Discussions on accuracy of modified KDP method applied to simultaneous measurements of unsteady flow rates, pressures and impedances for pulsating oil flows in a pipe

Huiqing Chen, Seiichi Washio, Satoshi Takahashi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

When a liquid flow in a pipe is accelerated or decelerated, a differential pressure is kinetically induced between two separate sections of the liquid column. This fact has been utilized to measure an unsteady flow rate, and that way of measurement is called "Kinetic Differential Pressure (KDP) Method". In the present paper, the KDP method is modified so as to find oscillatory flow rates, pressures and hydraulic impedances simultaneously at any section in pulsating pipe flows of oil from the pressure data detected at two fixed sections of the pipe. Through being applied to measurements of impedances of a pipe with a closed end and a Helmholtz resonator, the modified KDP method has proved effective enough for pratical use. In actual measurements, it turned out more recommendable from the viewpoint of accuracy to employ differential pressures obtained by electrical subtraction between outputs of the two pressure transducers than to rely upon pressure data alone.

Original languageEnglish
Pages (from-to)2934-2940
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume71
Issue number712
Publication statusPublished - Dec 2005
Externally publishedYes

Fingerprint

differential pressure
unsteady flow
Unsteady flow
flow velocity
oils
Pipe
Flow rate
impedance
Kinetics
kinetics
Helmholtz resonators
pipe flow
liquid flow
pressure sensors
subtraction
hydraulics
Oils
Pressure transducers
Pipe flow
Liquids

Keywords

  • Differential Pressure
  • Flow Rate
  • Impedance
  • Measurement
  • Oil Hydraulics
  • Pulsating Flow

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "When a liquid flow in a pipe is accelerated or decelerated, a differential pressure is kinetically induced between two separate sections of the liquid column. This fact has been utilized to measure an unsteady flow rate, and that way of measurement is called {"}Kinetic Differential Pressure (KDP) Method{"}. In the present paper, the KDP method is modified so as to find oscillatory flow rates, pressures and hydraulic impedances simultaneously at any section in pulsating pipe flows of oil from the pressure data detected at two fixed sections of the pipe. Through being applied to measurements of impedances of a pipe with a closed end and a Helmholtz resonator, the modified KDP method has proved effective enough for pratical use. In actual measurements, it turned out more recommendable from the viewpoint of accuracy to employ differential pressures obtained by electrical subtraction between outputs of the two pressure transducers than to rely upon pressure data alone.",
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T1 - Discussions on accuracy of modified KDP method applied to simultaneous measurements of unsteady flow rates, pressures and impedances for pulsating oil flows in a pipe

AU - Chen, Huiqing

AU - Washio, Seiichi

AU - Takahashi, Satoshi

PY - 2005/12

Y1 - 2005/12

N2 - When a liquid flow in a pipe is accelerated or decelerated, a differential pressure is kinetically induced between two separate sections of the liquid column. This fact has been utilized to measure an unsteady flow rate, and that way of measurement is called "Kinetic Differential Pressure (KDP) Method". In the present paper, the KDP method is modified so as to find oscillatory flow rates, pressures and hydraulic impedances simultaneously at any section in pulsating pipe flows of oil from the pressure data detected at two fixed sections of the pipe. Through being applied to measurements of impedances of a pipe with a closed end and a Helmholtz resonator, the modified KDP method has proved effective enough for pratical use. In actual measurements, it turned out more recommendable from the viewpoint of accuracy to employ differential pressures obtained by electrical subtraction between outputs of the two pressure transducers than to rely upon pressure data alone.

AB - When a liquid flow in a pipe is accelerated or decelerated, a differential pressure is kinetically induced between two separate sections of the liquid column. This fact has been utilized to measure an unsteady flow rate, and that way of measurement is called "Kinetic Differential Pressure (KDP) Method". In the present paper, the KDP method is modified so as to find oscillatory flow rates, pressures and hydraulic impedances simultaneously at any section in pulsating pipe flows of oil from the pressure data detected at two fixed sections of the pipe. Through being applied to measurements of impedances of a pipe with a closed end and a Helmholtz resonator, the modified KDP method has proved effective enough for pratical use. In actual measurements, it turned out more recommendable from the viewpoint of accuracy to employ differential pressures obtained by electrical subtraction between outputs of the two pressure transducers than to rely upon pressure data alone.

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KW - Flow Rate

KW - Impedance

KW - Measurement

KW - Oil Hydraulics

KW - Pulsating Flow

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