Experimental studies of mass transfer in caryopsis at grain oscillating drying
At a continual heatsupply at the beginning of drying process intensity of a mass transfer from a caryopsis surface exceeds intensity of moisture supply from its center to a surface. Thus the moisture content gradient in the caryopsis increases more than a difference between equilibrium moisture cont...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Russian |
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Federal Scientific Agroengineering Centre VIM
2016-08-01
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| Series: | Сельскохозяйственные машины и технологии |
| Subjects: | |
| Online Access: | https://www.vimsmit.com/jour/article/view/143 |
| _version_ | 1797872212187807744 |
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| author | S. A. Pavlov I. A. Pekhal’Skiy R. A. Marin |
| author_facet | S. A. Pavlov I. A. Pekhal’Skiy R. A. Marin |
| author_sort | S. A. Pavlov |
| collection | DOAJ |
| description | At a continual heatsupply at the beginning of drying process intensity of a mass transfer from a caryopsis surface exceeds intensity of moisture supply from its center to a surface. Thus the moisture content gradient in the caryopsis increases more than a difference between equilibrium moisture content and surface one. In the course of drying intensity of a mass tranfer decreases because of predrying of surface layers, the gradient of moisture content decreases, the front of evaporation continuously goes deep, respectively, intensity of process decreases. The variable heatsupply when seeds and grains drying allows to intensify process at full preservation of their quality indicators. The aythors proved parameters of oscillating drying and studied a mass transfer in a caryopsis for three drying modes: without lying, with lying after the heating period and lying after the cooling period. They compared efficiency of the oscillating drying modes to the drying mode at a continual heatsupply. The mass transfer was studied in the course of drying, humidity of a caryopsis and its cover and kernel was defined. Regularities of a mass transfer are revealed, the optimum modes of oscillating drying are offered: (the proportion of the periods «heating - cooling» is equal 10:10 minutes, an 15 minutes lying after the period «heating»). Physical and mathematical models are offered. The equation for calculation of lying duration is received. It is recommended to use the oscillating mode of drying with lying which duration should be sufficient for moisture redistribution in the caryopsis that keeps quality of seeds and grain. The lying extends process of drying (by 5 percent for an lying warmed up grain and by 10 percent for not warmed up one) in comparison with the same mode without lying, but allows to lower specific costs of warmth by 20-25 percent. At the oscillating mode lying duration is expedient when moisture removal increases in direct ratio to time. |
| first_indexed | 2024-04-10T00:56:20Z |
| format | Article |
| id | doaj.art-76f9cac5b7b2406b9736a6acf561ab0c |
| institution | Directory Open Access Journal |
| issn | 2073-7599 |
| language | Russian |
| last_indexed | 2024-04-10T00:56:20Z |
| publishDate | 2016-08-01 |
| publisher | Federal Scientific Agroengineering Centre VIM |
| record_format | Article |
| series | Сельскохозяйственные машины и технологии |
| spelling | doaj.art-76f9cac5b7b2406b9736a6acf561ab0c2023-03-13T10:16:45ZrusFederal Scientific Agroengineering Centre VIMСельскохозяйственные машины и технологии2073-75992016-08-01043237142Experimental studies of mass transfer in caryopsis at grain oscillating dryingS. A. Pavlov0I. A. Pekhal’Skiy1R. A. Marin2Всероссийский научно-исследовательский институт механизации сельского хозяйстваВсероссийский научно-исследовательский институт механизации сельского хозяйстваВсероссийский научно-исследовательский институт механизации сельского хозяйстваAt a continual heatsupply at the beginning of drying process intensity of a mass transfer from a caryopsis surface exceeds intensity of moisture supply from its center to a surface. Thus the moisture content gradient in the caryopsis increases more than a difference between equilibrium moisture content and surface one. In the course of drying intensity of a mass tranfer decreases because of predrying of surface layers, the gradient of moisture content decreases, the front of evaporation continuously goes deep, respectively, intensity of process decreases. The variable heatsupply when seeds and grains drying allows to intensify process at full preservation of their quality indicators. The aythors proved parameters of oscillating drying and studied a mass transfer in a caryopsis for three drying modes: without lying, with lying after the heating period and lying after the cooling period. They compared efficiency of the oscillating drying modes to the drying mode at a continual heatsupply. The mass transfer was studied in the course of drying, humidity of a caryopsis and its cover and kernel was defined. Regularities of a mass transfer are revealed, the optimum modes of oscillating drying are offered: (the proportion of the periods «heating - cooling» is equal 10:10 minutes, an 15 minutes lying after the period «heating»). Physical and mathematical models are offered. The equation for calculation of lying duration is received. It is recommended to use the oscillating mode of drying with lying which duration should be sufficient for moisture redistribution in the caryopsis that keeps quality of seeds and grain. The lying extends process of drying (by 5 percent for an lying warmed up grain and by 10 percent for not warmed up one) in comparison with the same mode without lying, but allows to lower specific costs of warmth by 20-25 percent. At the oscillating mode lying duration is expedient when moisture removal increases in direct ratio to time.https://www.vimsmit.com/jour/article/view/143сушка зернамассоперенососциллирующие режимы сушкиgrain dryingmass transferoscillating modes of drying |
| spellingShingle | S. A. Pavlov I. A. Pekhal’Skiy R. A. Marin Experimental studies of mass transfer in caryopsis at grain oscillating drying Сельскохозяйственные машины и технологии сушка зерна массоперенос осциллирующие режимы сушки grain drying mass transfer oscillating modes of drying |
| title | Experimental studies of mass transfer in caryopsis at grain oscillating drying |
| title_full | Experimental studies of mass transfer in caryopsis at grain oscillating drying |
| title_fullStr | Experimental studies of mass transfer in caryopsis at grain oscillating drying |
| title_full_unstemmed | Experimental studies of mass transfer in caryopsis at grain oscillating drying |
| title_short | Experimental studies of mass transfer in caryopsis at grain oscillating drying |
| title_sort | experimental studies of mass transfer in caryopsis at grain oscillating drying |
| topic | сушка зерна массоперенос осциллирующие режимы сушки grain drying mass transfer oscillating modes of drying |
| url | https://www.vimsmit.com/jour/article/view/143 |
| work_keys_str_mv | AT sapavlov experimentalstudiesofmasstransferincaryopsisatgrainoscillatingdrying AT iapekhalskiy experimentalstudiesofmasstransferincaryopsisatgrainoscillatingdrying AT ramarin experimentalstudiesofmasstransferincaryopsisatgrainoscillatingdrying |