Innovative induction heating technology based on transformer theory: Inner heating of electrolyte solution via alternating magnetic field

Jin, Yamei; Yang, Na; Xu, Xueming

doi:10.1016/j.applthermaleng.2020.115732

Cited by 18 publications

(6 citation statements)

References 23 publications

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“…Through preliminary experiments, a magnetic core was used to enhance the applied magnetic field, and then the thermal effect was observed. It indicated that magnetic field strength, sample winding, and sample conductivity are key factors for the heating [ 21 ].…”

Section: Methodsmentioning

confidence: 99%

“…Through preliminary experime magnetic core was used to enhance the applied magnetic field, and then the thermal was observed. It indicated that magnetic field strength, sample winding, and sampl ductivity are key factors for the heating [21]. Thus, the apparatus consisted of a power source (INDUC Scientific Co., Ltd., China), magnetic core, primary winding (N1 = 1, litz wire), secondary winding (N PC-ISO supporting spiral tube of sample pipeline, length: L = 750 cm, inner diamet 8 mm, and wall thickness: dw = 1.5 mm), sample bottle, pump, cooling system, and o scope.…”

Section: Apparatus Descriptionmentioning

confidence: 99%

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Novel Electromagnetic Heat Hydrodistillation for Extraction of Essential Oil from Tangerine Peel

Yang,

Jin

2024

Foods

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A novel electromagnetic heat method is presented for green extraction of natural compounds from peel residue. In the processing cavity obtained through 3D printing, a core made of amorphous alloy was applied to strengthen the magnetic flux. During the process, an induced electric field was produced in the extract medium owing to an oscillating magnetic field at 50 kHz rather than a pair of electrodes; thus, electrochemical reactions could be avoided. A thermal effect and temperature rise were observed under the field, and essential oil was obtained via this electromagnetic heat hydrodistillation. In addition, the numerical relationships between magnetic field, induced electric field (IEF), induced current density, and temperature profile were elaborated; they were positively correlated with the extraction yield of essential oils. It was found that the waveforms of the magnetic field, induced electric field, and excitation voltage were not consistent. Using a higher magnetic field resulted in high current densities and terminal temperatures in the extracts, as well as higher essential oil yields. When the magnetic field strength was 1.39 T and the extraction time was 60 min, the maximum yield of essential oil reached 1.88%. Meanwhile, conventional hydrodistillation and ohmic heating hydrodistillation were conducted for the comparison; all treatments had no significant impact on the densities. In addition, the essential oil extracted by electromagnetic heat had the lowest acid value and highest saponification value. The proportion of monoterpenoids and oxygen-containing compounds of essential oil extracted by this proposed method was higher than the other two methods. In the end, the development of this electromagnetic heat originating from magnetic energy has the potential to recover high-value compounds from biomass waste.

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Section: Methodsmentioning

confidence: 99%

Section: Apparatus Descriptionmentioning

confidence: 99%

Novel Electromagnetic Heat Hydrodistillation for Extraction of Essential Oil from Tangerine Peel

Yang,

Jin

2024

Foods

Self Cite

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“…In, EMGT the magnetic flux generation depends on the quantity of voltage supply to the coil. Generally, the presence of salt in the electrolyte increases the conductivity, also the magnetic flux creates the turbulence effect among electrolyte molecules and leads to the higher conductivity [35,36].…”

Section: Methodsmentioning

confidence: 99%

Enhancing MRR and accuracy with magnetized graphite tool in electrochemical micromachining of copper

Palaniswamy¹,

Seeniappan²,

Thanigaivelan

et al. 2023

CI&CEQ

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Micro hole is the fundamental feature found in any device/components. Hence this paper aims to produces the micro holes using electrochemical micromachining (EMM). The existing machining techniques in EMM for creating micro holes are associated with more overcut (OC). Hence, it is very essential to reduce OC and enhance the machining rate (MR). This paper aspires to investigate the effect of graphite electrode with magnetic force on copper plate. Four different tools namely electromagnetic graphite tool (EMGT), permanent magnet graphite tool (PMGT), graphite tool and stainless steel (SS) tool are employed for these experiments. The major influencing factors are machining voltage in volts, duty cycle in % and electrolyte concentration in g/l was considered on MR and OC. The results exposed that EMGT, PMGT and graphite electrodes produce MR of 106.4%, 74.6 % and 44.5 % over SS tool at parameter level of 23 g/l, 15 V, and 85% respectively. Graphite and EMGT electrode resulting in 11.9% and 3.41 % reduced OC respectively than SS tool at parameter level of 8V, 95% and 28 g/l. Additionally, scanning electron microscope (SEM) picture examination is conducted to identify the magnetic field effect on the work surface.

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“…When the alternating magnetic flux ( Φ ) vertically passes through the magnetic coupling tube coil, the induced electromotive force E 2 is generated therein. As the alternating magnetic flux ( Φ ) in the magnetic core is closed through the primary coil and the secondary coil, the induced electromotive force E 1 and E 2 [ 21 ] can be expressed as:

where f represents the applied frequency, N 1 and N 2 represent the turns of primary and secondary coils, respectively, and Φ represents alternating magnetic flux.…”

Section: Methodsmentioning

confidence: 99%

“…In a previous study, an innovative induction heating system was built [ 21 ] in which the inner heating of electrolyte solutions or liquid foods was observed. The induced voltage and temperature rise were also detected by Wu et al [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Saline Gel Coil for Inner Heating of Electrolyte Solution and Liquid Foods under Induced Electric Field

Zhang

Fan

Wang

et al. 2022

Foods

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As an emerging electrotechnology, induced electric field has attracted extensive attention in the development of innovative heat treatment equipment. In this study, a resistance heating unit based on induced electric field was built for inner heating of aqueous electrolyte solutions as well as liquid foods, such as vinegar. NaCl solutions and liquid foods with different conductivity were used to investigate the thermal effect and temperature rise of samples. Saline gel composed of 3% agar powder and 20% NaCl acted as a coil of conductor for inducing high-level output voltage. The utilization of the saline gel coil significantly improved the power conversion efficiency of the heating unit as well as the heating rate. The results revealed that duty cycle and applied frequency had immediate impact on the efficiency of inner heating. Additionally, the rate of temperature rise was proportional to the conductivity of the sample. The temperature of 200 mL NaCl solution (0.6%) increased from 25 °C to 100 °C in 3 min at 40% duty cycle and 60 kHz of applied frequency, and it was a circulating-flow process. The maximum temperature rise of black vinegar was 39.6 °C in 15 s at 60 kHz and 60% duty cycle, while that of white vinegar was 32.2 °C in 30 s under same conditions, whereas it was a continuous-flow process. This novel heating system has realized the inner heating of liquid samples.

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Innovative induction heating technology based on transformer theory: Inner heating of electrolyte solution via alternating magnetic field

Cited by 18 publications

References 23 publications

Novel Electromagnetic Heat Hydrodistillation for Extraction of Essential Oil from Tangerine Peel

Novel Electromagnetic Heat Hydrodistillation for Extraction of Essential Oil from Tangerine Peel

Enhancing MRR and accuracy with magnetized graphite tool in electrochemical micromachining of copper

Design of Saline Gel Coil for Inner Heating of Electrolyte Solution and Liquid Foods under Induced Electric Field

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