Daily Question 2015.10.1 (EIA Discussion): 3 Wealth points for replies, plus 5 Wealth points for correct answers (single-choice question)

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This post was last edited by Zhang Xiaopeng on 2015-10-1 08:44. Regarding the relationship between the permeability coefficient K and the particle size d of a medium, which of the following statements is correct? A. The larger d is, the greater K is. B. The smaller d is, the greater K is. C. K has no relation to d and is related to the viscosity of the liquid. D. K is related to d but has no relation to the viscosity of the liquid. Correct answer: A. Explanation: The permeability coefficient is an important parameter that indicates the water-permeability of a porous medium. Its value depends on the properties of the medium, such as the composition of the particles and their arrangement. The larger the particle size, the greater the value of the permeability coefficient； On the other hand, it is also related to the physical properties of the fluid (such as its viscosity). In practical applications, since the viscosity of groundwater varies little across different regions, when studying the patterns of groundwater flow, the viscosity of groundwater can often be ignored; that is, it is assumed that the permeability coefficient depends only on the properties of the aquifer material, which simplifies the problem.