利用截留数定量表征流速变化时DANPL驱替运移行为

SEAR(Surfactant-enhanced aquifer remediation)技术被用于修复DANPL,其修复机制分为增溶作用和驱替作用,其中驱替作用对于DNAPL的修复更为有效.多孔介质中DNAPL的驱替运移过程中,定量评价DNAPL的修复行为极为重要.本文利用多相流数值模型UTCHEM探究了流速对DNAPL驱替运移行为的影响.通过截留数定量评价流速变化时DNAPL的驱替行为,结果表明流速变化时,截留数能较准确描述驱替运移行为及流速变化时DNAPL的驱替效率.以截留数的两个分量毛管数和邦德数的比值定义的角度τ能够较准确预测不同流速条件下驱替作用过程中残留DNAPL的运移路径.

The quantitative prediction of DNAPL mobilization under different flow velocity using total trapping number

Surfactant-enhanced aquifer remediation (SEAR) is applicable to the remediation of DANPL, and the remediation mechanism is solubilization and mobilization, the latter of which is more efficient. During the mobilization process, quantitative evaluation of DNAPL recovery behavior in porous media is very important. In this paper, UTCHEM, which is a multiphase numerical model, was used to explore the influence of flow velocity on DNAPL mobilization behavior. The total trapping number was used for evaluating the influence of flow velocity quantitatively. Results show that the total trapping number could describe the process of surfactant flood and the efficiency of the DNAPL recovery with relative accuracy as the flow velocity changed. The angle, which was defined as the ratio of bond number and capillary number (the two components of the total number), could be used to estimate the path of residual DNAPL''s mobilization behavior with relative accuracy under the condition of different flow velocity.