uniform magnetic field inside a cylindrical reactor for photocatalytic reforming of petrochemical wastewater. In: IEEE International Conference on Emerging Technology in Computing, Communication and Electronics (ETCCE 2020), 2122 December 2020 , Bangladesh. pp. 12.. ISBN 9780738124018

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Abstract
Being routinely investigated, the coaxial coil pairs are known to exhibit a nearly flat magnetic field intensity in the central region. The Helmholtz coils is an example of such coil capable of producing uniform magnetic field, however its use in conjunction with inductive wireless power transfer in wastewater photoreforming has not been well explored. In this study, an optimum coil spacing for a Helmholtz pair is suggested and sought by analytical approach. Subsequently, a numerical solution is obtained for the magnetic flux density inside a cylindrical chamber of known radius and height by employing the finite element method. The axisymmetric nature of the model is exploited to reduce computation cost. The mean values are combined based on the method detailed in the Cochrane handbook to obtain an average magnetic flux density inside the cylinder and repeated to obtain an average value for 77 combinations of coil diameter and height. Linear and nonlinear regression techniques are applied to determine the relationship between the dependent variable and the independent variables. In contrast to the more common coil spacing of R, where R refers to the coil radius, a spacing of 1.5R is feasible which increase the maximum usable volume by a factor of 1.5 under acceptable deviation in flux density. Nonlinear transformation using the logarithmic model yield the best combination of 0.97/0.18 for the coefficient of determination and residual sum of squares, respectively. The technique demonstrated herein can be used to set up multiple Helmholtz coil geometry for farming a uniform magnetic field density in photoreforming of petrochemical wastewater by inductive wireless power transfer to multiple arbitrary LED based receivers.
Item Type:  Conference or Workshop Item (Lecture) 

Additional Information:  Indexed by Scopus 
Uncontrolled Keywords:  Photocatalytic oxidation; Circular coil; Homogenous flux density; Photoreforming; Helmholtz coil spacing 
Subjects:  T Technology > TK Electrical engineering. Electronics Nuclear engineering 
Faculty/Division:  Institute of Postgraduate Studies Faculty of Electrical and Electronic Engineering Technology 
Depositing User:  Mrs Norsaini Abdul Samat 
Date Deposited:  28 Apr 2021 05:11 
Last Modified:  28 Apr 2021 05:11 
URI:  http://umpir.ump.edu.my/id/eprint/31045 
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