Role of metallic and composite (ceramic–metallic) supports on microwave heating of porous dielectrics

Aparna, K.; Basak, Tanmay; Balakrishnan, A.

doi:10.1016/j.ijheatmasstransfer.2006.11.021

Cited by 22 publications

(15 citation statements)

References 27 publications

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“…111 Further investigations for other materials such as oil and beef samples reported that the supporting plate (ceramic and/ or metallic) may drastically alter the heating effects with a range of dielectric properties. 69,[112][113][114][115] It was observed that beef samples would exhibit greater thermal runaway especially with SiC plate in the presence of both sides distributed microwave incidence, whereas the oil samples would exhibit smaller thermal runaway effects with both sides equidistributed microwave incidence irrespective of any ceramic plates. 69,112 It was observed the average power absorption was enhanced for samples (beef-air and beef-oil) in presence of Al 2 O 3 support whereas the average power was smaller with SiC support for porous dielectric materials such as beef-air (b/a) and beef-oil (b/o).…”

Section: Microwave Heating Of Multiphase Systemsmentioning

confidence: 99%

“…0.45) whereas alumina-metallic composite support might be suitable for smaller porosities (/ 0.45) of b/a samples. 115 Similarly, microwave heating of oil-water emulsion were also carried out in presence of ceramic and metallic supports and it was found that SiC support was favored over alumina support due to the lesser thermal runaway for emulsion slabs. 116 Further, extensive studies have been carried out to investigate the role of metallic annulus on microwave heating of emulsion samples confined within 2D cylinders due to lateral and radial irradiations and provided a optimal heating strategy for any emulsion sample.…”

Section: Microwave Heating Of Multiphase Systemsmentioning

confidence: 99%

“…133 Basak and coworkers 114 carried out theoretical analysis on microwave heating of various porous food materials. The role of various supports such as ceramic 114 , metallic, and composite supports 115 on efficient heating of porous materials were investigated in presence of resonances. Jindarat and coworkers 134 analyzed energy consumption for microwave drying of porous material using a rectangular waveguide.…”

Section: 127mentioning

confidence: 99%

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Microwave material processing—a review

2011

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Microwave heating is caused by the ability of the materials to absorb microwave energy and convert it to heat. This article represents a review on fundamentals of microwave heating and their interaction with materials for various applications in a comprehensive manner. Experimental studies of single, multimode, and variable frequency microwave processing were reviewed along with their applications. Modeling of microwave heating based on Lambert's law and Maxwell's electromagnetic field equations have also been reviewed along with their applications. Modeling approaches were used to predict the effect of resonances on microwave power absorption, the role of supports for microwave heating, and to determine the nonuniformity on heating rates. Various industrial applications on thermal processing have been reviewed. There is tremendous scope for theoretical and experimental studies on the athermal effects of microwaves. Some of the unresolved problems are identified and directions for further research are also suggested.

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Section: Microwave Heating Of Multiphase Systemsmentioning

confidence: 99%

Section: Microwave Heating Of Multiphase Systemsmentioning

confidence: 99%

Section: 127mentioning

confidence: 99%

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Microwave material processing—a review

2011

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“…Two kinds of liquid are simulated in order to display physical phenomena of microwave heating in the liquid Table 1 The electromagnetic and thermo physical properties used in the computations (Ratanadecho et al 2002a,b andAparna et al 2007) Property…”

Section: Resultsmentioning

confidence: 99%

Experimental and Numerical Analysis of Microwave Heating of Water and Oil Using a Rectangular Wave Guide: Influence of Sample Sizes, Positions, and Microwave Power

Cha-um

Rattanadecho

Pakdee

2009

Food Bioprocess Technol

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The heating process of water and oil using microwave oven with rectangular wave guide is investigated numerically and experimentally. The numerical model is validated with an experimental study. The transient Maxwell's equations are solved by using the finite difference time domain method to describe the electromagnetic field in the wave guide and sample. The temperature profiles and velocity field within sample are determined by the solution of the momentum, energy, and Maxwell's equations. In this study, the effects of physical parameters, e.g., microwave power, the position of sample in wave guide, size, and thickness of sample, are studied. The results of distribution of electric field, temperature profiles, and velocity field are presented in details. The results show that the mathematical models are in agreement with the experimental data. Conclusively, the mathematical model presented in this study correctly explains the phenomena of microwave heating within the liquid layer. Keywords Microwave heating . Rectangular wave guide . Mode TE 10 . Maxwell's equation . FDTD method Nomenclature C p specific heat capacity [J/(kg K)] E electric field intensity (V/m) f frequency of incident wave (Hz) g gravitational constant (m/s 2 ) H magnetic field intensity (A/m) P power (W) p pressure (Pa) Q local electromagnetic heat generation term (W/m 3 ) s Poynting vector (W/m 2Greek letters α thermal diffusivity (m 2 /s) β coefficient of thermal expansion (1/K) η absolute viscosity (Pa s) ε permittivity (F/m) l wavelength (m) μ magnetic permeability (H/m) υ velocity of propagation (m/s) ν kinematics viscosity (m 2 /s) ρ density (kg/m 3 ) σ electric conductivity (S/m) ω angular frequency (rad/s) ξ surface tension (N/m)

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“…Wang and Chen (1999a;1999b;2000) published their numerical findings on low intensity convective drying, fixed bed drying and fluidized-bed drying of porous particles. Basak and his cooperators (Basak et al, 2006;Aparna et al, 2007;Samanta and Basak, 2009) were interested in numerical verification of the beneficial effects of metallic and composite (ceramic-metallic) supports on microwave heating of oil and/or meat. Wang and Chen (2003;2005a;2005b;2007b) paid much attention to the numerical examination of freeze-drying of various high value materials with (or without) microwave heating.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Mathematical Modeling of Heat and Mass Transfer in Fluidized-Bed Drying of Porous Material

Wang¹,

Wang²,

Pan³

et al. 2012

International Journal of Food Engineering

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A two-dimensional mathematical model of simultaneous heat and mass transfer for porous media drying was derived based on the Whitaker's theory in the present study. The cylindrical coordinate system, which is more practical than the spherical one, was adopted. The model was solved numerically under the circumstance of fluidized-bed drying. The control-volume method with the fully implicit scheme was applied for discretization of governing equations. Physical properties of apple were selected in the simulation. Under typical operating conditions, heat and mass transfer mechanisms were analyzed based on the profiles of temperature and saturation inside the particles. Effects of the temperature, humidity and inlet velocity of hot gas were examined under different operating conditions. Simulation results show that the drying process can be significantly affected by coupled heat and mass transfer between gas and solid phases. The drying time increases with the increase in temperature and velocity of inlet hot gas, and decreases with the increase in humidity and bed area factor.

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Role of metallic and composite (ceramic–metallic) supports on microwave heating of porous dielectrics

Cited by 22 publications

References 27 publications

Microwave material processing—a review

Microwave material processing—a review

Experimental and Numerical Analysis of Microwave Heating of Water and Oil Using a Rectangular Wave Guide: Influence of Sample Sizes, Positions, and Microwave Power

Two-Dimensional Mathematical Modeling of Heat and Mass Transfer in Fluidized-Bed Drying of Porous Material

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