Abstract: Disclosed is a port system for facilitating mixed solid/liquid content discharge from a portable tank especially vacuum tank trailer, discharge system. The system provides an enlarged sloped tank outlet system that overcomes the deficiencies of convention systems.

Abstract: Disclosed is a port system for facilitating mixed solid/liquid content discharge from a portable tank especially vacuum tank trailer, discharge system. The system provides an enlarged sloped tank outlet system that overcomes the deficiencies of convention systems.

Abstract: The invention provides a system and method for turbulent flow drag reduction using discrete counter-rotating elements disposed adjacent a bounding surface and arranged to effectively disrupt or suppress stream-wise vortices and/or traveling waves thereby reducing turbulence and increasing fluid flow. In embodiments, the counter-rotating elements effectively decouple the interaction between traveling waves and stream-wise vortices. By using discrete counter-rotating elements as disclosed, the energy input to the counter-rotating elements is advantageously less than the energy gained from the flow rate increase. The counter-rotating elements may comprise e.g., counter-rotating strips, counter-rotating disks or a plurality of sequentially activated jets. In addition, the bounding surface may comprise a section or pipe, a substantially planar surface, etc. The counter-rotating elements may be used along a section of a pipe, on a surface of an aircraft wing, in HVAC systems, etc.