The Biased Laminar By-Pass Fluidic Flowmeter

[+] Author and Article Information
Geoffrey H. Priestman

Department of Chemical and Process Engineering,  University of Sheffield, Mappin Street, Sheffield, S1 3JD, Englandg.priestman@shef.ac.uk

Robert F. Boucher

Office of Vice Chancellor,  University of Sheffield, Mappin Street, Sheffield, S1 3JD, England

J. Fluids Eng 127(6), 1199-1204 (Jul 07, 2005) (6 pages) doi:10.1115/1.2060729 History: Received October 05, 2004; Revised July 07, 2005

This paper demonstrates that the range of a fluidic flow meter can be significantly extended by connecting it in parallel with a fixed laminar by-pass resistance. Analysis shows how for any particular specification, there is an optimum combination of meter and by-pass which maximizes the flow range. Validation tests were done in air, using a fluidic target meter integrated into a housing with a laminar by-pass of parallel rectangular cross section passages formed between flat plates. Results obtained showed excellent agreement with analytical predictions, almost doubling the operating range for the typical specification chosen, a major advance in the context of the previous research aimed at extending meter range. In principle the concept should be applicable to any flowmeter having a suitable Eulerian pressure-flow characteristic.

Copyright © 2005 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

Concept of by-pass resistance applied to fluidic flowmeter

Grahic Jump Location
Figure 2

Flow division for meter and laminar resistance in parallel

Grahic Jump Location
Figure 3

Change of minimum flow, range and laminar tube diameter with nozzle size, Qmax=6m3∕h

Grahic Jump Location
Figure 4

Plan design of fluidic target meter

Grahic Jump Location
Figure 5

Target meter operating characteristics, d=1.4mm, n=7

Grahic Jump Location
Figure 6

Nondimensionalized operating characteristics of target meter alone, d=1.4mm, n=7

Grahic Jump Location
Figure 7

Combined meter operating characteristics, N=10

Grahic Jump Location
Figure 8

Combined meter operating characteristics, N=17

Grahic Jump Location
Figure 9

Variation of frequency∕flowrate with flowrate for the meter operating with 10 and 17 by-pass passages

Grahic Jump Location
Figure 10

Comparison of measured and theoretical laminar by-pass resistance

Grahic Jump Location
Figure 11

Comparison of test data with predicted performance for meter with 10 laminar by-pass passages, Qmax=4.53m3∕h

Grahic Jump Location
Figure 12

Comparison of test data with predicted performance for meters with various number of laminar by-pass passages, d=1.4mm




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In