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Electromagnetic Simulation Using The Fdtd Method

Investigation on the effects of wall thickness and porous media on the thermal performance of a non-premixed hydrogen fueled cylindrical micro combustor

Many-body physics aims to understand emergent properties of systems made of many interacting objects. This article reviews recent progress on the topic of radiative heat transfer in many-body systems consisting of thermal emitters interacting in the near-field regime. Near-field radiative heat transfer is a rapidly emerging field of research in which the cooperative behavior of emitters gives rise to peculiar effects which can be exploited to control heat flow at the nanoscale. Using an extension of the standard Polder and van Hove stochastic formalism to deal with thermally generated fields in $N$-body systems, along with their mutual interactions through multiple scattering, a generalized Landauer-like theory is derived to describe heat exchange mediated by thermal photons in arbitrary reciprocal and non-reciprocal multi-terminal systems. In this review, we use this formalism to address both transport and dynamics in these systems from a unified perspective. Our discussion covers: (i) the description of non-additivity of heat flux and its related effects, including fundamental limits as well as the role of nanostructuring and material choice, (ii) the study of equilibrium states and multistable states, (iii) the relaxation dynamics (thermalization) toward local and global equilibria, (iv) the analysis of heat transport regimes in ordered and disordered systems comprised of a large number of objects, density and range of interactions, and (v) the description of thermomagnetic effects in magneto-optical systems and heat transport mechanisms in non-Hermitian many-body systems. We conclude this review by listing outstanding challenges and promising future research directions.

Near-field radiative heat transfer in many-body systems

Compact Design of Planar Stepped Micro Combustor for Portable Thermoelectric Power Generation

Recent progress in flame stabilization technologies for combustion-based micro energy and power systems

Numerical investigation of a novel micro combustor with double-cavity for micro-thermophotovoltaic system

A simple measurement method of temperature and emissivity of coal-fired flames from visible radiation image and its application in a CFB boiler furnace

Based on a flame-image processing technology, a real-time combustion-monitoring system with 3-D temperature reconstruction and visualization installed in a coal-fired furnace of a power plant was reported. A dozen of flame detectors with charge-coupled-device cameras were mounted along the height of the furnace to capture multiple digital flame images. A radiation energy signal (RES) was obtained from the flame images according to Wien's law of radiation. A series of in situ experiments have been done, and the results showed that the flame temperature distribution and the RES are sensitive to change in the combustion of the boiler and can be used to improve the combustion control in practical application.

A Combustion-Monitoring System With 3-D Temperature Reconstruction Based on Flame-Image Processing Technique

A computational fluid dynamics (CFD) model of a 200 MW multifuel tangentially fired boiler has been developed using Fluent 6.3.26, which is able to model the three-fuel combustion system of coal, b...

Numerical Simulation of Multifuel Combustion in a 200 MW Tangentially Fired Utility Boiler

Active control of radiative heat transfer still remains open due to its exciting application potential. In view of this, we present a theoretical demonstration of dynamically tunable near-field radiative heat transfer (NFRHT) between two multilayer hyperbolic metamaterials (consisting of alternating layers of a magneto-optical (MO) material and a dielectric) using an external magnetic field. We show that magnetization-induced hyperbolic modes play a significant role in radiative heat transfer and allow a highly tunable heat flux. Moreover, the hybridization of intrinsic and magnetization-induced hyperbolic modes significantly enhances the radiative heat transfer. In particular, we find that polarization conversion due to nonzero off-diagonal elements enables the spectral heat transfer coefficient for the TE polarization to be as large as that for the TM polarization, which is vastly different from the case of two closely spaced bulk MO plates. In addition, to quantitatively characterize the thermal modulation, we show a negative thermal magnetoresistance effect in this system, which approaches $\ensuremath{-}59.6\mathrm{%}$ when the magnetic field intensity reaches 10 T. Our findings may be beneficial for active noncontact thermal management at the nanoscale, and facilitate a deeper understanding of the mechanisms of MO hyperbolic metamaterials in terms of NFRHT.

Zixue Luo

Papers

Numerical investigation of a novel micro combustor with double-cavity for micro-thermophotovoltaic system

A simple measurement method of temperature and emissivity of coal-fired flames from visible radiation image and its application in a CFB boiler furnace

A Combustion-Monitoring System With 3-D Temperature Reconstruction Based on Flame-Image Processing Technique

Numerical Simulation of Multifuel Combustion in a 200 MW Tangentially Fired Utility Boiler

Magnetically Tunable Near-Field Radiative Heat Transfer in Hyperbolic Metamaterials