Soil & Water Res., 2008, 3(10):S52-S57 | DOI: 10.17221/1201-SWR

Wetting angle and water sorptivity in mineral soils

Henryk Czachor1, Maria Flis-Bujak2, Marcin Kafarski1, Andrzej Król1
1 Deptartment of Microstructure and Mechanics of Biomaterials, Institute of Agrophysics Polish Academy of Sciences in Lublin, Lublin, Poland
2 Soil Science Department, Agriculture Academy in Lublin, Lublin, Poland

Two simple models of a non-cylindrical (wavy) capillary have been applied to show the impact of pore shape and of wetting angle on water sorptivity in soils. Wetting angle derived from the Washburn approach gives an overestimated value because of pores are modelled as round capillary tubes, whereas in reality they are tortuous, wavy and interconnected. In wavy capillaries, the impact of wetting angle on water sorptivity and capillarity driven water transport can be much more pronounced in relation to Washburn approach. An observed wetting front movement can be seen as a superposition of micro jumps and rests. Experiments carried out with glass powder and two soils confirm the above predictions.

Keywords: sub-critical repellency; Washburn theory; wavy capillary

Published: December 31, 2008  Show citation

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Czachor H, Flis-Bujak M, Kafarski M, Król A. Wetting angle and water sorptivity in mineral soils. Soil & Water Res. 2008;3(Special Issue 1):S52-57. doi: 10.17221/1201-SWR.
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