Computational characterization of millimetre-wave heat exchangers with an AlN:Mo susceptor of multiple cylindrical elements

Hogan, Catherine M.; Hoff, Brad W.; Rittersdorf, I. M.; Yakovlev, Vadim V.

doi:10.1080/08327823.2022.2029120

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…This algorithm implemented in the 3D FDTD simulator QuickWave [28] allows for determining the time evolution of the 3D temperature distribution. Examples of simulations of the heating processes are reported in [31], [32], [33], [34].…”

Section: B Multiphysics Simulations Of Temperature Evolutionmentioning

confidence: 99%

Solid-State Power Combining for Heating Small Volumes of Mixed Waste Materials

et al. 2023

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Microwave heating of waste results in chemical breakdown that can lead to conversion of mixed waste materials to fuel. Heating waste mixtures with microwave energy rather than incineration results in faster breakdown and can therefore be more efficient. Here we address heating of small volumes of mixed food waste materials with widely differing and temperature-dependent electrical properties. Uniform heating is accomplished with mode mixing within a loaded cavity and by spatial power combining of solid-state power amplifiers (SSPAs). We present a heating comparison of two circuit-combined and spatially-combined 2.45 GHz 70-W 65% efficient GaN SSPAs with controlled relative phase. The heating efficacy is shown to improve by volumetric combining inside the waste loading. The temperature changes in several locations and for several common waste materials and mixtures are investigated and compared to FEM electromagnetic simulations, as well as FDTD multi-physics simulations that incorporate thermal dependence of material properties. The approach is scalable in volume and power, demonstrated by a simulation comparison of the 1.4 L small cavity to a 5.2 L volume.INDEX TERMS Microwave heating, power amplifiers, efficiency, power combining, multi-physics modelling.This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination.

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Section: B Multiphysics Simulations Of Temperature Evolutionmentioning

confidence: 99%

Solid-State Power Combining for Heating Small Volumes of Mixed Waste Materials

et al. 2023

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Transverse electric-thermal-fluid instabilities in an electromagnetic heat exchanger

Mohekar

Tilley

Yakovlev

2023

International Journal of Heat and Mass Transfer

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Resonance, Rayleigh flows, and thermal choking: Compressible coolant states in porous electromagnetic heat exchangers

Mohekar

Tilley

Yakovlev

2023

Journal of Applied Physics

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Electromagnetic (EM) heat exchangers (HX) are systems that convert EM energy into heat or mechanical work. One potential design consists of a porous lossy ceramic material heated by EM waves with a compressible gas coolant. EM heating of ceramics is nonlinear, since the loss factor is temperature dependent. Designing such EM HXs requires an understanding of coupling between temperature, the electric field, and gas dynamics at the pore scale. To mimic this microscale phenomenon, a single channel with a high-speed gas coolant in perfect thermal contact with a thin solid ceramic layer is considered, with an applied plane-wave electric field propagating normal to the channel walls. From a thin-domain asymptotic analysis, the conservation laws reduce to a Rayleigh flow in the gas coupled with averaged thermal energy conservation equations at leading order. The model predicts that the kinetic energy of the gas increases up to 12.5 times the inlet value when thermal runaway occurs in the ceramic region for the cases considered, and thermal choking is possible when the coolant reaches the sonic state. Local maxima of efficiency occur on a discrete set of ceramic thicknesses that correspond to Fabry–Bragg resonances of the electric field.

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Computational characterization of millimetre-wave heat exchangers with an AlN:Mo susceptor of multiple cylindrical elements

Cited by 4 publications

References 27 publications

Solid-State Power Combining for Heating Small Volumes of Mixed Waste Materials

Solid-State Power Combining for Heating Small Volumes of Mixed Waste Materials

Transverse electric-thermal-fluid instabilities in an electromagnetic heat exchanger

Resonance, Rayleigh flows, and thermal choking: Compressible coolant states in porous electromagnetic heat exchangers

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