One-Dimensional Model of Heat and Mass Transports and Pressure Built Up in Unsaturated Porous Materials Subjected to Microwave Energy

Sungsoontorn, Sopida; Rattanadecho, Phadungsak; Pakdee, Watit

doi:10.1080/07373937.2010.483029

Cited by 22 publications

(17 citation statements)

References 22 publications

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“…[92] Downloaded by [University of Otago] at 16:52 21 July 2015 . [93] Figure 31. Schematic diagram of the heating process, with boundary conditions.…”

Section: Discussionmentioning

confidence: 97%

“…The boundary condition at a closed impermeable boundary (i.e., symmetric, without heat or mass exchange) can be described by the following equations: Sungsoontorn et al [93] proposed three-variable model by focusing on the microwave frequency, particle size, and electric-field intensity, to predict the heat and mass transfer and pressure build-up profiles in unsaturated porous media subjected to microwave energy. They employed a 1D analytical model for the MWD of the sample, utilizing Eqs.…”

Section: Impermeable Surfacementioning

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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“…[92] Downloaded by [University of Otago] at 16:52 21 July 2015 . [93] Figure 31. Schematic diagram of the heating process, with boundary conditions.…”

Section: Discussionmentioning

confidence: 97%

Section: Impermeable Surfacementioning

confidence: 99%

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

2015

Self Cite

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“…At high frequencies, more energy was absorbed which causes high rate of moisture transfer. 62 Later, Suwannapum and Rattanadecho 138 presented a 2-D model for microwave heating of unsaturated porous materials (glass beads, water and air) and they showed that the particle size and thickness of porous packed bed play a major role to determine the heat and mass transfer during multiphase flow. Thick packed bed consists of more water than thin packed bed and hence it requires more thermal energy to evaporate moisture.…”

Section: 127mentioning

confidence: 98%

“…Sungsoontorn et al 62 proposed a 1-D model for heat and mass transfer and pressure buildup in unsaturated porous media (glass beads, water and air) using microwave energy. They found that the moisture transport near the heated edge of the sample was higher for high frequency that for lower frequencies.…”

Section: 127mentioning

confidence: 99%

“…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. 61,62 Figure 7 depicts the analytical model for the microwave drying process. 61 The assumptions involved in the transport model are that the capillary porous material is rigid with no chemical reactions occurring in the sample, local thermodynamic equilibrium prevails, simultaneous heat, and mass transfer occur at constant pressure and nonthermal microwave effects are negligible.…”

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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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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One-Dimensional Model of Heat and Mass Transports and Pressure Built Up in Unsaturated Porous Materials Subjected to Microwave Energy

Cited by 22 publications

References 22 publications

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

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

Microwave material processing—a review

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

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