Multiphase fluid flow and heat transfer at Hanford single-shell tanks: a progress report on modeling studies

摘要

Numerical simulation studies have been performed to obtain a better understanding of fluid flow and heat transfer in the unique hydrogeologic system created by the Hanford tanks. The preliminary model presented here emphasizes an understanding of processes rather than a representation of site-specific detail. Our simulation considers moisture migration under nonisothermal, multiphase conditions. It includes phase change (vaporization-condensation) and gas phase flow effects, but no allowance has yet been made for dissolved solids and chemical interactions, as would be required to describe fluids leaked from tanks. Problem parameters are loosely patterned after conditions at tank SX-108. Our simulations indicate that vapor diffusion is an important moisture transport mechanism that promotes formation dry-out beneath the tanks.