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Krenologia obszarów młodoglacjalnych na przykładzie Pojezierza Lubuskiego – przegląd badań

100%
SZCZUCIŃSKA A., MARCINIAK M., PŁOCIENNICZAK J.
Badania Fizjograficzne Seria A - Geografia Fizyczna
|
2019
|
issue 10(70)
119-132
EN
The Polish Lowland is an area with rare and relatively poorly studied springs. The present paper review results of recent studies on springs, their hydrology and environments on Lubuskie Lakeland (5.200 km2) in western part of the Polish Lowland. This area contains over 1,000 springs and seepages outflowing from porous sediments. Most of them are related to thick Pleistocene sediments containing several groundwater bearing layers, which are cut by deep subglacial channels (tunnel valleys). The spring density index is the highest in catchment of the Gryżynka River, with up to 4.8 individual springs and seepages per 1 km2. The most common in the Lubuskie Lakeland are seepages (65%), descending and hillslope outflows. Their water discharge varies from < 0.001 to 50 000 dm3/s. Hydrochemistry of spring waters is dominated by calcium and bicarbonate ions, as well as high concentrations of iron and manganese. Due to the lack of a surface insulation layer, contaminants (various forms of nitrogen) easily migrate to groundwater. Generally, the spring waters have good quality. Moreover continuous observations of the water surface levels in spring supplied water bodies revealed daily fluctuations, which are likely due to evapotranspiration and changes of the filtration coefficient in hyporheic zone.
2
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Modeling of flow and mass transport in granular porous media

99%
Coutelieris F.
Open Physics
|
2011
|
vol. 9
|
issue 4
962-968
EN
The scope of this work is to estimate the effective mass-transfer coefficient in a two-phase system of oil and water fluid droplets, both being in a porous medium. To this end, a tracer is advected from the flowing aqueous phase to the immobile non-aqueous one. Partitioning at the fluid-fluid interface and surface diffusion are also taken into account. By using spatial/volume-averaging techniques, the appropriately simplified boundary-value problems are described and numerically solved for the flow velocity field and for the transport problem. The problem was found to be controlled by the Peclet number of the flowing phase, the dimensionless parameter Λ, containing both diffusion and partition in the two phases, as well as the geometrical properties of the porous structure. It is also verified that the usually involved unit cell-configurations underestimate the mass transport to the immobile phase.
3
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Empirical investigation of two designs of incline solar water desalination system

85%
Agboola P., Egelioglu F.
Polish Journal of Chemical Technology
|
2012
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vol. 14
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issue 1
35-40
EN
This paper presents an experimental investigation of two incline solar water desalination (ISWD) systems. One design uses spray jets for spraying water onto the absorber plate, while the other uses a longitudinal slot for getting the inlet water on the absorber plate. The first ever ISWD system constructed and tested by Aybar et al (2005) used the longitudinal slot with a maximum daily production of 2.995 kg/m2 day. The Aybar et al design produced 3.4 kg/m2-day while the new design produced 6.41 kg/m2-day for wick on absorber plate system day during the hottest months in Famagusta (July-August 2010). Also tested was the influence of porous media (wire mesh), wick on the absorber plate. The effect of number of spray jets used in the system on the daily productivity and efficiency of the systems were also investigated.
4
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Dynamics of particle loading in deep-bed filter. Transport, deposition and reentrainment

85%
Przekop R., Gradoń L.
Chemical and Process Engineering
|
2016
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vol. 37
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issue 3
5
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Estimation of Filtration Efficiency – from Simple Correlations to Digital Fluid Dynamics

85%
Przekop R.
Chemical and Process Engineering
|
2017
|
vol. 38
|
issue 1
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