A numerical and experimental investigation of the modelling of microwave melting of frozen packed beds using a rectangular wave guide

Ratanadecho, Phadungsak; Aoki, Kazuo; Akahori, Masatoshi

doi:10.1016/s0735-1933(01)00279-2

Cited by 16 publications

(27 citation statements)

References 46 publications

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“…Ratanadecho and coworkers [13][14][15] used a TE 10 mode microwave system operating at a frequency of 2.45 GHz, for the applications of melting frozen packed beds 13,14 and drying of multilayered capillary porous materials. 15,16 Figure 1 shows the experimental setup for microwave of TE 10 mode operating at a frequency of 2.45 GHz.…”

Section: Single-mode Microwave Applicators and Applicationsmentioning

confidence: 99%

“…15,16 Figure 1 shows the experimental setup for microwave of TE 10 mode operating at a frequency of 2.45 GHz. 13 It was found that the direction of microwave melting of frozen packed beds (water and ice) strongly depend on the structure of layered packed beds due to the difference between dielectric properties of water and ice. 13,14 Moreover, in drying of multilayered capillary porous materials such as glass bead and water, the variation in particle size and initial moisture content influenced the degree of penetration and the rate of microwave power absorbed within the sample.…”

Section: Single-mode Microwave Applicators and Applicationsmentioning

confidence: 99%

“…13 It was found that the direction of microwave melting of frozen packed beds (water and ice) strongly depend on the structure of layered packed beds due to the difference between dielectric properties of water and ice. 13,14 Moreover, in drying of multilayered capillary porous materials such as glass bead and water, the variation in particle size and initial moisture content influenced the degree of penetration and the rate of microwave power absorbed within the sample. 15,16 Similarly, Antti and Perre 17 used single-mode microwave for drying of wood samples and they found that the power distribution differs between dry wood and moist wood, as dry wood absorbed less energy than moist wood.…”

Section: Single-mode Microwave Applicators and Applicationsmentioning

confidence: 99%

“…Figure 6 shows the analytical model for melting of frozen packed beds. 13 The boundary conditions for the heat transport equation were assumed to be of perfectly insulated boundary layers (Eq. 18) and the Stefan's equation was used to describe the moving boundary between unfrozen layer and frozen layer (Eq.…”

Section: @Hmentioning

confidence: 99%

“…5, 7, and 18-21 can be solved numerically with appropriate boundary conditions by finite volume or finite element method. 13,14 Drying of Unsaturated Porous Material. The transport mechanisms involved in the microwave drying of unsaturated porous material are: liquid flow due to capillary pressure gradient and gravity, and vapor flow due to the partial pressure gradient.…”

Section: 14mentioning

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: Single-mode Microwave Applicators and Applicationsmentioning

confidence: 99%

Section: Single-mode Microwave Applicators and Applicationsmentioning

confidence: 99%

Section: Single-mode Microwave Applicators and Applicationsmentioning

confidence: 99%

Section: @Hmentioning

confidence: 99%

Section: 14mentioning

confidence: 99%

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Microwave material processing—a review

2011

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Effect of sample size on microwave power absorption within dielectric materials: 2D numerical results vs. closed‐form expressions

Curet¹,

Rouaud²,

Boillereaux³

2009

AIChE Journal

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This study deals with the analytical and numerical solutions of the heat source term because of microwave heating for high and low dielectric materials in 1D and 2D configurations. The authors compare closed-form expressions dedicated to microwave power calculation to numerical simulations. A comprehensive and accurate analysis of the microwave power reflected from the surface of the sample is also carried out during microwave heating. The influence of sample length is studied using an original numerical procedure. The study highlights that 1D closed-form expressions can be extended to 2D configurations in the case of sufficiently high dielectric properties. Examples of heating rate during 2D microwave heating in TE 10 mode are finally presented. V

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Heat and mass transfer during microwave‐convective drying

2009

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The article presents a mathematical model of drying that describes the kinetics of combined microwave-convective drying for the process as a whole. Based on this model, the drying curves and the temperature evolutions of the drying body were constructed by a number of computer-simulated drying programs, which were chosen to follow the respective experimental processes carried out on a cylindrical sample made of kaolin. The experimental data allowed both the estimate of material coefficients arising in the model and the validation of the theory. A very satisfactory correlation of the theoretical predictions with the experimental data is found. The main novelty of this article is the mathematically complete drying model that describes all periods of the microwave-convective drying process. Application of such a complete model is necessary if we want to optimize drying processes with respect to drying time and consumption of energy via computer simulations.

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A numerical and experimental investigation of the modelling of microwave melting of frozen packed beds using a rectangular wave guide

Cited by 16 publications

References 46 publications

Microwave material processing—a review

Microwave material processing—a review

Effect of sample size on microwave power absorption within dielectric materials: 2D numerical results vs. closed‐form expressions

Heat and mass transfer during microwave‐convective drying

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