Inverse analysis of the transient bound water diffusion in wood

Holzforschung ◽  
2005 ◽  
Vol 59 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Wiesław Olek ◽  
Patrick Perré ◽  
Jerzy Weres
Keyword(s):  
Experimental Data ◽  
Diffusion Coefficients ◽  
Inverse Analysis ◽  
Bound Water ◽  
Water Diffusion ◽  
European Species ◽  
Alternative Approach ◽  
Transfer Problems ◽  
Bound Water Content ◽  
Water Diffusion Coefficient

Abstract The methods so far applied to determine the bound water diffusion coefficient in wood do not provide credible results on this coefficient as well as on the boundary condition. An alternative approach based on the concept of solving the inverse transfer problems was recently applied. Two European species were investigated in the present study. A series of sorption experiments was performed and followed by the numerical identification of the coefficients. Several case studies were carried out for the constant and bound water content dependent diffusion coefficients. The obtained results were validated by comparison to a set of experimental data.

Diffusion Coefficients of Interest for the Simulation of Heat Treatment in Rare-Earth Transition Metal Magnets

2012 ◽  
Vol 727-728 ◽  
pp. 163-168 ◽  
Author(s):  
Marcos Flavio de Campos
Keyword(s):  
Experimental Data ◽  
Heat Treatment ◽  
Activation Energy ◽  
Rare Earth ◽  
Transition Metal ◽  
Impurity Atom ◽  
Diffusion Coefficients ◽  
Arrhenius Equation ◽  
Atom Diffusion ◽  
Essential Input

In the case of the modeling of sintering and heat treatments, the diffusion coefficients are an essential input. However, experimental data in the literature about diffusion coefficients for rare-earth transition metal intermetallics is scarce. In this study, the available data concerning diffusion coefficients relevant for rare-earth transition metal magnets are reviewed and commented. Some empirical rules are discussed, for example the activation energy is affected by the size of the diffusing impurity atom. Diffusion coefficients for Dy, Nd and Fe into Nd2Fe14B are given according an Arrhenius equation D=D0exp (-Q/RT). For Dy diffusion into Nd2Fe14B, Q 315 kJ/mol and D08 . 10-4m2/s.

Capillary suction time (CST) as a measure of sludge dewaterability

1996 ◽  
Vol 34 (3-4) ◽  
pp. 443-448 ◽  
Author(s):  
G. W. Chen ◽  
W. W. Lin ◽  
D. J. Lee
Keyword(s):  
Water Content ◽  
Specific Resistance ◽  
Bound Water ◽  
The Other ◽  
Solid Concentration ◽  
Capillary Suction ◽  
Good Index ◽  
Other Hand ◽  
Sludge Dewaterability ◽  
Bound Water Content

The feasibility of employment of capillary suction time (CST) for characterizing the dewaterability of excess activated sludges was examined. The CST was shown as a good index for sludge filterability, if only the product of solid concentration and average specific resistance is of interest. On the other hand, the bound water content cannot be directly evaluated from the CST data.

Formalin fixation alters water diffusion coefficient magnitude but not anisotropy in infarcted brain

2005 ◽  
Vol 53 (6) ◽  
pp. 1447-1451 ◽  
Author(s):  
Shu-Wei Sun ◽  
Jeffrey J. Neil ◽  
Hsiao-Fang Liang ◽  
Yong Y. He ◽  
Robert E. Schmidt ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Water Diffusion ◽  
Formalin Fixation ◽  
Water Diffusion Coefficient

scholarly journals Bound Water Content of Vegetative and Spore Forms of Bacteria

1938 ◽  
Vol 36 (1) ◽  
pp. 99-105 ◽  
Author(s):  
C. A. Friedman ◽  
B. S. Henry
Keyword(s):  
Water Content ◽  
Bound Water ◽  
Bound Water Content

scholarly journals Studies on the Maximum Bound Water Content by the Differential Scanning Calorimetry on Lipstick

2012 ◽  
Vol 38 (3) ◽  
pp. 197-200
Author(s):  
Khee-Hwan Choi ◽  
Myung-Jin Ann ◽  
Hong-Ha Son ◽  
Kyong-Seub Kim ◽  
Sang-Min Lee ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Water Content ◽  
Bound Water ◽  
Scanning Calorimetry ◽  
Bound Water Content

scholarly journals Anisotropic Diffusion and the Townsend?Huxley Experiment

1973 ◽  
Vol 26 (4) ◽  
pp. 469 ◽  
Author(s):  
JJ Lowke
Keyword(s):  
Experimental Data ◽  
Electric Field ◽  
Electron Mobility ◽  
Diffusion Coefficients ◽  
Applied Electric Field ◽  
Anisotropic Diffusion ◽  
Diffusion Tubes ◽  
New Formula ◽  
The Relationship ◽  
Diffusion Tube

The relationship between current ratios and electron diffusion coefficients for the Townsend-Huxley experiment is reanalysed with the assumption that diffusion can be represented by two coefficients DT and DL for diffusion transverse and parallel respectively to the applied electric field. When the new formula is used to interpret previous experimental data obtained with a diffusion tube of length 2 cm, the derived values of DT/fl become independent of pressure (fl being the electron mobility). For longer diffusion tubes (~ 6 cm), current ratios are insensitive to DL and the results differ insignificantly from those obtained using the formula previously derived on the assumption that diffusion is isotropic.

Sign in / Sign up

Export Citation Format

Share Document