Modelling of rheological behaviour of macaíba pulp at different temperatures
ABSTRACT Fruit pulps undergo temperature variations during processing, leading to viscosity changes. This study aimed to analyse the rheological behaviour of macaíba pulp at different temperatures (10 to 50 ºC, with 5 ºC increments) and speeds (2.5 to 200 rpm, totalling 17 speeds). Experimental meas...
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Universidade Federal de Campina Grande
2022-01-01
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| Series: | Revista Brasileira de Engenharia Agrícola e Ambiental |
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| author | Jéssica L. O. Brasileiro Rossana M. F. de Figueirêdo Alexandre J. de M. Queiroz Regilane M. Feitosa |
| author_facet | Jéssica L. O. Brasileiro Rossana M. F. de Figueirêdo Alexandre J. de M. Queiroz Regilane M. Feitosa |
| author_sort | Jéssica L. O. Brasileiro |
| collection | DOAJ |
| description | ABSTRACT Fruit pulps undergo temperature variations during processing, leading to viscosity changes. This study aimed to analyse the rheological behaviour of macaíba pulp at different temperatures (10 to 50 ºC, with 5 ºC increments) and speeds (2.5 to 200 rpm, totalling 17 speeds). Experimental measurements were performed in a Brookfield viscometer, fitting the Ostwald-de-Waele, Mizrahi-Berk, Herschel-Bulkley, and Casson models to the experimental data of shear stress as a function of shear rate. Among the models used, the Mizrahi-Berk model (R² > 0.9656 and average percentage deviation - P ≤ 4.1%) was found to best fit the rheogram data. Macaíba pulp exhibited a non-newtonian behaviour and was characterised as pseudoplastic. It showed fluid behaviour indexes below unity under the studied conditions, with decreases in apparent viscosity as temperature and shear rate increased. Such behaviour could be described by the Arrhenius equation. The Mizrahi-Berk and Falguera-Ibarz models (R² > 0.99 and P ≤ 10%) best fitted the data and were used to represent the viscosity behaviour of macaíba pulp. The activation energy values of macaíba pulp ranged between 17.53 and 25.37 kJ mol-1, showing a rheological behaviour like other fruit pulps. |
| format | Article |
| id | doaj-art-48c88d8e7cef488a837de098e17614fe |
| institution | Kabale University |
| issn | 1807-1929 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Universidade Federal de Campina Grande |
| record_format | Article |
| series | Revista Brasileira de Engenharia Agrícola e Ambiental |
| spelling | doaj-art-48c88d8e7cef488a837de098e17614fe2025-08-20T03:36:47ZengUniversidade Federal de Campina GrandeRevista Brasileira de Engenharia Agrícola e Ambiental1807-19292022-01-0126319820310.1590/1807-1929/agriambi.v26n3p198-203Modelling of rheological behaviour of macaíba pulp at different temperaturesJéssica L. O. Brasileirohttps://orcid.org/0000-0003-0423-064XRossana M. F. de Figueirêdohttps://orcid.org/0000-0002-6187-5826Alexandre J. de M. Queirozhttps://orcid.org/0000-0002-6880-5951Regilane M. Feitosahttps://orcid.org/0000-0003-2627-0933ABSTRACT Fruit pulps undergo temperature variations during processing, leading to viscosity changes. This study aimed to analyse the rheological behaviour of macaíba pulp at different temperatures (10 to 50 ºC, with 5 ºC increments) and speeds (2.5 to 200 rpm, totalling 17 speeds). Experimental measurements were performed in a Brookfield viscometer, fitting the Ostwald-de-Waele, Mizrahi-Berk, Herschel-Bulkley, and Casson models to the experimental data of shear stress as a function of shear rate. Among the models used, the Mizrahi-Berk model (R² > 0.9656 and average percentage deviation - P ≤ 4.1%) was found to best fit the rheogram data. Macaíba pulp exhibited a non-newtonian behaviour and was characterised as pseudoplastic. It showed fluid behaviour indexes below unity under the studied conditions, with decreases in apparent viscosity as temperature and shear rate increased. Such behaviour could be described by the Arrhenius equation. The Mizrahi-Berk and Falguera-Ibarz models (R² > 0.99 and P ≤ 10%) best fitted the data and were used to represent the viscosity behaviour of macaíba pulp. The activation energy values of macaíba pulp ranged between 17.53 and 25.37 kJ mol-1, showing a rheological behaviour like other fruit pulps.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662022000300198&tlng=enAcrocomia intumescensapparent viscositynon-newtonian fluidpseudoplasticArrhenius equation |
| spellingShingle | Jéssica L. O. Brasileiro Rossana M. F. de Figueirêdo Alexandre J. de M. Queiroz Regilane M. Feitosa Modelling of rheological behaviour of macaíba pulp at different temperatures Revista Brasileira de Engenharia Agrícola e Ambiental Acrocomia intumescens apparent viscosity non-newtonian fluid pseudoplastic Arrhenius equation |
| title | Modelling of rheological behaviour of macaíba pulp at different temperatures |
| title_full | Modelling of rheological behaviour of macaíba pulp at different temperatures |
| title_fullStr | Modelling of rheological behaviour of macaíba pulp at different temperatures |
| title_full_unstemmed | Modelling of rheological behaviour of macaíba pulp at different temperatures |
| title_short | Modelling of rheological behaviour of macaíba pulp at different temperatures |
| title_sort | modelling of rheological behaviour of macaiba pulp at different temperatures |
| topic | Acrocomia intumescens apparent viscosity non-newtonian fluid pseudoplastic Arrhenius equation |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662022000300198&tlng=en |
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