skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Method and apparatus for simultaneous determination of fluid mass flow rate, mean velocity and density

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 change in power input. The invention provides stable, rapid, and accurate measurements. It does not require bending of the fluid flow.

Inventors:
 [1]
  1. Farragut, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
865150
Patent Number(s):
4470294
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; simultaneous; determination; fluid; mass; flow; rate; mean; velocity; density; relates; determining; flowrate; aspect; passed; straight; cantilevered; tube; transient; oscillation; induced; generating; coriolis; damping; forces; decay; frequency; resulting; damped; measured; determined; therefrom; electrically; powered; device; imparts; steady-state; harmonic; excitation; generates; tube-damping; dependent; means; provided; respond; incipient; flow-induced; changes; amplitude; vibration; changing; power; input; required; sustain; original; change; provides; stable; rapid; accurate; measurements; require; bending; accurate measurements; electrically powered; power input; mass flow; flow rate; fluid flow; accurate measurement; fluid mass; decay rate; accurate measure; rate measurements; /73/

Citation Formats

Hamel, William R. Method and apparatus for simultaneous determination of fluid mass flow rate, mean velocity and density. United States: N. p., 1984. Web.
Hamel, William R. Method and apparatus for simultaneous determination of fluid mass flow rate, mean velocity and density. United States.
Hamel, William R. Sun . "Method and apparatus for simultaneous determination of fluid mass flow rate, mean velocity and density". United States. https://www.osti.gov/servlets/purl/865150.
@article{osti_865150,
title = {Method and apparatus for simultaneous determination of fluid mass flow rate, mean velocity and density},
author = {Hamel, William 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 change in power input. The invention provides stable, rapid, and accurate measurements. It does not require bending of the fluid flow.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

Patent:

Save / Share: