Effective diffusion coefficients for oxidation of zinc sulphide pellets

1984 ◽  
Vol 62 (3) ◽  
pp. 363-366 ◽  
Author(s):  
T. Rajeswara Rao
Keyword(s):  
Diffusion Coefficients ◽  
Effective Diffusion ◽  
Zinc Sulphide ◽  
Effective Diffusion Coefficients

Direct measurement of effective diffusion coefficients in nanochannels using steady-state dispersion effects

2007 ◽  
Vol 91 (20) ◽  
pp. 203106 ◽  
Author(s):  
Nicolas F. Y. Durand ◽  
Arnaud Bertsch ◽  
Mina Todorova ◽  
Philippe Renaud
Keyword(s):  
Steady State ◽  
Direct Measurement ◽  
Diffusion Coefficients ◽  
Effective Diffusion ◽  
Effective Diffusion Coefficients ◽  
Dispersion Effects

Effective Diffusion Coefficients and Thermal Stability of the Structure of Metallic Glass Fe48Co32P14B6

2020 ◽  
Vol 62 (12) ◽  
pp. 2258-2265 ◽  
Author(s):  
S. V. Vasiliev ◽  
V. I. Parfenii ◽  
E. A. Pershina ◽  
A. S. Aronin ◽  
O. V. Kovalenko ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Metallic Glass ◽  
Diffusion Coefficients ◽  
Effective Diffusion ◽  
Effective Diffusion Coefficients ◽  
Thermal Stability Of

Finite size corrections on the estimation of the effective diffusion coefficients through the dynamical behavior of the diffusion zone during gaseous nitriding of pure iron

2021 ◽  
pp. 101096
Author(s):  
Ernesto M. Hernández-Cooper ◽  
Rubén Darío Santiago-Acosta ◽  
F. Castillo-Aranguren ◽  
Joaquín E. Oseguera-Peña ◽  
Dulce V. Melo-Máximo ◽  
...  
Keyword(s):  
Diffusion Zone ◽  
Diffusion Coefficients ◽  
Pure Iron ◽  
Dynamical Behavior ◽  
Effective Diffusion ◽  
Finite Size ◽  
Effective Diffusion Coefficients ◽  
Gaseous Nitriding ◽  
Finite Size Corrections

scholarly journals Modeling and thermodynamic properties of ‘bacaba’ pulp drying

2019 ◽  
Vol 23 (9) ◽  
pp. 702-708 ◽  
Author(s):  
Maria F. de Morais ◽  
José R. O. dos Santos ◽  
Marisângela P. dos Santos ◽  
Dyego da C. Santos ◽  
Tiago N. da Costa ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermodynamic Properties ◽  
Diffusion Coefficients ◽  
Effective Diffusion ◽  
Thermal Conditions ◽  
Drying Process ◽  
Experimental Conditions ◽  
Effective Diffusion Coefficients ◽  
Drying Rates ◽  
Increasing Temperature

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 the highest R2, lowest values of mean square deviation (MSD) and χ2 under most thermal conditions, and random distribution of residuals under all experimental conditions. The effective diffusion coefficients increased with increasing temperature, with magnitudes of the order of 10-9 m2 s-1, being satisfactorily described by the Arrhenius equation, which showed activation energy (Ea) of 37.01 kJ mol-1. The drying process was characterized as endergonic, in which enthalpy (ΔH) and entropy (ΔS) reduced with the increment of temperature, while Gibbs free energy (ΔG) was increased.

Measurement of effective diffusion coefficients in dairy powders by confocal microscopy and sorption kinetic profiles

2019 ◽  
Vol 20 ◽  
pp. 100108 ◽  
Author(s):  
Valentyn Maidannyk ◽  
Eva Lutjes ◽  
Sharon Montgomery ◽  
Noel McCarthy ◽  
Mark A.E. Auty
Keyword(s):  
Confocal Microscopy ◽  
Diffusion Coefficients ◽  
Effective Diffusion ◽  
Sorption Kinetic ◽  
Effective Diffusion Coefficients ◽  
Dairy Powders
Sign in / Sign up

Export Citation Format

Share Document