Abstract
Wicking of liquid under externally applied liquid pressure into three paper wipes is studied for the first time. Darcy's law and capillary-tube flow form the basis of two separate theoretical models which were tested through experiments. The wicking and wetting parameters of the tested wipes were measured independently to enable such a comparison without the use of any fitting parameters. Darcy model is found to work better under zero hydraulic pressure, i.e. pure wicking; however capillary model is more accurate when the incoming liquid is pressurized. An increase in the applied pressure led to an increase in the liquid absorption rate and a decrease in the saturation time. However, its relative effect on the absorption rate and saturation time was found to decrease with an increase in its magnitude.
