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
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Figure 1

Concept of by-pass resistance applied to fluidic flowmeter

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Figure 2

Flow division for meter and laminar resistance in parallel

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Figure 3

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

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Figure 4

Plan design of fluidic target meter

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Figure 5

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

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Figure 6

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

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Figure 7

Combined meter operating characteristics, N=10

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Figure 8

Combined meter operating characteristics, N=17

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Figure 9

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

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Figure 10

Comparison of measured and theoretical laminar by-pass resistance

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Figure 11

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

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Figure 12

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



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