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몬테카를로 모사에 의한 다공질 매체의 사은 세공측정법 분석

Analysis of Mercury Porosimetry for Porous Media by Monte Carlo Simulation

HWAHAK KONGHAK, February 1993, 31(1), 16-27(12), NONE
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Abstract

몬테카를로 모사법을 이용하여 다공질 매체의 세공크기분포 측정에 이용되는 수은 세공측정법의 신뢰도를 조사하였다. 세공의 격자구조를 변화시키면서 동시에 정확하게 세공의 크기분포를 알 수 있는 가상적인 다공질 매체를 검퓨터상에 설정하여 수은의 침투-후퇴현상을 모사실험하였다. 모사된 다공질 메체들은 2차원 정사각형 및 정삼각형 격자형태를 갖고 있으며, 구형의 세공들이 격자의 교차점에 위치하고 이들을 원통형의 세공들이 연결 배위된 구조를 갖고 있다. 세공의 크기분포는 정규, 이형 그리고 비대칭분포에 대하여 검토되었다. 모사결과, 수은 세공측정법은 세공의 격자형태에 상관없이 대상 다공질 매체의 평균 세공크기는 정확히 측정할 수 있으나, 측정된 평균 세공크기의 분율은 실제 분율보다 높게 측정됨을 알 수 있었다. 또한, 평균 세공크기보다 작은 세공의 분포는 비교적 정확히 측정할 수 있으나, 평균 세공크기보다 큰 세공의 분포는 실제분포보다 낮은 분율로 측정되는 결과는 얻었다.
By performing Monte Carlo simulation, a reliability of mercury porosimetry, which is widely used for determining the distribution of pore sizes of porous media is investigated. The hypothetical porous media in which the exact distribution of pore sizes for differently given the pore lattice structures are known is constructed on the computer and subsequently the mercury penetration-retraction simulatiion studies are carried out. The tested types of porous media have 2-D square or hexagonal-triangular lettice structures, respectively, and they have the pore structure as the sphercal pores are located in each lattice sites and these pores are bonded by the cylindrical capillary pores according to the given lattice type. Also, the tested media have one of the distributions of pore sizes such as the normal, bimodal and skewed types. As the results, we found that the average pore sizes for such media can be measured accurately by the method of mercury porosimetry. However, the fraction of average distrubutions of pores measured by the method of mercury porosimetry. However, the fracton of average distrubutions of pores measured by the method tends to show higher values than those of the actual fraction. Also, the results show that the actual size of pore size smaller than the average pore sizes can be accurately measured, however, the distributon or pores larger than the average pore size is measured as it has lower rfaction than those of actual fraction of the distribution.

Keywords

References

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