Abstract
In this paper, we investigate experimentally and numerically the dynamics of the drainage of a transparent capillary tube (radius 0.4 mm). A non-wetting fluid (gas) displaces a wetting fluid (oil). The gas phase is continuously injected at an extremity of the capillary tube (inlet section) at a constant injection-rate Q(inj), ranging from 0.1 to 10 ml/h, corresponding to capillary numbers Ca varying between 5 . 10(-4) and 5 . 10(-2). Oil phase, initially filling the tube, leaves the system at the second opened extremity (outlet section).We consider in this work the compressibility of non-wetting fluid (gas), viscous forces in the liquid column, capillary forces and gravity. The effect of several parameters, such as Q(inj j) and gravity, on the progress of the gas-liquid interface has been investigated.