Fig. 11From: An experimental study on the rate and mechanism of capillary rise in sandstoneConceptual models of capillary rise after the water expulsion treatment with different ΔP in Eq. 7. a Only the pores with a radius of r narrow2 are initially water-filled. (b) The pores with radii of r narrrow1 and r narrow2 become water-filled. Water advances depending on whether the narrower pore is filled with water (case a or b in Fig. 10)Back to article page