Representative elementary volume analysis of porous media using X-ray computed tomography

Al-Raoush, R. and Papadopoulos, A. (2010) Representative elementary volume analysis of porous media using X-ray computed tomography. Powder Technology, 200 (1-2). pp. 69-77. ISSN 0032-5910

Full text not available from this repository.

Item Type:Article
Item Status:Live Archive

Abstract

The concept of representative elementary volume (REV) is critical to understand and predict the behaviour of effective parameters of complex heterogeneous media (e.g., soils) in a multiscale manner. Porosity is commonly used to define the REV of a given sample. In this paper we investigated whether the use of a REV for porosity can be used as a REV for other parameters such as particle size distribution, local void ratio and coordination number. X-ray computed tomography was used to obtain 3D images (i.e., volumes) of natural sand systems with different particle size distributions. 3D volumes of four different systems were obtained and a REV analysis was performed for these parameters utilizing robust 3D algorithms.Findings revealed that the REVmin for porosity may not be adequate to be considered as a REV for parameters such as particle size distribution, local void ratio and coordination number. The REVmin for these parameters was observed to be larger than the REVmin for porosity. Heterogeneity of the systems was found to be an important factor to determine the REV for the parameters analyzed in this paper. The REV analysis revealed that as the uniformity coefficient increased, a larger volume was required to obtain the REVmin for the distribution of particle sizes and coordination number whereas a smaller volume was required to obtain the REVmin for local void ratio. Therefore, determination of the REV for parameters described in this paper or any microscale parameter of concern should not be derived based on REV for porosity and should be determined based on their distributions over different volumes. © 2010 Elsevier B.V.

Keywords:Computed Tomography, Coordination number, Local void ratio, Micro-scale particles, Representative elementary volume, Computerized tomography, Coordination reactions, Particle size, Porosity, Porous materials, Scanning, Size distribution, Structural analysis, Three dimensional, algorithm, analytical parameters, article, computer assisted tomography, constants and coefficients, controlled study, elementary particle, image processing, image reconstruction, imaging system, mathematical computing, probability, three dimensional imaging, X ray analysis
Subjects:F Physical Sciences > F870 Soil Science
D Veterinary Sciences, Agriculture and related subjects > D750 Soil as an Agricultural medium
Divisions:College of Science > National Centre for Food Manufacturing
Related URLs:
ID Code:27891
Deposited On:25 Aug 2017 11:39

Repository Staff Only: item control page