图书馆订阅: Guest
Begell Digital Portal Begell 数字图书馆 电子图书 期刊 参考文献及会议录 研究收集
多孔介质期刊
影响因子: 1.061 5年影响因子: 1.151 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v14.i7.30
pages 593-605

HEAT AND MASS DIFFUSION AND SHRINKAGE IN PROLATE SPHEROIDAL BODIES BASED ON NON-EQUILIBRIUM THERMODYNAMICS: A NUMERICAL INVESTIGATION

V. A. B. de Oliveira
Universidade Estadual da Paraíba (UEPB), Centro de Ciencias Exatas Sociais Aplicadas
W. C. P. B. de Lima
Departmento de Engenharia Química, Centro de Ciências e Tecnologia, Universidade Federal de Campina Grande (UFCG), Bodocongó
Severino Rodrigues de Farias Neto
Departamento de Engenharia Mecânica, Centro de Ciências e Tecnologia, Universidade Federal de Campina Grande (UFCG)
Antonio Gilson Barbosa de Lima
Departamento de Engenharia Mecânica, Centro de Ciências e Tecnologia, Universidade Federal de Campina Grande (UFCG)

ABSTRACT

The diffusion phenomenon exists in many industrial applications such as in the drying, wetting, heating, and cooling of solids, and principally in biological products such as in foodstuffs (grains, fruits, vegetables, etc.). In this sense, a new mathematical formulation to describe the simultaneous heat and mass (liquid and vapor) transfer and shrinkage during drying of capillary-porous bodies, with particular reference to prolate spheroid solids, is presented. The mathematical model was based on non-equilibrium thermodynamics considering variable transport coefficients and convective boundary conditions at the surface of the solid, including dimension variations. All of the governing equations presented in the model are written in prolate spheroidal coordinates and solved numerically by the finite-volume method using fully implicit formulation. An application of the methodology was used to predict drying of wheat kernel. Results on drying and heating kinetics, and on the moisture content and temperature distributions in a wheat kernel during the drying process, are presented and analyzed. The methodology also allows verification of heat, liquid, and vapor fluxes, taking into account the thermal and moisture gradients inside the grain.


Articles with similar content:

Mathematical Modeling of Process of Filtration Consolidation of Saturated with Binary Saline Solutions Porous Media under Conditions of Relaxation Filtration
Journal of Automation and Information Sciences, Vol.40, 2008, issue 1
Vladimir M. Bulavatskiy
Superheated Steam Drying of a Spherical Porous Particle
Journal of Porous Media, Vol.11, 2008, issue 7
Jalila Sghaier, Ali Belghith, Wahbi Jomaa
Mathematical Modeling of Filtration Consolidation with Considering the Presence of Concentration Gradient
Journal of Automation and Information Sciences, Vol.37, 2005, issue 5
Vladimir M. Bulavatskiy
NUMERICAL SIMULATION OF EVAPORATION AND DEFORMATION OF A SINGLE N-HEPTANE DROPLET UNDER FORCED CONVECTIVE CONDITION
Atomization and Sprays, Vol.28, 2018, issue 12
Chuang Sun, Zi-Cheng Jin, Feng-Xian Sun, Zheng-Yu Wang
Double Diffusive Natural Convection in a Cylinder Filled with Moist Porous Grains and Exposed to a Constant Wall Heat Flux
Journal of Porous Media, Vol.6, 2003, issue 2
Leila Zili-Ghedira, Sassi Ben Nasrallah, Khalifa Slimi