Study of microwave heating of reference liquids in a coaxial waveguide reactor using the experimental, semi-analytical and numerical means

Kapranov, Sergey V.; Kouzaev, Guennadi A.

doi:10.1016/j.ijthermalsci.2019.03.023

Cited by 24 publications

(9 citation statements)

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“…Because the signal is optical, there is no electrical risk to the patient, and there is no direct interference from surrounding electric or magnetic fields. Kapranov and Kouzaev [48] justified that IR and fiber optic sensors may be more reliable measurements at powers of 10W. For this the reason, a non-interfering thermometry system that comprises four Luxtron fiber-optic thermal probes, a fluoroptic thermometer (M3300) was used to measure the real-time temperature during the microwave ablation (MWA) experiments.…”

Section: Experimental Measurementsmentioning

confidence: 99%

Heat Transfer Study in Breast Tumor Phantom during Microwave Ablation: Modeling and Experimental Results for Three Different Antennas

et al. 2020

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It is worldwide known that the most common type of cancer among women is breast cancer. Traditional procedures involve surgery, chemotherapy and radiation therapy; however, these treatments are invasive and have serious side effects. For this reason, minimally invasive thermal treatments like microwave ablation are being considered. In this study, thermal behavior of three types of slot-coaxial antennas for breast cancer microwave ablation is presented. By using finite element method (FEM), all antennas were modeled to estimate the heat transfer in breast tumor tissue surrounded by healthy breast tissue. Experimentation was carried out by using the antennas inserted inside sphere-shaped-tumor phantoms with two different diameters, 1.0 and 1.5 cm. A microwave radiation system was used to apply microwave energy to each designed antenna, which were located into the phantom. A non-interfering thermometry system was used to measure the temperature increase during the experimentation. Temperature increases, recorded by the thermal sensors placed inside the tumor phantom surrounded by healthy breast phantom, were used to validate the FEM models. The results conclude that, in all the cases, after 240 s, the three types of coaxial slot antenna reached the temperature needed produce hyperthermia of the tumor volume considered in this paper.

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Section: Experimental Measurementsmentioning

confidence: 99%

Heat Transfer Study in Breast Tumor Phantom during Microwave Ablation: Modeling and Experimental Results for Three Different Antennas

et al. 2020

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“…The microwave-assisted chemistry is performed in a vessel inserted onto microwaves ovens [17], [18], [19], or these vessels can be the ovens themselves [20], [21], [22]. Then, the shape of these vessels influences the EM field and temperature distribution, liquids dynamics, and the pointdefined chemical reaction rate.…”

Section: Simulation Algorithm For the Electron Transfer Reaction Rate In Microwave Reactorsmentioning

confidence: 99%

“…It is seen the complexity of this multi-physical problem ( 8)-( 12), in spite of employing the analytical expression (12) for the rate coefficient K . Usually, these equations are solved, taking an iteration algorithm with multiple steps in the solutions of them [20]. Another technique is the use of "analytical shapes" of vessels allowing rather simple expressions for EM and other fields [20], [21].…”

Section: Simulation Algorithm For the Electron Transfer Reaction Rate In Microwave Reactorsmentioning

confidence: 99%

“…Usually, these equations are solved, taking an iteration algorithm with multiple steps in the solutions of them [20]. Another technique is the use of "analytical shapes" of vessels allowing rather simple expressions for EM and other fields [20], [21]. An essential simplification of calculations is available for the micro-sized vessels providing homogeneous distributions of temperature fields inside reactors, etc.…”

Section: Simulation Algorithm For the Electron Transfer Reaction Rate In Microwave Reactorsmentioning

confidence: 99%

“…Otherwise, these reagents and chemical dynamics can influence the reaction outcome, and microwave irradiation should be applied controllable in its power and frequency. For this purpose, more serious attention should be paid on measurements of liquid permittivities during the microwave-assisted heating and chemical reactions [20], [24].…”

Section: Estimation Of Frequency and Temperature Dependence Of The Electron Transfer Rate Coefficientmentioning

confidence: 99%

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Frequency dependence of microwave-assisted electron-transfer chemical reactions

Kouzaev

2019

Molecular Physics

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In this paper, the electron transfer reactions in microwave irradiation field are considered. A theory is developed for these reactions in reactors filled by a mix of reagents and a polar frequencydispersive and lossy solvent. This mix is described by a system of non-linear differential equations for nonstationary microwave field, heat, liquid dynamics, and chemical molecular kinetics that can be solved in full only numerically. In this paper, a particular solution of this system for the normalized chemical reaction rate coefficient k K A = with A as the pre-exponent factor is considered for the isothermic reactions for a given temperature T and frequency-temperature dependent complex dielectric permittivity ( )It is found that for small normalized free reaction energy 0, the chemical reactions are supported in a wide frequency band with an increased rate coefficient close to the unit. At higher values of this energy, these reactions are initiate only by heating with a small increase in the frequency bandwidth of reactions. The restrictions of the given theory are considered, and further experimental and semi-classical and quantum-mechanical studies are found important for practical application of these findings.

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