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| Optimization of moisture content uniformity in the drying process of oil-tea camellia seed plate dryer based on Pielou index |
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| DOI： |
| KeyWord:oil-tea camellia seed plate dryer heat moisture coupling UDF numerical simulation Pielou index moisture content uniformity |
| FundProject: |
| Author Name | Affiliation | | XU Shunsheng1,2,SHEN Chong1,YU Donggang1,WANG Jing1 | 1.School of Mechanical Engineering, Xiangtan University, Xiangtan 411105,Hunan,China
2.School of Energy Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: |
| To improve the problems of low drying efficiency and uneven drying of oil-tea camellia seed plate dryer, based on the computational fluid dynamics, a heat moisture coupling model in porous media was established, UDF program was written and the reliability of the model was verified by FLUENT software simulation and experiments. The traditional moisture content evenness index Muwas introduced and compared with the moisture content evenness index Jsw proposed on the basis of Pielou index. Through simulation calculation, the effects of dryer structures, air inlet angles and operating parameters on the moisture content of oil-tea camellia seeds and its uniformity after drying were studied. The results showed that both Mu and Jsw could be used as evaluation indexes of moisture content uniformity of materials such as wet porous media. The average moisture content of the dryer with air inlet in the middle and air outlet on both sides of the air duct was lower than that of the dryer with the original structure, and the uniformity of moisture content was greatly improved. When the air inlet angle was deflected downward by 30°, the hot air speed was 5 m/s, the hot air temperature was 80℃ and the heating plate temperature was 85℃, the moisture content of oil-tea camellia seeds was reduced from 7.94% to 4.76% compared with the original structure dryer, and Jsw increased from 25.5% to 83.2%.Through the optimization of moisture content uniformity in the drying process of oil-tea camellia seed plate dryer based on Pielou index, the drying efficiency and uniformity are significantly improved. |
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