Experimental Investigation of the Effective Foam Viscosity in Unsaturated Porous Media

Journal Article · Thu Nov 01 04:00:00 EDT 2012 · Vadose Zone Journal, 11(4)

DOI:https://doi.org/10.2136/vzj2011.0190· OSTI ID:1060662

Zhang, Z F; Zhong, Lirong; White, Mark D; Szecsody, James E

Foam has the potential to effectively carry and distribute either aqueous or gaseous amendments to the deep vadose zone for contaminant remediation. However, the transport of foam in porous media is complicated because flow characteristics such as the effective viscosity are affected not only by foam properties but also by the sediment properties and flow conditions. We determined the average effective foam viscosity via a series of laboratory experiments and found that the effective foam viscosity increased with the liquid fraction in foam, the injection rate, and sediment permeability. These impacts are quantified with an empirical expression, which is further demonstrated with data from literature. The results show that the liquid fraction in foam and sediment permeability are two primary factors affecting effective foam viscosity. These results suggest that, when foam is used in deep vadose zone remediation, foam flow will not suffer from gravitational drainage and can distribute amendments uniformly in heterogeneous sediments.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1060662
• Report Number(s): PNNL-SA-87925; EY4049110
• Journal Information: Vadose Zone Journal, 11(4), Journal Name: Vadose Zone Journal, 11(4)
• Country of Publication: United States
• Language: English

Related Subjects

Deep Vadoze Zone
Remediation