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Title: Method and apparatus for determining fluid mass flowrates

Abstract

This invention relates to a new method and new apparatus for determining fluid mass flowrate and density. In one aspect of the invention, the fluid is passed through a straight cantilevered tube in which transient oscillation has been induced, thus generating Coriolis damping forces on the tube. The decay rate and frequency of the resulting damped oscillation are measured, and the fluid mass flowrate and density are determined therefrom. In another aspect of the invention, the fluid is passed through the cantilevered tube while an electrically powered device imparts steady-state harmonic excitation to the tube. This generates Coriolis tube-damping forces which are dependent on the mass flowrate of the fluid. Means are provided to respond to incipient flow-induced changes in the amplitude of vibration by changing the power input to the excitation device as required to sustain the original amplitude of vibration. The fluid mass flowrate and density are determined from the required bending of the fluid flow.

Inventors:
Issue Date:
OSTI Identifier:
5823468
Application Number:
ON: DE83018018
Assignee:
ERA-08-054774; EDB-83-179033
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; FLOWMETERS; DESIGN; CORIOLIS FORCE; DENSITY; FLOW RATE; OSCILLATIONS; TRANSIENTS; MEASURING INSTRUMENTS; METERS; PHYSICAL PROPERTIES; 440300* - Miscellaneous Instruments- (-1989)

Citation Formats

Hamel, W.R. Method and apparatus for determining fluid mass flowrates. United States: N. p., 1982. Web.
Hamel, W.R. Method and apparatus for determining fluid mass flowrates. United States.
Hamel, W.R. Thu . "Method and apparatus for determining fluid mass flowrates". United States.
@article{osti_5823468,
title = {Method and apparatus for determining fluid mass flowrates},
author = {Hamel, W.R.},
abstractNote = {This invention relates to a new method and new apparatus for determining fluid mass flowrate and density. In one aspect of the invention, the fluid is passed through a straight cantilevered tube in which transient oscillation has been induced, thus generating Coriolis damping forces on the tube. The decay rate and frequency of the resulting damped oscillation are measured, and the fluid mass flowrate and density are determined therefrom. In another aspect of the invention, the fluid is passed through the cantilevered tube while an electrically powered device imparts steady-state harmonic excitation to the tube. This generates Coriolis tube-damping forces which are dependent on the mass flowrate of the fluid. Means are provided to respond to incipient flow-induced changes in the amplitude of vibration by changing the power input to the excitation device as required to sustain the original amplitude of vibration. The fluid mass flowrate and density are determined from the required bending of the fluid flow.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {10}
}