Method and device for the dynamic and density-independent determination of mass flow

US4448081A · kind A · utility

Assignee

• Battelle Institute e.V. · DE

Inventors

• Jorg Kolitsch · Munich, DE
• Norbert Sparwell · Troisdorf, DE
• Eugen Brockmann · Bad Soden am Taunus, DE

Key dates

• Filing date: Aug 21, 1981
• Grant date: May 15, 1984
• Expiry date: Aug 21, 2001

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/86
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Method for the dynamic and density-independent determination of the mass flow of fluids. A single vortex generating bluff body is placed in the flow to generate vortices according to the principle of the Karman vortex path. The dynamic pressure (1/2.rho.v.sup.2) is determined via the effect of the drag directly at this bluff body. The velocity of flow (v) is determined via the effect of the vortex shedding at the bluff body. The mass flow is determined according to the equation: EQU m=2.multidot.(1/2.rho.v.sup.2).multidot.1/2.multidot.A wherein A is the cross section of the flow channel. Device for implementing such method. The device consists essentially of a vortex-generating bluff body having one or two fixed ends, which itself serves as a transducer or at which one or two transducers are provided. An electronic system for processing the resultant signal is available.