Method and apparatus for simultaneous determination of fluid mass flow rate, mean velocity and density
- 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 (United States)
- 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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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
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