Convective and Microwave Assisted Drying of Wet Porous Materials with Prolate Spheroidal Shape: A Finite-Volume Approach

Agriculture

ÍtaloA. Gomes¹  JoãoP. L. Ferreira²  RossanaM. F. Figueirêdo²  AlexandreJ. M. Queiroz²  JosivandaP. Gomes²  AntonioD. B. Macedo²  ÂngelaM. Santiago³  AntonioG. B. Lima⁴  RicardoS. Gomez⁴  WiltonP. Silva⁵  EdnaG. Silva⁶ 

[1] Center of Exact and Applied Social Sciences, State University of Paraiba, Patos 58706-550, Brazil;Department of Agricultural Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil;Department of Chemical, State University of Paraiba, Campina Grande 58429-500, Brazil;Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil;Department of Physics, Federal University of Campina Grande, Campina Grande 58429-900, Brazil;Department of Physics, State University of Paraiba, Campina Grande 58429-500, Brazil;

关键词: drying;    microwave;    convective;    prolate spheroid;    simulation;   

DOI  :  10.3390/agriculture10110507

来源: DOAJ

【 摘 要 】

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 prolate spheroidal shape. An advanced mathematical modeling based on the diffusion theory (mass and energy conservation equations) written in prolate spheroidal coordinates was derived and the numerical solution using the finite-volume method is presented. Here, we evaluated the effect of the heat and mass transport coefficients and microwave power intensity on the moisture removal and heating of the solid. Results of the drying and heating kinetics and the moisture and temperature distribution inside the solid are presented and discussed. It was verified that the higher the convective heat and mass transfer coefficients and microwave power intensity, the faster the solid will dry and heat up.

【 授权许可】

Unknown