Numerical Model of Microwave Driven Convection in Multilayer Porous Packed Bed Using a Rectangular Waveguide

Klinbun, Waraporn; Rattanadecho, Phadungsak

doi:10.1115/1.4005254

Cited by 10 publications

(9 citation statements)

References 38 publications

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“…That same year, they published a second paper [111] , in which they numerically studied the heating of a multilayer porous packed bed that was subjected to microwave radiation with a rectangular waveguide.…”

Section: Non-thermal Equilibrium Model For Microwave Dryingmentioning

confidence: 99%

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Microwave-Assisted Drying: A Review of the State-of-the-Art

2015

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Offering advantages of energy-saving rapid drying rates, short processing times, deep penetration of the microwave energy, instantaneous and precise electronic control, as well as clean heating processes, microwave-assisted drying (MWD) has become a popular method that is currently used for many materials and processes. This paper presents a systematic and comprehensive review of experimental and theoretical studies regarding the kinetic mechanisms of MWD. Factors affecting, methods for measuring, and applications of the dielectric property are discussed. From the experimental perspective, laboratory-and commercial-scale MWD systems are elaborated, including the equipment used and the stability, safety, and regulation of MWD systems. Theoretical investigations of thermal and non-thermal equilibrium models and moving-load computational models are discussed. Finally, some future trends in the research and development of MWD systems are suggested. Downloaded by [University of Otago] at 16:52 21 July 2015 2

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Section: Non-thermal Equilibrium Model For Microwave Dryingmentioning

confidence: 99%

“…44 and 45. These studies [110][111][112] can be used to extend MWD modeling and have been continuously developing by the authors.…”

Section: Non-thermal Equilibrium Model For Microwave Dryingmentioning

confidence: 99%

Microwave-Assisted Drying: A Review of the State-of-the-Art

2015

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“…The results showed that the variation of particle sizes and initial moisture content influences the degree of penetration and rate of microwave power absorbed within the sample. In turn, the effects of layered configuration, layered thickness, and operating frequency in different packed beds were numerically investigated in [6]. It was demonstrated that all these parameters have significant effect on temperature profiles in the packed bed.…”

Section: Introductionmentioning

confidence: 99%

“…Two main approaches are applied in mathematical modelling to quantify the heat produced within a material due to microwaves: Maxwell's equations [3][4][5][6][7][8] and the Lambert's law [13][14][15][16][17][18][19]. While the former approach leads to determination of the spatial distribution of electromagnetic field, the latter one assumes an exponential decay of microwave power in the heated material.…”

Section: Introductionmentioning

confidence: 99%

“…The coupling is a consequence of the temperature dependence of the dielectric properties. The FDTD method is frequently used to solve Maxwell's equations [3][4][5][6][7][8][9][10][11][12]. As the time scale for an integration of Maxwell's equations at microwave frequencies is many orders of magnitude lower than the time scale for an integration of energy equation, an iterative procedure has to be established.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulations of heat transfer in a packed column: comparison of microwave and convective heating

Cherbański

2014

Heat Mass Transfer

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This paper presents a comparative study on heat transfer in a packed column. Two methods of heating are considered: microwave and convective. Transient onedimensional mathematical models were proposed to describe the both alternatives. To account for significant differences in the temperatures between the gas and solid phase a heterogeneous model was applied in the modelling. The numerical simulations were carried out for different operating conditions. The effects of the gas inlet temperature and the microwave power, the bed porosity, the penetration depth of microwaves and the gas velocity were examined. The simulation results were compared on the basis of the time profiles of the average bed temperature and the outlet gas temperature. The same electric power utilized in the microwave heated packed column and the convective heated packed column was established as the key criterion for the comparisons. The compared profiles intersect indicating the time ranges in which the one or the other solution provides higher temperature of the bed. It was displayed that the microwave heated packed column should be preferred when longer heating times are required. In turn, the convective heated packed column is the better choice when shorter heating times are needed.

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Flow control with electrode bank arrangements by electrohydrodynamics force for heat transfer enhancement in a porous medium

Ayuttaya¹,

Chaktranond

Rattanadecho

2018

Heat Trans. Asian Res.

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Active flow control with electrohydrodynamics (EHD) force in the channel flow has been numerically investigated for enhancing heat transfer. This study focuses on the effect of electrode bank arrangements and the number of electrodes on corona wind and fluid flow for heat transfer onto a porous medium. Aligned and staggered configurations of electrode banks are compared. The numerical results show that electric field intensity depends on electrical voltage and the number of electrodes. Shear flow is increased with larger numbers of electrodes and in the aligned configuration, resulting in the enhancement of vortex strength. The swirling flow from staggered configurations spread wider than that of aligned configurations, but the aligned configuration produced more turbulence. In addition, the temperature distribution in the channel flow is increased with increasing numbers of electrodes. With the effect of swirling flow, airflow above the porous sample surface is faster leads the heat to more transfer to the porous sample surface. This causes the temperature of porous medium to increase rapidly so the convective heat transfer coefficient on porous medium surface is increased. Finally, the modified case of the numerical results is validated against the experimental results. The experimental flow visualization is based on the incense smoke technique, in order to verify the accuracy of the swirling flow pattern subjected to the electric field. It is shown that the comparison results in both techniques are in good agreement.

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Numerical Model of Microwave Driven Convection in Multilayer Porous Packed Bed Using a Rectangular Waveguide

Cited by 10 publications

References 38 publications

Microwave-Assisted Drying: A Review of the State-of-the-Art

Microwave-Assisted Drying: A Review of the State-of-the-Art

Numerical simulations of heat transfer in a packed column: comparison of microwave and convective heating

Flow control with electrode bank arrangements by electrohydrodynamics force for heat transfer enhancement in a porous medium

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