Study on Intermittent Microwave Convective Drying Characteristics and Flow Field of Porous Media Food

Yu Man, Junjie Tong (), Tingyu Wang (), Shuxiang Wang and Hu Xu
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Yu Man: School of Materials and Energy, Guangdong University of Technology, Guangzhou 511400, China
Junjie Tong: School of Naval Architecture and Ocean Engineering, Guangzhou Maritime University, Guangzhou 510700, China
Tingyu Wang: School of Naval Architecture and Ocean Engineering, Guangzhou Maritime University, Guangzhou 510700, China
Shuxiang Wang: School of Naval Architecture and Ocean Engineering, Guangzhou Maritime University, Guangzhou 510700, China
Hu Xu: School of Naval Architecture and Ocean Engineering, Guangzhou Maritime University, Guangzhou 510700, China

Energies, 2022, vol. 16, issue 1, 1-16

Abstract: Numerical simulations were carried out for moist, porous media, intermittent microwave convective drying (IMCD) using a multiphase flow model in porous media subdomains coupled with a forced-convection heat-transfer model in an external hot air subdomain. The models were solved by using COMSOL Multiphysics was applied at the pulse ratio (PR) of 3. Based on drying characteristics of porous media and the distribution of the evaporation interface, IMCD was compared with convection drying (CD). Drying uniformity K , velocity difference, temperature difference, and humidity difference were introduced to evaluate the performance of three models with different inlets and outlet wall curvature. The numerical results show that as the moisture content of slices was reduced to 3 kg/kg, the drying rate in IMCD was 0.0166–0.02 m/s higher than that in CD, and the total drying time of the former was 81.35% shorter than that of the latter. In the late drying stage of IMCD, the core of the sample still had a high vapor concentration and temperature, which led to the evaporation interface remaining on the surface. The vapor evaporated from the slices can diffuse rapidly to the outside, which is why IMCD is superior to traditional convection drying. Through the comprehensive analysis of the models with different inlet and outlet wall curvatures, the drying uniformity K of the type III was the highest, reaching 89.28%. Optimizing flow-field distribution can improve uniform of airflow distribution.

Keywords: intermittent microwave convective drying; evaporation interface; porous media; multiphase flow; flow-field distribution (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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