Modelling effective moisture diffusivity of pumpkin (Cucurbita moschata) slices under convective hot air drying condition
This study seeks to investigate the effects of temperature (50, 60, 70 and 80 °C) and material thickness (3, 5 and 7 mm), on the drying characteristics of pumpkin (Cucurbita moschata). Experimental data were used to estimate the effective moisture diffusivities and activation energy of pumpkin by us...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Walter de Gruyter GmbH
2016
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| Online Access: | http://psasir.upm.edu.my/id/eprint/53307/1/Modelling%20effective%20moisture%20diffusivity%20of%20pumpkin%20%28Cucurbita%20moschata%29%20slices%20under%20convective%20hot%20air%20drying%20condition.pdf |
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| author | Onwude, Daniel Iroemeha Hashim, Norhashila Janius, Rimfiel Mat Nawi, Nazmi Abdan, Khalina |
| author_facet | Onwude, Daniel Iroemeha Hashim, Norhashila Janius, Rimfiel Mat Nawi, Nazmi Abdan, Khalina |
| author_sort | Onwude, Daniel Iroemeha |
| collection | UPM |
| description | This study seeks to investigate the effects of temperature (50, 60, 70 and 80 °C) and material thickness (3, 5 and 7 mm), on the drying characteristics of pumpkin (Cucurbita moschata). Experimental data were used to estimate the effective moisture diffusivities and activation energy of pumpkin by using solutions of Fick’s second law of diffusion or its simplified form. The calculated value of moisture diffusivity with and without shrinkage effect varied from a minimum of 1.942 × 10–8 m2/s to a maximum of 9.196 × 10–8 m2/s, while that of activation energy varied from 5.02158 to 32.14542 kJ/mol with temperature ranging from 50 to 80 °C and slice thickness of 3 to 7 mm at constant air velocity of 1.16 m/s, respectively. The results indicated that with increasing temperature, and reduction of slice thickness, the drying time was reduced by more than 30 %. The effective moisture diffusivity increased with an increase in drying temperature with or without shrinkage effect. An increase in the activation energy was observed due to an increase in the slice thickness of the pumpkin samples. |
| first_indexed | 2024-03-06T09:17:30Z |
| format | Article |
| id | upm.eprints-53307 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:17:30Z |
| publishDate | 2016 |
| publisher | Walter de Gruyter GmbH |
| record_format | dspace |
| spelling | upm.eprints-533072022-03-18T04:34:24Z http://psasir.upm.edu.my/id/eprint/53307/ Modelling effective moisture diffusivity of pumpkin (Cucurbita moschata) slices under convective hot air drying condition Onwude, Daniel Iroemeha Hashim, Norhashila Janius, Rimfiel Mat Nawi, Nazmi Abdan, Khalina This study seeks to investigate the effects of temperature (50, 60, 70 and 80 °C) and material thickness (3, 5 and 7 mm), on the drying characteristics of pumpkin (Cucurbita moschata). Experimental data were used to estimate the effective moisture diffusivities and activation energy of pumpkin by using solutions of Fick’s second law of diffusion or its simplified form. The calculated value of moisture diffusivity with and without shrinkage effect varied from a minimum of 1.942 × 10–8 m2/s to a maximum of 9.196 × 10–8 m2/s, while that of activation energy varied from 5.02158 to 32.14542 kJ/mol with temperature ranging from 50 to 80 °C and slice thickness of 3 to 7 mm at constant air velocity of 1.16 m/s, respectively. The results indicated that with increasing temperature, and reduction of slice thickness, the drying time was reduced by more than 30 %. The effective moisture diffusivity increased with an increase in drying temperature with or without shrinkage effect. An increase in the activation energy was observed due to an increase in the slice thickness of the pumpkin samples. Walter de Gruyter GmbH 2016-07 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/53307/1/Modelling%20effective%20moisture%20diffusivity%20of%20pumpkin%20%28Cucurbita%20moschata%29%20slices%20under%20convective%20hot%20air%20drying%20condition.pdf Onwude, Daniel Iroemeha and Hashim, Norhashila and Janius, Rimfiel and Mat Nawi, Nazmi and Abdan, Khalina (2016) Modelling effective moisture diffusivity of pumpkin (Cucurbita moschata) slices under convective hot air drying condition. International Journal of Food Engineering, 12 (5). pp. 481-489. ISSN 2194-5764; ESSN: 1556-3758 https://www.degruyter.com/document/doi/10.1515/ijfe-2015-0382/html 10.1515/ijfe-2015-0382 |
| spellingShingle | Onwude, Daniel Iroemeha Hashim, Norhashila Janius, Rimfiel Mat Nawi, Nazmi Abdan, Khalina Modelling effective moisture diffusivity of pumpkin (Cucurbita moschata) slices under convective hot air drying condition |
| title | Modelling effective moisture diffusivity of pumpkin (Cucurbita moschata) slices under convective hot air drying condition |
| title_full | Modelling effective moisture diffusivity of pumpkin (Cucurbita moschata) slices under convective hot air drying condition |
| title_fullStr | Modelling effective moisture diffusivity of pumpkin (Cucurbita moschata) slices under convective hot air drying condition |
| title_full_unstemmed | Modelling effective moisture diffusivity of pumpkin (Cucurbita moschata) slices under convective hot air drying condition |
| title_short | Modelling effective moisture diffusivity of pumpkin (Cucurbita moschata) slices under convective hot air drying condition |
| title_sort | modelling effective moisture diffusivity of pumpkin cucurbita moschata slices under convective hot air drying condition |
| url | http://psasir.upm.edu.my/id/eprint/53307/1/Modelling%20effective%20moisture%20diffusivity%20of%20pumpkin%20%28Cucurbita%20moschata%29%20slices%20under%20convective%20hot%20air%20drying%20condition.pdf |
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