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Experimental Study of Dispersion Coefficient and Scale Effect in Single Horizontal Fracture

Author: HuaFang
Tutor: QianJiaZhong
School: Hefei University of Technology
Course: Environmental Science
Keywords: Single fracture non - Darcy flow Diffusion coefficient Scale effect Peclet number
CLC: X52
Type: Master's thesis
Year: 2010
Downloads: 123
Quote: 0
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Abstract


Numerical Simulation of groundwater flow and contaminant transport in the fracture-karst media has become the water environmental management and protection is a very important field . At home and abroad for the study of the problem of the flow and solute transport in porous media has become more sophisticated, but for the fractured media research remains to be further improved , in particular, needs to be further study of the migration and transformation of contaminants in fractured media . In this paper, based on the summary of the relevant research results at home and abroad , designed parallel plate single fracture model and carried out a systematic flow and solute transport test , the test results were analyzed , the main conclusions are as follows : (1) the slow seepage area ( i.e. , the front-line flow region ) , the permeation coefficient decreases with increasing gap width ; fitting ( 2) the slow seepage under phase flow velocity and hydraulic gradient , the result was a non - Darcy (non- The Darcy ) relationship , fitting the resulting coefficient n value between 1 and 2 . Zhi-Fang Zhou given the high-speed non - Darcy flow state nonlinear index changes in the range of 1.0 to 2.0 is consistent . Visible regardless of low-speed or high-speed non - Darcy flow, the nonlinear index range is basically the same . ( 3 ) the level of a single fracture Peclet number ( Pe ) and the dispersion coefficient and molecular diffusion coefficient between the ratio of DL / DF between showing the following rules , namely : DL Df = b apem statistics derived from the value of m referral between 1.0 to 2.0 m range of values ??derived in the porous medium is slightly larger than the Bear ( 1972 ) . This is in the same circumstances , the diffusion coefficient of the porous medium is typically far less than the fissure , resulting in a DL / DF becomes relatively large and the number of Pe is relatively reduced , resulting in changes in the amplitude of the DL / DF with the Pe number increase , m values ??is relatively increased . (4) In the slow seepage stage , the fractal dimension of the scale effect of the diffusion coefficient with the increase of the flow rate decreases, the diffusion coefficient decreases with the increase of the gap width . (5 ) Darcy flow stage , the degree of dispersion decreases with increasing permeability coefficient .

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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