Density-driven flow of gas in the unsaturated zone due to the evaporation of volatile organic compounds
Density-driven flow of gas in the unsaturated zone due to the evaporation of volatile organic compounds
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DOI：
10.1029/wr025i010p02159
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发表时间：
1989-10
影响因子：
5.4
通讯作者：
R. Falta;I. Javandel;K. Pruess;P. Witherspoon
中科院分区：
文献类型：
--
作者：
R. Falta;I. Javandel;K. Pruess;P. Witherspoon
对影响不饱和区蒸发有机液体气相传输的因素进行了理论研究。使用简单的解析表达式对密度驱动的平流气流的估计表明，具有高渗透性的土壤中挥发性液体的蒸发将导致显着的平流气流。使用二维圆柱几何形状并包括固相、气相、水相和有机液相之间的相分配效应的数值模拟表明，密度驱动流引起的传质可能主导不饱和区中某些有机化学蒸气的气相传递。
A theoretical investigation of factors affecting the gas phase transport of evaporating organic liquids in the unsaturated zone is presented. Estimates of density-driven advective gas flow using a simple analytic expression indicate that significant advective gas flow will result from the evaporation of volatile liquids in soils having a high permeability. Numerical simulations using a two-dimensional cylindrical geometry and including the effects of phase partitioning between the solid, gas, water, and organic liquid phases show that mass transfer due to density-driven flow may dominate the gas phase transport of some organic chemical vapors in the unsaturated zone.