The effect of concentration‐dependent surface tension on the flaw of water and transport of dissolved organic compounds: A pressure head‐based formulation and numerical model

Unsaturated flow and solute transport models in isothermal porous media generally assume surface tension at the air‐water interface to be constant. Yet many organic compounds, including a number of environmental interest, reduce surface tension in proportion to their aqueous phase concentrations. An isothermal saturated‐unsaturated flow and transport model has been developed that incorporates variable surface tension caused by varying solute …