Effects of the Grain Size on Dynamic Capillary Pressure and the Modified Green–Ampt Model for Infiltration

Figure 7

Wetting front suction head versus grain size. In all sands, from MGAM was larger than from GAM. The solid curve estimates from a static contact angle of 30°, the dotted line represents the best contact angle (63°) with from MGAM, and the dashed-dotted line represents the contact angle = 84° with from GAM.