Super Accelerated Flow in Diverging Conical Pipes
The motion of the upper free surface of a liquid column released from rest in a vertical, conical container is analyzed theoretically and experimentally. An inviscid, one-dimensional model, for a slightly expanding pipe's radius, describes how the recently reported super free fall of liquids occurs in liquids of very low viscosity. Experiments agree with the theoretical results.
G.J. Gutierrez et al., "Super Accelerated Flow in Diverging Conical Pipes", Applied Mechanics and Materials, Vols. 110-116, pp. 880-885, 2012