scholarly journals Description of Guava Osmotic Dehydration Using a Three-Dimensional Analytical Diffusion Model

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Wilton Pereira da Silva ◽  
Cleide M. D. P. S. e Silva ◽  
Kalina Lígia Cavalcante de Almeida Farias Aires
Keyword(s):  
Effective Mass ◽  
Diffusion Model ◽  
Inverse Method ◽  
Osmotic Dehydration ◽  
Three Dimensional ◽  
Mass Distributions ◽  
Dimensional Diffusion ◽  
Proposed Model ◽  
Two Temperatures ◽  
Kinetics Of

The mass migrations during osmotic dehydration of guava were studied. Parallelepiped shaped slices were dipping in syrup of distilled water and sucrose with two concentrations and two temperatures. It was supposed that a three-dimensional diffusion model with boundary condition of the first kind satisfactorily describes the mass migrations and that the volume and effective mass diffusivities can be assumed constant during the process. The effective mass diffusivities were determined by coupling the three-dimensional analytical solution of the diffusion equation with an optimizer based on the inverse method. The proposed model well described the kinetics of water and sucrose migrations and enabled determining the mass distributions (water and sucrose) within the product at any instant.

Osmotic dehydration of cubic pieces of melon: description through a three-dimensional diffusion model considering the resistance to mass flows on the surface

2020 ◽  
Author(s):  
Rubens Maciel Miranda Pinheiro ◽  
Wilton Pereira da Silva ◽  
Denise Silva do Amaral Miranda ◽  
Cleide M. D. P. S. eSilva ◽  
Taciano Pessoa
Keyword(s):  
Diffusion Model ◽  
Osmotic Dehydration ◽  
Three Dimensional ◽  
Dimensional Diffusion ◽  
Mass Flows

Three-dimensional diffusion model for austenitisation of ferritic spheroidal graphite irons

1999 ◽  
Vol 15 (9) ◽  
pp. 1024-1030 ◽  
Author(s):  
J. Zimba ◽  
D. Henwood ◽  
E. Navara ◽  
D.J. Simbi
Keyword(s):  
Diffusion Model ◽  
Three Dimensional ◽  
Spheroidal Graphite ◽  
Dimensional Diffusion

Devitrification kinetics and mechanism of Pyrex borosilicate glass

2001 ◽  
Vol 16 (6) ◽  
pp. 1752-1758 ◽  
Author(s):  
Jau-Ho Jean ◽  
Yu-Ching Fang
Keyword(s):  
Borosilicate Glass ◽  
Linear Growth ◽  
Energy Analysis ◽  
Three Dimensional ◽  
Rate Limiting Step ◽  
Dimensional Diffusion ◽  
Limiting Step ◽  
Diffusion Controlled ◽  
Rate Limiting ◽  
Kinetics Of

Cristobalite is formed when initially amorphous Pyrex borosilicate glass (Corning 7740) is fired at temperatures ranging from 700 to 1000 °C. The sigmoidal devitrification kinetics of cristobalite obeys Avrami-like three-dimensional diffusion-controlled kinetics. Activation energy analysis indicates that the diffusion of Na+ in the glass is the rate-limiting step during phase transformation. The above conclusion is further confirmed by calculated and measured results of linear growth rates.

Description of Osmotic Dehydration of Melon Cubes using a Three-dimensional Diffusion Model: An Algorithm to Determine the Effective Diffusivity

2017 ◽  
Vol 13 (12) ◽  
Author(s):  
Rubens Maciel Miranda Pinheiro ◽  
Wilton Pereira da Silva ◽  
Denise Silva do Amaral Miranda ◽  
Cleide M. D. P. S. e Silva ◽  
Taciano Pessoa ◽  
...  
Keyword(s):  
Experimental Data ◽  
Objective Function ◽  
Effective Mass ◽  
Osmotic Dehydration ◽  
Three Dimensional ◽  
Effective Diffusivity ◽  
Chi Square ◽  
Minimum Value ◽  
Mass Diffusivity ◽  
Optimal Value

AbstractThis paper aims to study the transient mass diffusion during the osmotic dehydration of melon cubes, using the analytical solution of the diffusion equation with boundary condition of the first kind. Two techniques are used to determine the effective mass diffusivity, using experimental data. In technique 1, available in the literature, the domain of the effective diffusivity is scanned from a value close to zero, until the minimum value of the objective function (Chi-square) is determined. Technique 2, proposed in this paper, uses an algorithm based on the optimal removal of experimental points, until obtaining the objective function with a minimum value, allowing to determine the optimal value for the effective mass diffusivity. The obtained values for diffusivity and statistical indicators revealed that both techniques generate equivalent results and allowed to satisfactorily describe the kinetics of osmotic dehydration of melon cubes. However, technique 2, proposed in this paper, is much faster than technique 1, in the determination of effective mass diffusivity, for all analyzed sets of experimental data.

GIS-Based Emergency Management System for Chemical Industry Park

2012 ◽  
Vol 550-553 ◽  
pp. 2941-2944 ◽  
Author(s):  
Yun Yun Li ◽  
Xiao Qin Shang ◽  
Ru Feng Liu
Keyword(s):  
Diffusion Model ◽  
Emergency Response ◽  
Three Dimensional ◽  
Gaussian Plume Model ◽  
Environment Problem ◽  
Dimensional Diffusion ◽  
Gaussian Plume ◽  
The Common ◽  
The Impact ◽  
Crucial Part

The chemical industrial park’s quick development has brought out many security and environment problem. For the common leakage accidents, it is urgently needed to build emergency response decision support system. The analysis of the accident is the crucial part of the system, in this paper the method of integrating GIS with diffusion model was used to simulate the three-dimensional diffusion process and predict the impact scope of the accident. The Pasquill-Gifford model and Gaussian diffusion model was introduced; Gaussian plume model was applied through the example to illustrate the method. The system is not just convenient for drawing up critical situation pre-arranged planning, but could offer timely assistant decision for emergency command.

scholarly journals Identifying Radiation Belt Electron Source and Loss Processes by Assimilating Spacecraft Data in a Three‐Dimensional Diffusion Model

2020 ◽  
Vol 125 (1) ◽  
Author(s):  
S. Cervantes ◽  
Y. Y. Shprits ◽  
N. A. Aseev ◽  
A. Y. Drozdov ◽  
A. Castillo ◽  
...  
Keyword(s):  
Diffusion Model ◽  
Radiation Belt ◽  
Three Dimensional ◽  
Electron Source ◽  
Dimensional Diffusion ◽  
Spacecraft Data
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