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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.
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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.
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Application of Statistical Image Analysis in Quantification of Neutron Radiography Images of Drying

86%
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
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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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