A Framework and Numerical Solution of the Drying Process in Porous Media by Using a Continuous Model

Vu, Hong Thai; Tsotsas, Evangelos

doi:10.1155/2019/9043670

Cited by 10 publications

(12 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For a mixture of air and steam, Dalton's law states that the total pressure of the gas phase is equal to the sum of the partial pressures of steam and air. At the same time, under capillary pressure, the transfer of water out of the pores is hindered, and the pressure of free water in the pores can be expressed as (Vu and Tsotsas, 2019):…”

Section: Mass Conservation Equationmentioning

confidence: 99%

See 1 more Smart Citation

Heat and mass transfer law during microwave vacuum drying of rice

Sun

Zhang

Huang

2023

Qual. Assur. Saf. Crops Foods

View full text Add to dashboard Cite

In order to obtain the microwave vacuum drying characteristics of rice and the change in law of temperature and humidity, the mechanism of water diffusion and migration in the drying process was analyzed based on the multiphase flow in porous media, the change model of moisture content was established, and the microwave heating process coupled with electromagnetic field and mass heat field was simulated. The accuracy of the multiphase porous medium model was verified by measuring the moisture changes during rice drying under different vacuum degrees. The results show that the temperature distribution of rice during heating is high in the center and low around, and the vacuum degree hardly affects the change in rice temperature. The capillary pressure in rice gradually increases, and the equilibrium vapor pressure gradually decreases during drying. The estimated moisture content reduced from 0.25 to 0.189, 0.177, and 0.169, and the experimental value decreased from 0.25 to 0.186, 0.177, and 0.167 after drying the rice for 60 min at vacuum of 0.02 MPa, 0.04 MPa, and 0.06 MPa, respectively. The experimental value was in agreement with the calculated value. The higher the vacuum degree, the faster the drying speed, and this finding provided a new idea for improving the drying efficiency.

show abstract

Section: Mass Conservation Equationmentioning

confidence: 99%

“…In the drying process, the surface of the rice mainly takes away heat by convection heat transfer, so the boundary heat loss can be expressed as (Vu and Tsotsas, 2019):…”

Section: Energy Conservation Equationmentioning

confidence: 99%

Heat and mass transfer law during microwave vacuum drying of rice

Sun

Zhang

Huang

2023

Qual. Assur. Saf. Crops Foods

View full text Add to dashboard Cite

show abstract

“…Afterward, the macroscopic differential equations were defined in terms of average field quantities. The detail descriptions of Whitaker's model can be found in Vu et al [20,21]. In this section, the mass and energy conservation equations are briefly recalled.…”

Section: Whitaker's Continuum Modelmentioning

confidence: 99%

“…The superficial velocity of the liquid and gas phased v l and v g (m/s) are calculated as v l ¼À KK r,l μ l ∇p l and v g ¼À KK r,g μ g ∇p g (20) where K (m 2 ) is the absolute permeability of the porous medium. K r,l and K r,v are the relative permeabilities of the liquid and gas phases, which are respectively [21,22]. In Eq.…”

Section: Mass Conservation Equation Of Liquid Watermentioning

confidence: 99%

Multiscale Modeling of Non-Isothermal Fluid Transport Involved in Drying Process of Porous Media

Le¹

2021

Porous Fluids - Advances in Fluid Flow and Transport Phenomena in Porous Media

View full text Add to dashboard Cite

To preserve the product quality as well as to reduce the logistics and storage cost, drying process is widely applied in the processing of porous material. In consideration of transport phenomena that involve a porous medium during drying, the complex morphology of the medium, and its influences on the distribution, flow, displacement of multiphase fluids are encountered. In this chapter, the recent advanced mass and energy transport models of drying processes are summarized. These models which were developed based on both pore- and continuum-scales, may provide a better fundamental understanding of non-isothermal liquid–vapor transport at both the continuum scale and the pore scale, and to pave the way for designing, operating, and optimizing drying and relevant industrial processes.

show abstract

“…Often, those are determined experimentally for a support, yet research into analytical derivations of those parameters from routinely measured bulk properties is quite active. − Those models often rely on dedicated configurations of the pore size distributions and therefore allow the derivation of the relevant parameters from the porosity and the knowledge of minimum and maximum pore size. One interesting exception to this approach is given by the derivation of the averaged properties from an available pore size distribution, which offers a variety of potential insights in the impact of local pore morphology onto the drying process …”

Section: Introductionmentioning

confidence: 99%

Modeling the Drying Process of Porous Catalysts: Impact of the Pore Size Distribution

Rieder,

Peters,

Kuipers

2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The distribution of catalytically active species in heterogeneous porous catalysts strongly influences their performance and durability in industrial reactors. A drying model for investigating this redistribution was developed and implemented using the finite volume method. This model embeds an analytical approach regarding the permeability and capillary pressure from arbitrary pore size distributions. Subsequently, a set of varying pore size distributions are investigated, and their impact on the species redistribution during drying is quantified. It was found that small amounts of large pores speed up the drying process and reduce internal pressure build up significantly while having a negligible impact on the final distribution of the catalytically active species. By further increasing the amount of large pores, the accumulation of species at the drying surface is facilitated.

show abstract

A Framework and Numerical Solution of the Drying Process in Porous Media by Using a Continuous Model

Cited by 10 publications

References 32 publications

Heat and mass transfer law during microwave vacuum drying of rice

Heat and mass transfer law during microwave vacuum drying of rice

Multiscale Modeling of Non-Isothermal Fluid Transport Involved in Drying Process of Porous Media

Modeling the Drying Process of Porous Catalysts: Impact of the Pore Size Distribution

Contact Info

Product

Resources

About