A Non-Isothermal Moving-Boundary Model for Continuous and Intermittent Drying of Pears
A non-isothermal moving-boundary model for food dehydration, accounting for shrinkage and thermal effects, is proposed and applied to the analysis of intermittent dehydration in which air temperature, relative humidity, and velocity vary cyclically in time. The convection-diffusion heat transport eq...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Foods |
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| Online Access: | https://www.mdpi.com/2304-8158/9/11/1577 |
| _version_ | 1797549272373133312 |
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| author | Alessandra Adrover Claudia Venditti Antonio Brasiello |
| author_facet | Alessandra Adrover Claudia Venditti Antonio Brasiello |
| author_sort | Alessandra Adrover |
| collection | DOAJ |
| description | A non-isothermal moving-boundary model for food dehydration, accounting for shrinkage and thermal effects, is proposed and applied to the analysis of intermittent dehydration in which air temperature, relative humidity, and velocity vary cyclically in time. The convection-diffusion heat transport equation, accounting for heat transfer, water evaporation, and shrinkage at the sample surface, is coupled to the convection-diffusion water transport equation. Volume shrinkage is not superimposed but predicted by the model through the introduction of a point-wise shrinkage velocity. Experimental dehydration curves, in continuous and intermittent conditions, are accurately predicted by the model with an effective water diffusivity <inline-formula><math display="inline"><semantics><mrow><msub><mi>D</mi><mi>eff</mi></msub><mrow><mo>(</mo><mi>T</mi><mo>)</mo></mrow></mrow></semantics></math></inline-formula> that depends exclusively on the local temperature. The non-isothermal model is successfully applied to the large set of experimental data of continuous and intermittent drying of <i>Rocha</i> pears. |
| first_indexed | 2024-03-10T15:12:19Z |
| format | Article |
| id | doaj.art-c7e1fe2bf67a4630828f2c3c86f218d9 |
| institution | Directory Open Access Journal |
| issn | 2304-8158 |
| language | English |
| last_indexed | 2024-03-10T15:12:19Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Foods |
| spelling | doaj.art-c7e1fe2bf67a4630828f2c3c86f218d92023-11-20T19:15:45ZengMDPI AGFoods2304-81582020-10-01911157710.3390/foods9111577A Non-Isothermal Moving-Boundary Model for Continuous and Intermittent Drying of PearsAlessandra Adrover0Claudia Venditti1Antonio Brasiello2Dipartimento di Ingegneria Chimica, Materiali e Ambiente, Sapienza Università di Roma, via Eudossiana 18, 00184 Roma, ItalyDipartimento di Ingegneria Chimica, Materiali e Ambiente, Sapienza Università di Roma, via Eudossiana 18, 00184 Roma, ItalyDipartimento di Ingegneria Chimica, Materiali e Ambiente, Sapienza Università di Roma, via Eudossiana 18, 00184 Roma, ItalyA non-isothermal moving-boundary model for food dehydration, accounting for shrinkage and thermal effects, is proposed and applied to the analysis of intermittent dehydration in which air temperature, relative humidity, and velocity vary cyclically in time. The convection-diffusion heat transport equation, accounting for heat transfer, water evaporation, and shrinkage at the sample surface, is coupled to the convection-diffusion water transport equation. Volume shrinkage is not superimposed but predicted by the model through the introduction of a point-wise shrinkage velocity. Experimental dehydration curves, in continuous and intermittent conditions, are accurately predicted by the model with an effective water diffusivity <inline-formula><math display="inline"><semantics><mrow><msub><mi>D</mi><mi>eff</mi></msub><mrow><mo>(</mo><mi>T</mi><mo>)</mo></mrow></mrow></semantics></math></inline-formula> that depends exclusively on the local temperature. The non-isothermal model is successfully applied to the large set of experimental data of continuous and intermittent drying of <i>Rocha</i> pears.https://www.mdpi.com/2304-8158/9/11/1577intermittent dehydrationshrinkagemoving-boundary modelnon-isothermal drying |
| spellingShingle | Alessandra Adrover Claudia Venditti Antonio Brasiello A Non-Isothermal Moving-Boundary Model for Continuous and Intermittent Drying of Pears Foods intermittent dehydration shrinkage moving-boundary model non-isothermal drying |
| title | A Non-Isothermal Moving-Boundary Model for Continuous and Intermittent Drying of Pears |
| title_full | A Non-Isothermal Moving-Boundary Model for Continuous and Intermittent Drying of Pears |
| title_fullStr | A Non-Isothermal Moving-Boundary Model for Continuous and Intermittent Drying of Pears |
| title_full_unstemmed | A Non-Isothermal Moving-Boundary Model for Continuous and Intermittent Drying of Pears |
| title_short | A Non-Isothermal Moving-Boundary Model for Continuous and Intermittent Drying of Pears |
| title_sort | non isothermal moving boundary model for continuous and intermittent drying of pears |
| topic | intermittent dehydration shrinkage moving-boundary model non-isothermal drying |
| url | https://www.mdpi.com/2304-8158/9/11/1577 |
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