Methods of Determination for Effective Diffusion Coefficient During Convective Drying of Clay Products

Vasić, Milica; Grbavčić, Željko; Radojević, Zagorka

doi:10.5772/48217

Cited by 3 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It could be concluded that, for any initial thickness of the sludge samples, any temperature and velocity of drying air, the suggested model including shrinking effect describes well the drying process. These results were in agreement with other studies carried out on drying of porous clay materials [33,49,50].…”

Section: Validation Of the Mathematical Model Of Convective Drying Of Pssupporting

confidence: 93%

Optimizing Convective Drying for Efficient Reduction of Phosphate Sludge Moisture: Experimental Investigations and Mathematical Modeling

Bellaziz,

Berroug,

Mandi

et al. 2023

Preprint

View full text Add to dashboard Cite

Phosphate extraction process produces large amounts of waste sludge, that is disposed of in the environment. Phosphate sludge (PS) is characterized by high moisture content (70–80%) which is a major handicap for any further disposal. To overcome this issue, the drying of this waste could be an appropriate solution to minimize its volume. The present work is focused on the convective drying behavior of PS and its mathematical modeling to optimize the drying processes. Drying experiments were conducted using thicknesses of 1, 2 and 4 cm. Drying air temperature and velocity ranged respectively in 50–70°C and 1–2 m/s. The findings showed that improving drying air temperature and velocity, and decreasing sample thickness enhance considerably the drying rate. Furthermore, the drying curves showed the presence of two main drying periods corresponding to constant drying rate and falling drying rate periods. Moreover, a model considering heat and mass transfer equations for each phase in wet sludge was used to fit the experimental results. Based on the analytical solutions and according to the statistical criteria R2 and RMSE ranged from 0.9957–0.9996 and 0.0157–0.0276, respectively, it was concluded that the model describes the drying behavior of washing PS in all tested convective drying conditions.

show abstract

Section: Validation Of the Mathematical Model Of Convective Drying Of Pssupporting

confidence: 93%

Optimizing Convective Drying for Efficient Reduction of Phosphate Sludge Moisture: Experimental Investigations and Mathematical Modeling

Bellaziz,

Berroug,

Mandi

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Determination of the effective diffusion coefficient is essential for a credible description of the mass transfer process, described by Fick's equation [2]. Description and modeling of drying process based on the calculation of constant effective moisture diffusivity have been the subject of many studies [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…This method is commonly known as "simplified slope" model. Two programs for determination of effective diffusion coefficient, based on mathematical calculation of Fick's second law and the Cranck diffusion equation, were recently presented for clay tiles [2,6,7].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling of Isothermal Drying and its Potential Application in the Design of the Industrial Drying Regimes of Clay Products

Vasić¹,

Radojević²,

Rekecki³

2016

Operations Research-the Art of Making Good Decisions

View full text Add to dashboard Cite

The processes of simultaneous moisture and heat transfer, which are often nonstationary, and the distinct nature and properties of the material to be dried complicate the description of the drying process. The theory of moisture migration and modeling of drying process has been the subject of many studies. Three theories, the difusion, the capillary low, and the evaporation-condensation, have won general recognition for the explanation of moisture transfer in porous media. This study has several objectives. The irst one was to present a new method for calculation of the variable efective difusivity as well as to identify diferent drying mechanisms and its exact transitions during isothermal drying of clay tiles. The second and main objectives were to analyze all obtained isothermal data, to create a link with the comprehensive theory of moisture migration during drying, and to set up the non-isothermal drying process. The procedure was based on the principle of controlling the mass transport during the drying process. Proposed regimes were consisted from several isothermal segments. Isothermal segments were selected and speciicated in accordance with the clay raw material nature and the moisture migration theory.

show abstract

Experimental investigation and modeling of conductive drying of washing phosphate sludge with and without shrinking effect

et al. 2022

View full text Add to dashboard Cite

Methods of Determination for Effective Diffusion Coefficient During Convective Drying of Clay Products

Cited by 3 publications

References 18 publications

Optimizing Convective Drying for Efficient Reduction of Phosphate Sludge Moisture: Experimental Investigations and Mathematical Modeling

Optimizing Convective Drying for Efficient Reduction of Phosphate Sludge Moisture: Experimental Investigations and Mathematical Modeling

Mathematical Modeling of Isothermal Drying and its Potential Application in the Design of the Industrial Drying Regimes of Clay Products

Experimental investigation and modeling of conductive drying of washing phosphate sludge with and without shrinking effect

Contact Info

Product

Resources

About