Abstract:The changes in local temperature occurring during spontaneous imbibition of columnar samples of dry natural zeolite with water were studied. The temperature pulses of 20250 s duration and 340 • 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 … Show more
“…Recently, spontaneous infiltration experiments were performed by Zoladek-Nowak et al . 12 , with water rising into a column by capillarity. They introduced water into the bottom reservoir of a column of dry natural zeolite grains.…”
Section: Introductionmentioning
confidence: 99%
“… Figure 11 Temperature as a function of time in experiments of zoldak- Nowak et al . 12 . Two diagrams in the right were done on Zeolite pickings treated in 100 °C and ambient temperature 50 and 70 °C.…”
It is reported that temperature rises at wetting front during water infiltration into soil. The temperature goes back to the background value after passage of water front. Different explanations have been provided for source of energy causing temperature spike. Some have contributed it to heat of condensation released due to condensation of vapor on “dry” solid surface. Some other stated that the heat of wetting or heat of adsorption is responsible for the temperature rise. In this research, we revisited this issue. First, we provide a comprehensive review about occurrence of temperature spike at a wetting front. Then, we report about experiments we performed on the rise of water in dry paper. Using infrared and optical imaging techniques, we could monitor temperature changes in time and space. For all samples maximum temperature rise occurred at the wetting front. The magnitude of temperature spike depended on paper material, thickness, and liquid composition. It was larger for cellulose-fiber-based paper than for plastic-based paper. For a given paper type, thicker samples showed a larger temperature spike. Adding salt to the water caused reduction of temperature spike. It was concluded that replacement of air-solid interface with water-solid interface releases energy, which causes temperature rise.
“…Recently, spontaneous infiltration experiments were performed by Zoladek-Nowak et al . 12 , with water rising into a column by capillarity. They introduced water into the bottom reservoir of a column of dry natural zeolite grains.…”
Section: Introductionmentioning
confidence: 99%
“… Figure 11 Temperature as a function of time in experiments of zoldak- Nowak et al . 12 . Two diagrams in the right were done on Zeolite pickings treated in 100 °C and ambient temperature 50 and 70 °C.…”
It is reported that temperature rises at wetting front during water infiltration into soil. The temperature goes back to the background value after passage of water front. Different explanations have been provided for source of energy causing temperature spike. Some have contributed it to heat of condensation released due to condensation of vapor on “dry” solid surface. Some other stated that the heat of wetting or heat of adsorption is responsible for the temperature rise. In this research, we revisited this issue. First, we provide a comprehensive review about occurrence of temperature spike at a wetting front. Then, we report about experiments we performed on the rise of water in dry paper. Using infrared and optical imaging techniques, we could monitor temperature changes in time and space. For all samples maximum temperature rise occurred at the wetting front. The magnitude of temperature spike depended on paper material, thickness, and liquid composition. It was larger for cellulose-fiber-based paper than for plastic-based paper. For a given paper type, thicker samples showed a larger temperature spike. Adding salt to the water caused reduction of temperature spike. It was concluded that replacement of air-solid interface with water-solid interface releases energy, which causes temperature rise.
“…Gas molecules that adsorb onto a wetting surface are at a lower chemical potential than the bulk state, releasing thermal energy. The cage-like structure of zeolites may present an even lower chemical potential than planar surfaces, resulting in a comparatively large release of energy for vapor adsorption (Żołądek-Nowak et al, 2012).…”
During characterization efforts of complex sites and geologies, it is
important to estimate material properties efficiently and robustly. We
present data and modeling related to the heat of wetting process during
spontaneous imbibition, as observed in zeolitic tuff. The heat of
wetting is due to adsorption of liquid water and water vapor to an
oven-dry core sample and results in an observable temperature rise. The
fitting of numerical models to imbibition observations allows
simultaneous constraint of single-phase (porosity, permeability),
two-phase (van Genuchten m and alpha), thermal (thermal diffusivity),
and transport (tortuosity) properties from a single imbibition test.
Petrographic analysis informs how microstructure connectivity and
pore-lining phases affect the imbibition process. Estimating multiple
properties simultaneously from a single test on a core sample helps
ensure consistency in interpreted material properties. SNL is managed
and operated by NTESS under DOE NNSA contract DE-NA0003525
(SAND2023-07021A).
“…The theory governing this thermal-hydrological process has been discussed in soil science (Edlefsen & Anderson, 1943;Ten Berge & Bolt;1988), hydrology (de Vries, 1958), paper microfluidics (Murali et al, 2020), and grain storage (Thorpe & Whitaker, 1992). Experimental data have been presented in the literature for imbibition into or immersion of paper (Foss et al, 2003;Aslannejad et al, 2017;Terzis et al, 2018;Murali et al, 2020), textiles (Bright et al, 1953), glass beads (Perrier & Prakash, 1977), starch (Janert, 1934), wood (Hearmon & Burcham, 1955), loamy and clay soils (Anderson & Linville, 1962;Prunty & Bell, 2005), zeolite (Żoła̧dek-Nowak et al, 2012), coal (Nordon & Bainbridge, 1983), and clay (Anderson & Linville, 1960). The heat of wetting effect is used in immersion calorimetry to estimate rock wettability in oil-water systems (Korobkov et al, 2016) and colloidal content in soils (Anderson, 1924).…”
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