Abstract
This paper describes a theoretical explanation of why the lower phase always goes to the tail end of a coil when the tail is placed at the periphery. This effect is due to the Archimedean and Hydrostatic influences working together to pump the lower phase towards the tail and the upper towards the head. A combination of the planetary motion, the geometry of the helical coil, and the movement of the Interface between the phases generate the pumping effect.
ACKNOWLEDGMENTS
We are grateful for the help of David Hawes and Justin Halls with using the Solver routine from Microsoft Excel, and the writing of macros for Excel.