Geometria fazy stalej i przestrzeni porow w rolniczych osrodkach granularnych na przykladzie gleby mineralnej

• Autorzy: Czachor H

Warianty tytułu

EN

Solid phase and pore space geometry of agriculture granular materials for example mineral soils

• Języki publikacji: PL

Abstrakty

EN

The physical properties of granular loose materials depend on their internal structure, which can he regarded as the geometry of solid particles in spacc. The purpose of thise paper is to find the method for solid phase reconstruction of the granular medium and then to describe a created structure of pores and solid particles. Packing simulation procedure has been elaborated lo find ihe geometry of a virtual solid grain body. The particle shape has been approximated by means of a sphere. The grain size distribution converted to the number proportions in the classes and the porosity of the investigated body are the input data. The representative volume and the disordered character of the virtual structure have been examined via 3D- and 2D porosities analysis. It was found that the packing procedure can create the structures of such grain size distributions where the ratio of left and right diameter limits is < 30. The above limitations follow from the software (Pascal) and hardware (486 and Pentium) used for the investigation. The concept of a single 2D- and 3D- pores has been proposed. The single 3D-pore is a part of spacc limited by 4 particle surfaces and 4 nceks., while 2D-one is determined by 3-cross-sectioned particles and 3 necks. Such tesselation allowed to divide the medium space (or area) on a set of tetrahedrons (or triangles) which fill this space coherently. Bach tetrahedron (triangle) contains one 3D- (or 2D-) pore. It was found that maximum contact number of the particle in monosize grain medium can be described by a square function where the argument is the ratio of the radii of both: the investigated and the monosize particlcs. The knowledge of the parameters and connectivity of the pores in the network allowed for the determination of the moisture retention curve for some sands and sandy loam body. Several approaches have been presented which differ from each other by dimension of the body (2D and 3D), mechanism of the pore drainage (independent of the slate of the neighbours or dependent on it), type of the formula for neck radius determination. The best correlations with the experiment data were found for 2D where the drying of the pore has been assumed to be independent of the state of the neighbour pores and when the lens water is taken into consideration. It was suggested that moisture retention is dependent on the geometry of sample used for the measurement. The comparison of the compatible 2D and 3D pore estimators distributions shows that they are not equal: the 2D- is wider than 3D, The stereological interpretation of the notieed differenecs explaining this relation was proposed. Key words: grain size distribution, packing simulation, grain mierostuclure, pore modeling, pore size distribution, stereology, moisture retention.

Słowa kluczowe

PL

geometria fazy stalej; geometria przestrzeni porow; osrodki porowate; pory osrodka; sklad granulometryczny; analiza granulometryczna; mikrostruktura; faza stala; gleby mineralne

EN

pore space geometry; porous medium; pore; granulometric composition; granulometric analysis; microstructure; solid phase; mineral soil

• Wydawca: -
• Czasopismo: Acta Agrophysica
• Rocznik: 1997
• Tom: 07
• Opis fizyczny: ss.80,tab.,rys.,bibliogr.

Twórcy

autor

Czachor H

Bibliografia

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