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PDF Heat and mass transfer in twophase porous

PDF Heat and mass transfer in twophase porous

Keywords porous media model, intermittent microwave, drying, heat and mass transfer. Abstract. Combining microwave with convective drying can significantly reduce drying time, improve energy efficiency and product quality during drying. However, continuous application of

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Sublimationcondensation phenomenon in microwave freezedrying

Sublimationcondensation phenomenon in microwave freezedrying

May 10, 2007 In this paper, we study numerically two-dimensional heat and mass transfer during convective drying in porous media. The set of macroscopic equations is very comprehensive and takes into account the effect of gaseous pressure. A numerical code has been established.

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The Effects of SublimationCondensation Region on Heat

The Effects of SublimationCondensation Region on Heat

14 carried out theoretical analysis on conjugate heat and mass transfer on microwave freeze drying. Although their model is based on detailed analysis on heat and mass trans-port for drying within particles, the microwave energy is weakly coupled within the porous material. Heat and mass transfer models were also developed by Dincov et al ...

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Multiphase porous media model for heat and mass

Multiphase porous media model for heat and mass

Theoretical or Mathematical, Experimental/ capillarity diffusion drying microwave heating moisture particle size porous materials/ microwave drying unsaturated porous material moisture content vapor diffusion capillary flow electric field heat-mass transport equations particle size penetration absorbed energy rate bead size capillary forces ...

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Modeling and numerical simulation of simultaneous heat

Modeling and numerical simulation of simultaneous heat

Aug 24, 2009 Heat and mass transfer during microwaveconvective drying. Stefan J. Kowalski. Corresponding Author. E-mail address Stefan.J.Kowalskiput.poznan.pl. Dept. of Process Engineering, Institute of Technology and Chemical Engineering, Pozna University of

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THREEDIMENSIONAL MODEL FOR HEAT AND MASS TRANSFER

THREEDIMENSIONAL MODEL FOR HEAT AND MASS TRANSFER

The interrelated system of heat-and moisture-transfer and electrodynamic equations for modeling superhigh-frequency drying of capillary-porous materials has been formulated. An example of solving the problem of heat and moisture transfer in microwave heating of a wood sample with allowance for the influence of surface forces on the process of migration of moisture has been given.

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Microwave Drying of Food and Agricultural Materials

Microwave Drying of Food and Agricultural Materials

Aug 01, 1998 The calculations show that the saturation of ice in the sublimation-condensation region will obviously decrease, and its effects on heat and mass transfer cannot be neglected for microwave freeze-drying of unsaturated porous media. The microwave freeze-drying tests of

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Heat and mass transfer modeling for fruit drying a

Heat and mass transfer modeling for fruit drying a

action between microwave energy and heatmass transfer 70 of porous material, such as microwave heating and drying process.8,1420 Additionally, most previous works have not mentioned two-dimensional pressure buildup and ow eld inside porous materials with varying particle sizes. A recent work carried out a systematic investigation ...

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Two Dimensional Heat and Mass Transfer During Convective

Two Dimensional Heat and Mass Transfer During Convective

Aug 02, 2019 Heat and Mass Transfer in Drying of Porous Media offers a comprehensive review of heat and mass transfer phenomena and mechanisms in drying of porous materials. It covers pore-scale and macro-scale models, includes various drying technologies, and discusses the drying dynamics of fibrous porous material, colloidal porous media and size-distributed particle system.

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Fundamentals of Drying of CapillaryPorous Bodies

Fundamentals of Drying of CapillaryPorous Bodies

A sublimation-condensation model is developed for microwave freeze-drying of unsaturated porous media. The transport properties in the model are analyzed and the model is calculated numerically for the microwave freezedrying of unsaturated porous media. The results show that the effects of sublimation-condensation region on drying processes are significant as compared with the traditional ...

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Numerical Simulation of the Heat Mass and Momentum

Numerical Simulation of the Heat Mass and Momentum

Thermo-uid dynamic theory of two-phase ow. element modeling of heat and mass transfer in food materials Eyrolles, Book Publication. during microwave heatingmodel development and validation. Lyins, D. W., Hatcher, J. D. (1972). Drying of a porous medium Journal

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Analysis of HeatMass Transport and Pressure Buildup

Analysis of HeatMass Transport and Pressure Buildup

Jan 24, 2012 Feng H, Tang J, Cavalieri RP, Plumb OA (2001) Heat and mass transport in microwave drying of porous materials in a spouted bed. AIChE J 4714991512. CAS Article Google Scholar 38. Feng H (2002) Analysis of microwave assisted fluidized-bed drying of particulate product with a simplified heat and mass transfer model.

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Heat and Mass Transfer in Drying of Porous Media 1st

Heat and Mass Transfer in Drying of Porous Media 1st

Hong Thai Vu, Evangelos Tsotsas, Mass and Heat Transport Models for Analysis of the Drying Process in Porous Media A Review and Numerical Implementation, International Journal of Chemical Engineering, 10.1155/2018/9456418, 2018, (1-13), (2018).

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The effects of sublimationcondensation region on heat and

The effects of sublimationcondensation region on heat and

cations and other food processing where heat and mass transfer takes place in porous media with signicant evaporation and other phase change. Introduction Food process modelling is a very complex due its intricate phys-ical structure. There are many modelling efforts in food pro-cesses such as drying 1, 6, 10, frying 13, microwave heat-

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Simultaneous transfer of heat and moisture in porous media

Simultaneous transfer of heat and moisture in porous media

The calculations show that the saturation of ice in the sublimation-condensation region will obviously decrease, and its effects on heat and mass transfer cannot be neglected for microwave freeze-drying of unsaturated porous media. The microwave freeze-drying tests of unsaturated beef are carried out.

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Eect of ceramic supports on microwave processing of

Eect of ceramic supports on microwave processing of

The modeling and numerical simulation of drying in porous media is discussed in this work by revisiting the different models of moisture migration during the drying process of porous media as well as their restrictions and applications. Among the models and theories, we consider those are ranging from simple ones like the diffusion theory to more complex ones like the receding front theory ...

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Analysis of heat and mass transfer during microwave drying

Analysis of heat and mass transfer during microwave drying

Aug 24, 2009 The total heat flux expressed by relation (17) consists of the heat conducted to the moist porous body (being proportional to the gradient of temperature assuming Fouriers law) and of the heat transported with the mass flux J (heat convection) is the coefficient of thermal conductivity (a material constant).

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Convective and Microwave Assisted Drying of Wet

Convective and Microwave Assisted Drying of Wet

Key words microwave drying, wood, heat and mass transfer, porous media, modelling. Introduction . Drying is the most energy-intensive and time-consuming component of the lumber manufacturing process. The most of the technic used to dry wood is the conventional and vent kilns, where hot and dry air is used. This technic is simple and inexpensive.

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Heat and Mass Transfer in Drying of Porous Media Peng

Heat and Mass Transfer in Drying of Porous Media Peng

Home Journals Journal of Porous Media Volume 21, 2018 Issue 10 THREE-DIMENSIONAL MODEL FOR HEAT AND MASS TRANSFER DURING CONVECTIVE DRYING OF WOOD WITH MICROWAVE HEATING Journal of Porous Media Editor-in-Chief Kambiz Vafai

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Mass and Heat Transport Models for Analysis of the Drying

Mass and Heat Transport Models for Analysis of the Drying

The advantages of microwave drying include the following shorter drying time, improved product quality, and flexibility in producing a wide variety of dried products. Drying is influenced by heat and mass transfer between drying airflow and product, as well as the complex moisture transport processes which take place in the product..

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Mathematical Modelling of Heat and Mass Transfer

Mathematical Modelling of Heat and Mass Transfer

Oct 28, 2020 the convective heat and mass transfer coe cients and microwave power intensity, the faster the solid will dry and heat up. Keywords drying microwave convective prolate spheroid simulation 1. Introduction Porous materials are a class of materials composed by a solid matrix with interconnected and

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Heat and mass transfer in twophase porous materials

Heat and mass transfer in twophase porous materials

This chapter presents a review of some theoretical, numerical and experimental studies published during the last decade on simultaneous heat and mass transfer, including moisture transport, as they appear during the drying of capillary-porous bodies. It emphasizes on progress made in the foundation of the mathematical modelling using the rational averaging approach and focusses on research ...

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Convective and Microwave Assisted Drying of Wet Porous

Convective and Microwave Assisted Drying of Wet Porous

Mar 31, 2021 Book Description. Heat and Mass Transfer in Drying of Porous Media offers a comprehensive review of heat and mass transfer phenomena and mechanisms in drying of porous materials. It covers pore-scale and macro-scale models, includes various drying technologies, and discusses the drying dynamics of fibrous porous material, colloidal porous media and size

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MODEL OF NONEQUILIBRIUM DRYING HOLLOW CYLINDRICAL POROUS

MODEL OF NONEQUILIBRIUM DRYING HOLLOW CYLINDRICAL POROUS

Therefore, the drying process with microwave was analyzed in the present study, showing that microwave heating can accelerate the drying process, and that the overheating effect caused by pressure drop is dominant when 1200 s, but when over this critical time microwave heating is the only driving force mechanism of phase change in the ...

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Experimental and numerical study of microwave drying in

Experimental and numerical study of microwave drying in

Convective heating is a traditional method used for the drying of wet porous materials. Currently, microwave drying has been employed for this purpose, due to its excellent characteristics of uniform moisture removal and heating inside the material, higher drying rate, and low energy demand. This paper focuses on the study of the combined convective and microwave drying of porous solids with ...

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COMPUTATIONAL ANALYSIS OF HEAT AND MASS

COMPUTATIONAL ANALYSIS OF HEAT AND MASS

Mar 03, 2016 Modeling and numerical simulation of simultaneous heat and mass transfer during convective drying of porous materials Show all authors. Kamil Kahveci. ... V. Effects of microwave-assisted hot air drying and conventional hot air drying on the drying kinetics, color, rehydration, and volatiles of Moringa ... Int Commun Heat Mass Transfer 2015 ...

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Modeling of nonisothermal heat and moisture transfer in

Modeling of nonisothermal heat and moisture transfer in

Dec 01, 2004 Heat and mass transfer in two-phase porous materials under intensive microwave heating. ... Computational results for the intensive microwave heating of porous materials are presented in this work. A multi-phase porous media model has been developed to predict the heating mechanism. ... Drying of a porous medium with internal heat generation.

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Heat and mass transfer during microwaveconvective drying

Heat and mass transfer during microwaveconvective drying

Microwave drying involves complex physical mechanisms which should be taken into account in the complete mathematical model. Diffusion and convection, Maxwell-Stefan diffusion, Darcys flow and conduction and convection were considered in order to model the mass transfer of liquid-water, water-vapor, pressure buildup and heat transfer ...

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