Physical Sciences and Mathematics Commons^™

A Model For Stripping Multicomponent Vapor From Unsaturated Soil With Free And Trapped Residual Nonaqueous Phase Liquid, David Ostendorf, Chiu-On Ng, Chiang C. Mei

David Ostendorf

We present a model for the multicomponent vapor transport due to air venting in an unsaturated zone in the presence of free and trapped phases of residual nonaqueous phase liquid (NAPL). On the microscale the soil particles are assumed to form spherical aggregates with micropores filled with immobile water, trapped phases of NAPL and air. The interaggregate space is occupied with mobile air, and a thin film of free NAPL adheres on the aggregate surface. While the free NAPL can readily be in equilibrium with macropore vapor, the mass transfer from immobile phases in aggregates is rate-limited by aqueous diffusion. …