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Transient Thermal Phenomena during Spontaneous Water Migration in Zeolite Beds

100%
Żołądek-Nowak J., Milczarek J., Fijał-Kirejczyk I., Żołądek J., Jurkowski Z.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
415-418
EN
The changes in local temperature occurring during spontaneous imbibition of columnar samples of dry natural zeolite with water were studied. The temperature pulses of 20-250 s duration and 3-40°C amplitude were registered and correlated with the wetting front motion observed with neutron radiography. The amplitude of the pulses was shown to increase with increasing ambient temperature. The broadening of the temperature pulse with increasing distance from the water supplied end of the samples was observed. The amplitude and the pulse width were found to depend substantially on the drying temperature of the material. The observed effect was attributed to the heat of immersion released in the sample at the moving wetting front.
2
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The Effect of Sodium Chloride on the Process of Drying of Porous Media

100%
Fijał-Kirejczyk I., Milczarek J., Jurkowski Z., Żołądek J.
Acta Physica Polonica A
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2013
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vol. 124
|
issue 6
1025-1028
EN
The high temperature drying process of corundum cylinders partially saturated with aqueous solutions of sodium chloride was investigated with neutron imaging technique accompanied with mass and temperature measurements. The statistical analysis of neutron images was applied in order to quantify the time evolution of the process. The substantial slowing down of drying with increasing salt concentration was found. This effect was attributed to increase of viscosity of the solution with increasing salt content as well as to the formation of an outer layer of NaCl on the sample surface.
3
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Drying Kinetics of Particulate Corundum Layers

100%
Cmiel K., Milczarek J., Bam L., Fijał-Kirejczyk I., Jurkowski Z., Żołądek J.
Acta Physica Polonica A
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2013
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vol. 124
|
issue 6
1029-1033
EN
The results of studies on drying of layers of particulate corundum performed with digital neutron radiography are presented. The statistical analysis of images was employed to reveal main features of the drying process. It is shown that the first period of drying proceeds within the whole body of the sample. Marked signatures of the end of first period of drying were found for sample mass, temperature, average image brightness as well as standard deviation of brightness time evolutions for the system composed of fine grains. The chaotic nature of this period is delineated by a distinct maximum in the standard deviation of sample image brightness. The presence of the drying front moving from the open surface to the sample bottom is proven to be an attribute of the advanced drying period.
4
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Application of Statistical Image Analysis in Quantification of Neutron Radiography Images of Drying

75%
Fijał-Kirejczyk I., Milczarek J., Żołądek-Nowak J., de Beer F., Radebe M., Nothnagel G.
Acta Physica Polonica A
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2012
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vol. 122
|
issue 2
410-414
EN
The statistical approach to the thermal neutron radiography picture analysis is applied to evaluation of the experimental results obtained for drying of rectangular and cylindrical samples of granulated and rigid porous materials. We have shown that the time dependence of the standard deviation of image brightness reflects the appearance and motion of the drying front observed during second period of the drying process. The results are discussed within a simple two-region model of the drying sample image.
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