Determination of the water absorption and water diffusion coefficients by means of infrared thermography measurements

Measurement ◽  
2021 ◽  
Vol 185 ◽  
pp. 110054
Author(s):  
Andrzej Marynowicz ◽  
Andrzej Kucharczyk
Keyword(s):  
Water Absorption ◽  
Infrared Thermography ◽  
Diffusion Coefficients ◽  
Water Diffusion

Water Absorption Characteristics of Obatanpa and Mamaba Maize Hybrids (Zea mays)

2006 ◽  
Vol 2 (3) ◽  
Author(s):  
Ahmad Addo ◽  
Ato Bart-Plange ◽  
Komla Dzisi
Keyword(s):  
Zea Mays ◽  
Diffusion Coefficient ◽  
Water Absorption ◽  
Diffusion Coefficients ◽  
Type Equation ◽  
Water Diffusion ◽  
Energy Of Activation ◽  
Absorption Kinetics ◽  
Maize Hybrids ◽  
Absorption Characteristics

Water absorption characteristics of two newly-released maize hybrids, Obatanpa and Mamaba, during soaking were measured at four temperatures of 30, 40, 50 and 60ºC. The absorption kinetics followed the Fick's law of diffusion during the first hours of soaking. The values determined for water diffusion coefficients varied from 7.31 x 10-12 to 9.33 x 10-12 m2/s and from 6.30 x 10-12 to 8.25 x 10-12 m2/s for Obatanpa and Mamaba respectively. An Arrhenius–type equation was used to relate the diffusion coefficient of Obatanpa and Mamaba to temperature, and the energy of activation for Obatanpa and Mamaba was estimated. The values determined were 6.54 kJ/mol and 6.82 kJ/mol for Obatanpa and Mamaba respectively.

Determination of water diffusion coefficients in perfluorosulfonate ionomeric membranes

1991 ◽  
Vol 95 (15) ◽  
pp. 6040-6044 ◽  
Author(s):  
Thomas A. Zawodzinski ◽  
Michal Neeman ◽  
Laurel O. Sillerud ◽  
Shimshon Gottesfeld
Keyword(s):  
Diffusion Coefficients ◽  
Water Diffusion

Influence of fungal infection on the long-term water absorption and morphological behavior of bagasse fiber/polypropylene composites at different exposure times

2013 ◽  
Vol 20 (4) ◽  
pp. 351-357 ◽  
Author(s):  
Behzad Kord ◽  
Seyyed Khalil Hosseinihashemi ◽  
Mehdi Modirzare
Keyword(s):  
Water Absorption ◽  
Diffusion Coefficients ◽  
Water Diffusion ◽  
White Rot ◽  
Fungal Decay ◽  
Melt Mixing ◽  
Polypropylene Composites ◽  
Bagasse Fiber ◽  
Control Samples

AbstractIn this study, the effect of fungal decay on the long-term water absorption of bagasse fiber/polypropylene composites at different exposure times was studied. For this purpose, the blend composites were prepared through the melt mixing of bagasse fiber with polypropylene at 40:60% weight ratios, with 2% coupling agent for all formulations. Then, the samples were exposed to brown-rot (Coniophora puteana) and white-rot (Trametes versicolor) fungal treatments for 8, 12 and 16 weeks with the Kolle flask method. The long-term water absorptions of samples were evaluated by immersing them in water at room temperature for several weeks, and water diffusion coefficients were also calculated by evaluating the water absorption isotherms. Also, the morphology of composites was characterized using scanning electron microscopy (SEM). The results showed that the water absorption of samples was actually much higher after both types of rotting and was significantly higher than that of control samples. Also, the water absorption of white-rotted samples was higher than that of brown-rotted and control samples for all weeks of fungal exposure times. In addition, the control sample and composite after 16 weeks of exposure to white-rot fungi exhibited the lowest and highest water diffusion coefficients, respectively. The mechanism of water absorption of samples against fungal decay at different exposure times followed the kinetics of a Fickian diffusion process. Furthermore, the SEM micrographs showed that the extent of degradation increased with increasing exposure time to fungus.

scholarly journals Quantification of glucose and glycerol diffusion in myocardium

2015 ◽  
Vol 08 (03) ◽  
pp. 1541006 ◽  
Author(s):  
Daria K. Tuchina ◽  
Alexey N. Bashkatov ◽  
Elina A. Genina ◽  
Valery V. Tuchin
Keyword(s):  
Diffusion Coefficients ◽  
Water Diffusion ◽  
Tissue Response ◽  
Tissue Fluid ◽  
Temporal Dependence ◽  
Measurement And Analysis

The results on determination of glucose and glycerol diffusion coefficients in myocardium tissue are presented. The method is based on the measurement and analysis of temporal dependence of tissue optical collimated transmittance under action of a hyperosmotic agent. This temporal tissue response is related to the rate of the agent and water diffusion in a tissue. The diffusion coefficients for tissue fluid fluxes at glucose and glycerol application to the myocardium at 20°C have been estimated as (4.75 ± 3.40) × 10-7 and (7.71 ± 4.63) × 10-7 cm2/s, respectively.

scholarly journals Modelling of the Water Absorption Kinetics and Determination of the Water Diffusion Coefficient in the Pith ofRaffia viniferaof Bandjoun, Cameroon

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
E. Tiaya Mbou ◽  
E. Njeugna ◽  
A. Kemajou ◽  
N. R. Tagne Sikame ◽  
D. Ndapeu
Keyword(s):  
Water Absorption ◽  
Diffusion Coefficients ◽  
Gravimetric Method ◽  
Water Diffusion ◽  
Radial Position ◽  
Absorption Kinetics ◽  
Absorption Phenomenon ◽  
Longitudinal Position ◽  
Percentage Of Water Absorption ◽  
Two Stages

The present work focuses on the study of the water absorption phenomenon through the pith ofRaffia viniferaalong the stem. The water absorption kinetics was studied experimentally by the gravimetric method with the discontinuous control of the sampling mass at temperature of 30°C. The samples of 70 mm × 8 mm × 4 mm were taken from twelve sampling zones of the stem ofRaffia vinifera. The result shows that the percentage of water absorption of the pith ofRaffia viniferaincreases from the periphery to the center in the radial position and from the base to the leaves in the longitudinal position. Fick’s second law was adopted for the study of the water diffusion. Eleven models were tested for the modelling of the water absorption kinetics and the model of Sikame Tagne (2014) is the optimal model. The diffusion coefficients of two stages were determined by the solution of the Fick equation in the twelve sampling zones described by Sikame Tagne et al. (2014). The diffusion coefficients decreased from the center to the periphery in the radial position and from the base to the leaves in the longitudinal position.

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