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