This page has only limited features, please log in for full access.

Unclaimed
Ivonete Santos
Department of Physics, State University of Paraiba, Campina Grande, PB 58429-500, Brazil

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 16 July 2021 in Energies
Reads 0
Downloads 0

This work aims to study the drying of clay ceramic materials with arbitrary shapes theoretically. Advanced phenomenological mathematical models based on lumped analysis and their exact solutions are presented to predict the heat and mass transfers in the porous material and estimate the transport coefficients. Application has been made in hollow ceramic bricks. Different simulations were carried out to evaluate the effect of drying air conditions (relative humidity and speed) under conditions of forced and natural convection. The transient results of the moisture content and temperature of the brick, and the convective heat and mass transfer coefficients are presented, discussed and compared with experimental data, obtaining a good agreement. It was found that the lower the relative humidity is and the higher the speed of the drying air is, the higher the convective heat and mass transfer coefficients are at the surface of the brick and in the holes, and the faster the moisture removal material and heating is. Based on the predicted results, the best conditions for brick drying were given. The idea is to increase the quality of the brick after the process, to reduce the waste of raw material and energy consumption in the process.

ACS Style

Elisiane Lima; João Delgado; Ana Guimarães; Wanderson Lima; Ivonete Santos; Josivanda Gomes; Rosilda Santos; Anderson Vilela; Arianne Viana; Genival Almeida; Antonio Lima; João Franco. Drying and Heating Processes in Arbitrarily Shaped Clay Materials Using Lumped Phenomenological Modeling. Energies 2021, 14, 4294 .

AMA Style

Elisiane Lima, João Delgado, Ana Guimarães, Wanderson Lima, Ivonete Santos, Josivanda Gomes, Rosilda Santos, Anderson Vilela, Arianne Viana, Genival Almeida, Antonio Lima, João Franco. Drying and Heating Processes in Arbitrarily Shaped Clay Materials Using Lumped Phenomenological Modeling. Energies. 2021; 14 (14):4294.

Chicago/Turabian Style

Elisiane Lima; João Delgado; Ana Guimarães; Wanderson Lima; Ivonete Santos; Josivanda Gomes; Rosilda Santos; Anderson Vilela; Arianne Viana; Genival Almeida; Antonio Lima; João Franco. 2021. "Drying and Heating Processes in Arbitrarily Shaped Clay Materials Using Lumped Phenomenological Modeling." Energies 14, no. 14: 4294.

Journal article
Published: 09 June 2021 in Energies
Reads 0
Downloads 0

Commonly based on the liquid diffusion theory, drying theoretical studies in porous materials has been directed to plate, cylinder, and sphere, and few works are applied to non-conventional geometries. In this sense, this work aims to study, theoretically, the drying of solids with oblate spheroidal geometry based on the thermodynamics of irreversible processes. Mathematical modeling is proposed to describe, simultaneously, the heat and mass transfer (liquid and vapor) during the drying process, considering the variability of the transport coefficients and the convective boundary conditions on the solid surface, with particular reference to convective drying of lentil grains at low temperature and moderate air relative humidity. All the governing equations were written in the oblate spheroidal coordinates system and solved numerically using the finite-volume technique and the iterative Gauss–Seidel method. Numerical results of moisture content, temperature, liquid, vapor, and heat fluxes during the drying process were obtained, analyzed, and compared with experimental data, with a suitable agreement. It was observed that the areas near the focal point of the lentil grain dry and heat up faster; consequently, these areas are more susceptible to the appearance of cracks that can compromise the quality of the product. In addition, it was found that the vapor flux was predominant during the drying process when compared to the liquid flux.

ACS Style

João Melo; João Delgado; Wilton Silva; Antonio B. Lima; Ricardo Gomez; Josivanda Gomes; Rossana Figueirêdo; Alexandre Queiroz; Ivonete Santos; Maria Machado; Wanderson Lima; João Carmo. Non-Equilibrium Thermodynamics-Based Convective Drying Model Applied to Oblate Spheroidal Porous Bodies: A Finite-Volume Analysis. Energies 2021, 14, 3405 .

AMA Style

João Melo, João Delgado, Wilton Silva, Antonio B. Lima, Ricardo Gomez, Josivanda Gomes, Rossana Figueirêdo, Alexandre Queiroz, Ivonete Santos, Maria Machado, Wanderson Lima, João Carmo. Non-Equilibrium Thermodynamics-Based Convective Drying Model Applied to Oblate Spheroidal Porous Bodies: A Finite-Volume Analysis. Energies. 2021; 14 (12):3405.

Chicago/Turabian Style

João Melo; João Delgado; Wilton Silva; Antonio B. Lima; Ricardo Gomez; Josivanda Gomes; Rossana Figueirêdo; Alexandre Queiroz; Ivonete Santos; Maria Machado; Wanderson Lima; João Carmo. 2021. "Non-Equilibrium Thermodynamics-Based Convective Drying Model Applied to Oblate Spheroidal Porous Bodies: A Finite-Volume Analysis." Energies 14, no. 12: 3405.

Journal article
Published: 27 April 2021 in Energies
Reads 0
Downloads 0

Vegetable fibers have inspired studies in academia and industry, because of their good characteristics appropriated for many technological applications. Sisal fibers (Agave sisalana variety), when extracted from the leaf, are wet and must be dried to reduce moisture content, minimizing deterioration and degradation for long time. The control of the drying process plays an important role to guarantee maximum quality of the fibers related to mechanical strength and color. In this sense, this research aims to evaluate the drying of sisal fibers in an oven with mechanical air circulation. For this purpose, a transient and 3D mathematical model has been developed to predict moisture removal and heating of a fiber porous bed, and drying experiments were carried out at different drying conditions. The advanced model considers bed porosity, fiber and bed moisture, simultaneous heat and mass transfer, and heat transport due to conduction, convection and evaporation. Simulated drying and heating curves and the hygroscopic equilibrium moisture content of the sisal fibers are presented and compared with the experimental data, and good concordance was obtained. Results of moisture content and temperature distribution within the fiber porous bed are presented and discussed in details. It was observed that the moisture removal and temperature kinetics of the sisal fibers were affected by the temperature and relative humidity of the drying air, being more accentuated at higher temperature and lower relative humidity, and the drying process occurred in a falling rate period.

ACS Style

Jacqueline Diniz; João Delgado; Anderson Vilela; Ricardo Gomez; Arianne Viana; Maria Figueiredo; Diego Diniz; Isis Rodrigues; Fagno Rolim; Ivonete Santos; João Carmo; Antonio Lima. Drying of Sisal Fiber: A Numerical Analysis by Finite-Volumes. Energies 2021, 14, 2514 .

AMA Style

Jacqueline Diniz, João Delgado, Anderson Vilela, Ricardo Gomez, Arianne Viana, Maria Figueiredo, Diego Diniz, Isis Rodrigues, Fagno Rolim, Ivonete Santos, João Carmo, Antonio Lima. Drying of Sisal Fiber: A Numerical Analysis by Finite-Volumes. Energies. 2021; 14 (9):2514.

Chicago/Turabian Style

Jacqueline Diniz; João Delgado; Anderson Vilela; Ricardo Gomez; Arianne Viana; Maria Figueiredo; Diego Diniz; Isis Rodrigues; Fagno Rolim; Ivonete Santos; João Carmo; Antonio Lima. 2021. "Drying of Sisal Fiber: A Numerical Analysis by Finite-Volumes." Energies 14, no. 9: 2514.

Journal article
Published: 24 December 2020 in Agriculture
Reads 0
Downloads 0

This work aims to experimentally study the drying of agricultural products using microwaves, with particular reference to grains. Microwave drying experiments were carried out with paddy rice grains in natura (BRSMG Conai variety) for three levels of incident microwave power per mass of fresh grain (6.27, 14.63 and 22.99 W/g). Results of grain drying and heating kinetics are presented and analyzed. It was verified that the ideal average moisture content for grain storage and marketing, 15% (d.b.), occurred at 20 min (6.27 W/g), 13 min (14.63 W/g) and 7 min (22.99 W/g), and that the equilibrium moisture content of the samples reached 4.4%, 2.7% and 1.9%, at 310, 180 and 110 min, for each of the three power levels studied, respectively. The drying with the highest absorbed power caused discoloration of the grains at the end of the drying process.

ACS Style

Edna Silva; Ricardo Gomez; Josivanda Gomes; Wilton Silva; Ketinlly Porto; Fagno Rolim; João Carmo; Romário Andrade; Ivonete Santos; Rodrigo Sousa; Diego Diniz; Marcella Aragão; Antonio Lima. Heat and Mass Transfer on the Microwave Drying of Rough Rice Grains: An Experimental Analysis. Agriculture 2020, 11, 8 .

AMA Style

Edna Silva, Ricardo Gomez, Josivanda Gomes, Wilton Silva, Ketinlly Porto, Fagno Rolim, João Carmo, Romário Andrade, Ivonete Santos, Rodrigo Sousa, Diego Diniz, Marcella Aragão, Antonio Lima. Heat and Mass Transfer on the Microwave Drying of Rough Rice Grains: An Experimental Analysis. Agriculture. 2020; 11 (1):8.

Chicago/Turabian Style

Edna Silva; Ricardo Gomez; Josivanda Gomes; Wilton Silva; Ketinlly Porto; Fagno Rolim; João Carmo; Romário Andrade; Ivonete Santos; Rodrigo Sousa; Diego Diniz; Marcella Aragão; Antonio Lima. 2020. "Heat and Mass Transfer on the Microwave Drying of Rough Rice Grains: An Experimental Analysis." Agriculture 11, no. 1: 8.

Journal article
Published: 23 September 2020 in Agriculture
Reads 0
Downloads 0

Bananas are some of the most consumed fruits throughout the world, providing metabolizable calories and vitamins for humans, along with many other benefits. However, this fruit tends to be easily degraded by microorganisms and other chemical agents because of the high moisture content. Considering the importance, this work focuses on an experimental study regarding banana fruit drying. For such purpose, whole bananas were hand-peeled and sliced longitudinally and then dried by a hot air circulation oven with air temperatures of 40 °C, 50 °C, 60 °C and 70 °C. Measurements of mass, temperature, and dimensions of the sample were done during the drying process. Results of drying, heating, and shrinkage (volume and surface area) kinetics are presented and analyzed. The study revealed that the drying air temperature significantly affected moisture removal, heating, and dimensions’ variation rates, as well as quality of banana fruit. The drying carried out with higher temperature and lower relative humidity of the air gave rise to higher rates of drying, heating and variation of dimensions, and shorter drying time of the product.

ACS Style

Raimundo Farias; Ricardo Gomez; Wilton Silva; Leonardo Silva; Guilherme Oliveira Neto; Ivonete Santos; João Carmo; José Nascimento; Antonio Lima. Heat and Mass Transfer, and Volume Variations in Banana Slices during Convective Hot Air Drying: An Experimental Analysis. Agriculture 2020, 10, 423 .

AMA Style

Raimundo Farias, Ricardo Gomez, Wilton Silva, Leonardo Silva, Guilherme Oliveira Neto, Ivonete Santos, João Carmo, José Nascimento, Antonio Lima. Heat and Mass Transfer, and Volume Variations in Banana Slices during Convective Hot Air Drying: An Experimental Analysis. Agriculture. 2020; 10 (10):423.

Chicago/Turabian Style

Raimundo Farias; Ricardo Gomez; Wilton Silva; Leonardo Silva; Guilherme Oliveira Neto; Ivonete Santos; João Carmo; José Nascimento; Antonio Lima. 2020. "Heat and Mass Transfer, and Volume Variations in Banana Slices during Convective Hot Air Drying: An Experimental Analysis." Agriculture 10, no. 10: 423.

Book chapter
Published: 12 July 2015 in Advanced Structured Materials
Reads 0
Downloads 0

This chapter briefly focuses on the drying of wet bioproducts with particular reference to fruits, vegetables and grains. Different related topics in terms of drying foundations, dryer selection, product quality, energy savings, energy sources, energy efficiency, energy recovery, operating safety, environmental impact, and advanced drying techniques are presented and discussed. The study confirm drying as a highly energy-consuming process, one of the major source of pollutant emissions, and one dehydration technique that strongly affect product quality under different aspects such as color, flavor, appearance, aroma, losses of nutrients and vitamins, and many others physical, chemical, structural, and nutritional quality parameters.

ACS Style

A. G. Barbosa De Lima; J. V. Da Silva; E. M. A. Pereira; I. B. Dos Santos; W. M. P. Barbosa De Lima. Drying of Bioproducts: Quality and Energy Aspects. Advanced Structured Materials 2015, 1 -18.

AMA Style

A. G. Barbosa De Lima, J. V. Da Silva, E. M. A. Pereira, I. B. Dos Santos, W. M. P. Barbosa De Lima. Drying of Bioproducts: Quality and Energy Aspects. Advanced Structured Materials. 2015; ():1-18.

Chicago/Turabian Style

A. G. Barbosa De Lima; J. V. Da Silva; E. M. A. Pereira; I. B. Dos Santos; W. M. P. Barbosa De Lima. 2015. "Drying of Bioproducts: Quality and Energy Aspects." Advanced Structured Materials , no. : 1-18.

Book chapter
Published: 21 June 2014 in Advanced Structured Materials
Reads 0
Downloads 0

This chapter briefly focuses on the theory and applications of drying process (heat and mass transfer) with particular reference to arbitrarily-shaped wet capillary-porous bodies. Here, a modeling based on the liquid diffusion theory and the mathematical formalism to obtain the exact solution of the governing equation via Galerkin-based integral method are presented. The model considers constant thermo-physical properties and convective boundary conditions at the surface of the solid. Applications have been done to different solids of revolution and wheat grain. Predicted results of the average moisture content, average temperature, and moisture content and temperature distributions within the porous solids are presented and discussed, and for particular situations they are compared with experimental drying data.

ACS Style

A. G. Barbosa De Lima; J. M. P. Q. Delgado; I. B. Santos; J. P. Silva Santos; E. S. Barbosa; C. Joaquina E Silva. GBI Method: A Powerful Technique to Study Drying of Complex Shape Solids. Advanced Structured Materials 2014, 25 -43.

AMA Style

A. G. Barbosa De Lima, J. M. P. Q. Delgado, I. B. Santos, J. P. Silva Santos, E. S. Barbosa, C. Joaquina E Silva. GBI Method: A Powerful Technique to Study Drying of Complex Shape Solids. Advanced Structured Materials. 2014; ():25-43.

Chicago/Turabian Style

A. G. Barbosa De Lima; J. M. P. Q. Delgado; I. B. Santos; J. P. Silva Santos; E. S. Barbosa; C. Joaquina E Silva. 2014. "GBI Method: A Powerful Technique to Study Drying of Complex Shape Solids." Advanced Structured Materials , no. : 25-43.