44results about How to "Good flow control" patented technology

The invention belongs to the field of oilfield chemistry, and particularly relates to a zirconium dispersoid gel complex oil displacing system. The zirconium dispersoid gel complex oil displacing system includes a multi-scale zirconium dispersoid gel, a polyether type nonionic surfactant and preparation water, wherein the mass fraction of the multi-scale zirconium dispersoid gel is 0.16%-0.24% of the total mass of the complex oil displacing system; the polyether type nonionic surfactant is 0.1%-0.4% of the total mass of the complex oil displacing system; the balance is water, and the total mass fraction of all components is 100%. According to the invention, the multi-scale zirconium dispersoid gel and the polyether type nonionic surfactant have excellent synergistic effect, and the oil-water interfacial tension can be reduced to the order of magnitudes of 10<-3> mN / m, so that the displacement efficiency of an oil-displacing agent is remarkably improved, adverse effect caused by weakened viscosity of polymers in a binary combination flooding or a ternary combination flooding is avoided, and adverse effect caused by alkali is avoided, and the oil displacing effect of the complex oil displacing system is improved.

An aseptic diaphragm valve in which a valve seat (37) is formed by a groove including a concave surface of engagement that positioned along an outer diameter of an upper end of an inlet tube (32), and a resilient valve member portion (41) that is annular in extent with a convex surface that moves into the groove to contact the concave surface (37) around the outer diameter of the inlet tube (32) to close the valve. The valve member portion (41) has at least a coating of polytetrafluoroethylene (47) or equivalent material.

A coke oven piping system (10) comprises a pipe assembly for conveying coke oven gases (14) from a coke oven to a collecting main (16); and flow control means comprising a flow orifice (22) in the pipe assembly with an associated obturating member (20), the obturating member being axially moveable between an open position at a certain distance from the flow orifice to a closed position in which it substantially obstructs the flow orifice (22). At least one throttling opening (28) is arranged so as to offer, towards the end of the closing stroke of the obturating member (20), an opening area for the gases to the collecting main (16) that depends on the axial position of the obturating member (20).

The invention belongs to the technical field of aerodynamics, and discloses an active vortex generator based on electromagnetic excitation. The active vortex generator based on electromagnetic excitation comprises a vibrating reed, a frame structure, a permanent magnet and an electromagnetic exciter, wherein the vibrating reed, the frame structure, the permanent magnet and the electromagnetic exciter are sequentially arranged in a wing of an aircraft or a leading-edge cavity of the aircraft from top to bottom. When the active vortex generator is arranged in the wing of the aircraft, a groove structure which is matched with the vibrating reed in cross-section shape is arranged on the skin of the aircraft, the vibrating reed is embedded into the groove structure, and when the vibrating reed is buried inside the skin of the aircraft, the upper surface of the vibrating reed and the horizontal plane of the skin of the aircraft are kept consistent. According to the active vortex generator based on electromagnetic excitation, active adjustment of flow control is achieved, the parasitic drag and adverse influence of the active vortex generator under the off-design working conditions are reduced, and the purposes of optimal drag reduction and optimal noise reduction are achieved.