| 초록 |
Capillary action occurs because of intermolecular forces in narrow spaces between the liquid and surrounding solid surfaces. Therefore, we try to investigate the flow behavior of complex fluids in porous media based on capillary flow in this study. When the capillary rise occurs, shear rate is changing as the rise velocity decreased. Therefore, we used two kinds of fluid types. First, for each fluid's rheological property, a formula that can describe the overall profile of the capillary rise from the force balance was derived. We also derived a formula to describe the capillary rise profile when gravity is ignored and the role of capillary pressure is dominant from the Poiseuille's flow. And we compared the results of capillary rise experiment with two derived equations. As a result, the capillary pressure dominant region in the capillary rise experiment is very short and the gravity action becomes important. Moreover, when we compare experimental data with equation which describe the entire regime of capillary rise, both were fitted well each other. |
