| 摘要 |
<p>The process cannot be used for blood and liquids containing human cells. A flow of the fluid is submitted to a transverse force in the direction of flow to settle the higher density phase or the particles. One of the phases is removed continuously as fast as it forms over at least part of the length of the flow The flow is as laminar as possible. The flow can be over a circular trajectory to apply a centrifugal force and remove the denser phase on the outside or the lighter phase from the inside at a number of points. The length of the wall along which the flow passes is dimensioned to allow removal of almost all of the required phase. Alternatively the lighter phase can be removed from inside over one zone of the flow and then the denser phase removed from the outside downstream of the previous zone. The flow forms a cyclone with the lighter phase flowing concentrically about the axis of rotation. A tubular porous wall is placed inside the annular flow of the denser phase and a vacuum is created inside it to suck the lighter phase in over all its surface. Alternatively, the fluid flow is at a pressure above atmospheric and a number of openings are spread over the upper wall of an inclined channel to allow the lighter phase of the liquid to leave the channel as fast as it the denser liquid settles. A liquid to be separated is tipped into a decanting tank whose base has means of collecting and evacuating the denser phase of liquid, with a drainage device at the surface to remove the lighter liquid as fast as it separates.</p> |
