Department of Civil and Environmental Engineering, Seoul National University, Republic of Korea.
J Contam Hydrol. 2013 Apr;147:82-95. doi: 10.1016/j.jconhyd.2013.02.008. Epub 2013 Feb 24.
Mass transfer limitations impact the effectiveness of soil vapor extraction (SVE) and cause tailing. In order to identify the governing mass transfer processes, a three-dimensional SVE numerical model was developed. The developed model was based on Comsol Multiphysics a finite element method that incorporates multi-phase flow, multi-component transport and non-equilibrium transient mass transfer. Model calibration was done against experimental data from previously completed lab-scale reactor experiments. The developed model, 3D-SVE, nicely simulates laboratory findings and allows for changes in the important governing mass transfer relationships. The modeling results showed that a single averaged mass transfer value is a poor representation of the entire SVE operation, and that a transient mass transfer coefficient is required to fully represent SVE tailing. Calibration of the lab scale model showed that the most important mass transfer occurs between the NAPL and vapor phase.
传质限制会影响土壤蒸气抽提 (SVE) 的效果，并导致拖尾。为了确定控制传质过程，开发了一个三维 SVE 数值模型。所开发的模型基于 Comsol Multiphysics，它是一种有限元方法，结合了多相流、多组分传输和非平衡瞬态传质。模型校准是针对以前完成的实验室规模反应器实验的实验数据进行的。开发的 3D-SVE 模型很好地模拟了实验室的发现，并允许改变重要的控制传质关系。建模结果表明，单一平均传质值是 SVE 整个操作的一个较差表示，需要瞬态传质系数来完全表示 SVE 拖尾。实验室规模模型的校准表明，最重要的传质发生在 NAPL 和蒸气相之间。
