The Experts below are selected from a list of 13794 Experts worldwide ranked by ideXlab platform
Marcos A.s. Barrozo - One of the best experts on this subject based on the ideXlab platform.
-
Drying Kinetics of Silica Gel: Statistical Discrimination Using Nonlinearity Measures
Chemical Engineering & Technology, 2012Co-Authors: G.f.m.v. Souza, R.f. Miranda, E. B. Arruda, O. S. H. Mendoza, Marcos A.s. BarrozoAbstract:The objective of the present work was to analyze the Drying Kinetics of silica gel based on an experimental study performed in a thin-layer dryer and a statistical discrimination of the main Drying kinetic equations. Most semi-empirical Drying Kinetics equations presented in the literature are nonlinear; thus, care should be taken when estimating parameters, since in some situations the estimators may not be appropriate. There are procedures available to validate the statistical properties of the least squares estimators of nonlinear models. In this study, five semi-empirical Drying Kinetics equations were discriminated using measures of curvature and bias. The results showed that the Overhults equation is the best one to describe the Drying Kinetics of silica gel.
-
a study of the statistical discrimination of the Drying Kinetics equations
Food and Bioproducts Processing, 2004Co-Authors: Marcos A.s. Barrozo, D J M Sartori, José Teixeira FreireAbstract:The Drying Kinetics of soybean seeds in a thin layer were studied in this work. In the thin layer Drying experiments, air of constant humidity and a range of temperature and mass flowrate conditions, flowed through a thin layer of the wet material. The Drying behaviour of the material was observed over a period of time. Most kinetic equations presented in the literature are nonlinear, so care should be taken when estimating parameters, since in some situations the estimators may not be appropriate. There are some procedures available to validate the statistical properties of the least squares estimators of nonlinear models. In this paper, the most important semi-empirical Drying Kinetics equations are considered and, by examining a experimental data set, through nonlinearity measures, the best equation is identified. The results for curvature measures, bias measures and simulation studies showed that the only equation that gives good inference results, based on least squares estimators, is the Overhults equation.
Christine Benard - One of the best experts on this subject based on the ideXlab platform.
-
Drying Kinetics of polymer films
AIChE Journal, 1998Co-Authors: Béatrice Guerrier, Charles Bouchard, Catherine Allain, Christine BenardAbstract:Drying Kinetics of a polymer film cast from a polymer - solvent solution is studied. A modelization of the whole Drying process is performed, including the diffusion of solvent through the varnish layer, the moving interface, and the coupled heat and mass transfer between the interface and the Drying air. The assumptions and the validity domain of the proposed modelization are thoroughly analyzed. In particular, comparison of the varnish temperature with its glass transition temperature all along the process allows us to determine the validity domain of the Fickian diffusion assumption. Because of the hypodiffusive behavior of polymer solutions, very large concentration gradients appear in the layer, and the Drying Kinetics is characterized by two successive regimes. This two-stage Kinetics is investigated first for typical conditions encountered in the packaging industry, where a film of a few microns is dried in a few seconds, thanks to hot air blown through nozzles. Then, different Drying conditions corresponding to evaporation experiments at room temperature of thicker films of the same varnish are studied.
José Teixeira Freire - One of the best experts on this subject based on the ideXlab platform.
-
THE INFLUENCE OF VIBRATIONAL ACCELERATION ON Drying Kinetics IN VIBRO-FLUIDIZED BED
Chemical Engineering and Processing: Process Intensification, 2017Co-Authors: Hugo Perazzini, Fábio Bentes Freire, José Teixeira FreireAbstract:Abstract This present work aims to analyze the Drying Kinetics of alumina particles in vibro-fluidized bed dryer. Observed Drying kinetic data were predicted by the empirical Page model. Parameters of the model were estimated for different operating conditions and it was used to evaluate the universality of the dimensionless vibrating parameter. It was obtained different values of the parameters of the Page model for similar values of this vibrating parameter, leading to different Drying Kinetics, once it depends on the different combinations of amplitude and frequency of vibration. It was concluded that the dimensionless parameter is not unique to set the vibrational effect on Drying Kinetics.
-
a study of the statistical discrimination of the Drying Kinetics equations
Food and Bioproducts Processing, 2004Co-Authors: Marcos A.s. Barrozo, D J M Sartori, José Teixeira FreireAbstract:The Drying Kinetics of soybean seeds in a thin layer were studied in this work. In the thin layer Drying experiments, air of constant humidity and a range of temperature and mass flowrate conditions, flowed through a thin layer of the wet material. The Drying behaviour of the material was observed over a period of time. Most kinetic equations presented in the literature are nonlinear, so care should be taken when estimating parameters, since in some situations the estimators may not be appropriate. There are some procedures available to validate the statistical properties of the least squares estimators of nonlinear models. In this paper, the most important semi-empirical Drying Kinetics equations are considered and, by examining a experimental data set, through nonlinearity measures, the best equation is identified. The results for curvature measures, bias measures and simulation studies showed that the only equation that gives good inference results, based on least squares estimators, is the Overhults equation.
Wang Bao-he - One of the best experts on this subject based on the ideXlab platform.
-
Thermal Analysis Kinetics Technology and Its Applications in Drying Kinetics Research
Drying Technology & Equipment, 2011Co-Authors: Wang Bao-heAbstract:In this paper, the theory of thermal analysis Kinetics was simply introduced. Subsequently, the present application of isothermal and non-isothermal thermal analysis Kinetics to the Drying Kinetics was reviewed. In the end, the development trend of the thermal analysis Kinetics in Drying Kinetics was prospected.
-
Drying Kinetics of Basic Magnesium Carbonate Nanoflowers Based on Thin-layer Drying Model
Drying Technology & Equipment, 2010Co-Authors: Wang Bao-heAbstract:Drying Kinetics experiments of basic magnesium carbonate nanoflowers were performed,and the Drying curves,as well as the Drying rate curves were obtained at different Drying medium temperatures and different materiel bed-layer thicknesses,respectively.The experimental data of Drying Kinetics for basic magnesium carbonate nanoflowers were treated with thin-layer Drying models,then the Drying Kinetics equation and parameters were obtained including the Drying equation M_R = exp[-(kt)~n],the Drying rate equation -dM_R/dt= knM_R(-lnM_R)~(n-1/n),the Drying rate constant k=A exp[-E_v(1+C_LL)/RT,the Drying time index n =1.738,the activation energy of interface evaporation E_v=16.521kJ/mol,the pre-exponential factor A =7.214min~(-1) and the experiential constant C_L =29.900 m~(-1).
-
Research on the Drying Kinetics of Basic Magnesium Chloride Nanorods
Drying Technology & Equipment, 2009Co-Authors: Wang Bao-heAbstract:Basic magnesiumchloride nanorods with length about 10μmand diameter range of100～150nmwere prepared by liquid phase method with magnesium chloride hexahydrate and light magnesium oxide as raw materials. Through Drying Kinetics experiments, the Drying curves and Drying rate curves of basic magnesium chloride nanorods were obtained. The experimental data of Drying Kinetics for basic magnesium chloride nanorods were treated with thin layer Drying models and thermal analysis Kinetics method. The Drying equation, the Drying rate equation, the pre- exponential factor A and the apparent activation energy E were achieved.
-
A Study on the Characteristics of Drying Kinetics of Magnesium Hydroxide Nanorods
Chemical Engineering & Machinery, 2009Co-Authors: Wang Bao-heAbstract:The basic magnesium chloride nanorods were used as a precursor to synthesize the magnesium hydroxide nanorods with a diameter range of 100~150nm and average length of 3~5μm through precipitation conversion method,the Drying curve and Drying speed rate curve of magnesium hydroxide nanorods under 80~160℃ were derived through an isothermal Drying Kinetics experiment. The experimental data of isothermal Drying Kinetics were simulated using a thin-layer Drying model,and the Drying equation and Drying speed rate equation of magnesium hydroxide nanorods were derived; the experimental data of isothermal Drying Kinetics were simulated using the thermal analysis Kinetics method,and the Drying integral mechanism function,Drying equation,Drying speed rate equation,apparent activation energy,and pre-exponential factor were obtained.
Béatrice Guerrier - One of the best experts on this subject based on the ideXlab platform.
-
Drying Kinetics of polymer films
AIChE Journal, 1998Co-Authors: Béatrice Guerrier, Charles Bouchard, Catherine Allain, Christine BenardAbstract:Drying Kinetics of a polymer film cast from a polymer - solvent solution is studied. A modelization of the whole Drying process is performed, including the diffusion of solvent through the varnish layer, the moving interface, and the coupled heat and mass transfer between the interface and the Drying air. The assumptions and the validity domain of the proposed modelization are thoroughly analyzed. In particular, comparison of the varnish temperature with its glass transition temperature all along the process allows us to determine the validity domain of the Fickian diffusion assumption. Because of the hypodiffusive behavior of polymer solutions, very large concentration gradients appear in the layer, and the Drying Kinetics is characterized by two successive regimes. This two-stage Kinetics is investigated first for typical conditions encountered in the packaging industry, where a film of a few microns is dried in a few seconds, thanks to hot air blown through nozzles. Then, different Drying conditions corresponding to evaporation experiments at room temperature of thicker films of the same varnish are studied.
