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| Amiri Chayjan, Reza; Fealekari, Mosayeb. |
| Abstract: Optimization of convective drying process of Persian shallot was investigated using dependent variables of effective moisture diffusivity (Deff), specific energy consumption (SEC), shrinkage and color changes. The central composite design (CCD) was selected for design and optimization of the process. The second-order polynomial models with transformed responses were developed from experimental data to generate three dimensional response surfaces and contour plots. Experiments were performed at air temperatures of 40°C, 55°C and 70°C, air velocities of 0.5, 1.5 and 2.5 m/s and slice thicknesses of 2, 4, and 6 mm in triplicate. Based on response surface and desirability functions, the optimum conditions for Persian shallot drying were: air... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Color; Diffusivity; Energy; Central composite design; Shrinkage. |
| Ano: 2014 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2807 |
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| DARIVA,Cláudio; COELHO,Luiz A. F.; OLIVEIRA,José V.. |
| In this work the Weeks-Chandler-Andersen (WCA) perturbation theory coupled with the Enskogs solution of the Boltzmann equation for dense hard-sphere fluids is employed for estimating diffusion coefficients in compressed pure liquids and fluids and dense fluid mixtures. The effect of density correction on the estimation of diffusivities is analyzed using the Carnahan-Starling pair correlation function and the correlation of Speedy and Harris which have been proposed as models of self-diffusion coefficient of hard-sphere fluids. The approach presented here is based on the smooth hard-sphere theory without any binary adjustable parameters and can be readily used for estimating diffusivities in multicomponent fluid mixtures. It is shown that the correlated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diffusivity; Perturbation theory; Dense liquids. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20611997000400023 |
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| SOARES,Maiara Aparecida Bomfim; JORGE,Luiz Mario de Matos; MONTANUCI,Flávia Daiana. |
| Abstract This study aimed to assess the drying kinetics of barley grains and, using mathematical modeling, to evaluate the diffusivity during drying and after drying to evaluate the effect of high drying temperatures on the seed germination index for malt production. Three drying temperatures 40, 60 and 80°C were used. The last two, 60 and 80°C, reached moisture close to ideal for storage with 6 and 4 hours respectively; at 40°C, drying process took 12 hours and would still take additional hours to reach 13% moisture on a dry basis. Drying temperature influenced the germination power. The protein content was reduced according to increased drying time. The diffusivity coefficient was higher in conventional than in intermittent drying, probably due to heat... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malt; Diffusivity; Thermal properties. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612016000400638 |
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| Morais,Maria F. de; Santos,José R. O. dos; Santos,Marisângela P. dos; Santos,Dyego da C.; Costa,Tiago N. da; Lima,Joel B.. |
| ABSTRACT This study aimed to dry ‘bacaba’ (Oenocarpus bacaba Mart.) pulp under different thermal conditions, fit different mathematical models to the dehydration curves, and calculate the diffusion coefficients, activation energy and thermodynamic properties of the process. ‘Bacaba’ fruits were meshed to obtain the pulp, which was dried at temperatures of 40, 50 and 60 °C and with thickness of 1.0 cm. Increase in drying temperature reduced the dehydration times, as well as the equilibrium moisture contents, and drying rates of 0.65, 1.04 and 1.25 kg kg min-1 were recorded at the beginning of the process for temperatures of 40, 50 and 60 °C, respectively. The Midilli’s equation was selected as the most appropriate to predict the drying phenomenon, showing... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oenocarpus bacaba Mart.; Dehydration; Diffusivity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000900702 |
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