Effect of Measurement Cross Section on Flow Rate Characteristics in Ultrasonic Flowmeters

DOI Web Site Web Site 3 Citations 11 References
  • ISHIKAWA Hiroaki
    Mechanical Metrology Dep., National Research Laboratory of Metrology KAIJO Corporation University of Tsukuba, Doctoral Program in Engineering
  • TAKAMOTO Masaki
    Mechanical Metrology Dep., National Research Laboratory of Metrology
  • SHIMIZU Kazuyoshi
    KAIJO Corporation
  • MONJI Hideaki
    University of Tsukuba, Institute of Engineering Mechanics and Systems
  • MATSUI Goichi
    University of Tsukuba, Institute of Engineering Mechanics and Systems

Bibliographic Information

Other Title
  • 超音波流量計の測定部形状と流量特性
  • チョウオンパ リュウリョウケイ ノ ソクテイブ ケイジョウ ト リュウリョウ トクセイ

Search this article

Abstract

In this study, the flow rate characteristics of ultrasonic flowmeters with variously shaped measurement sections or ducts and the flow characteristics in each measurement section were investigated experimentally and numerically. Also, the feasibility of flow rate measurements over a wide range, including the flow transition region, was investigated.<br>The experimental results reveal that the flow rate characteristics of the flowmeter were almost constant in regions of both laminar and turbulent flows in the case of a narrow rectangular duct connecting to a straight duct in the upstream side. Furthermore, the difference between the above case and the case of a narrow rectangular duct connecting to a bend in the upstream side was less than 1% in kh or the flow characteristics. Therefore, these results suggest that a narrow rectangular duct is highly suitable for an ultrasonic flowmeter.<br>The results of numerical simulation by an ultrasonic plane source verified that the flow rate characteristics of the ultrasonic flowmeter with a narrow rectangular duct were not influenced by the change in the velocity profile. That is, the flow rate characteristics of the ultrasonic flowmeter with a narrow rectangular duct were explained from the physical point of view not by an ultrasonic point source which considers the ultrasonic path between sensors to be as a single path or a line but by an ultrasonic plane source which considers the ultrasonic path to be as multipaths or a plane.<br>The linearity was within ±1.5% over a wide range of measurements. Thus, it is feasible that an ultrasonic flowmeter with a narrow rectangular measurement section can be put to practical use with such a high degree of accuracy.

Journal

Citations (3)*help

See more

References(11)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top