The Biased Laminar By-Pass Fluidic Flowmeter

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  • Geoffrey H. Priestman
    Department of Chemical and Process Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, England
  • Robert F. Boucher
    Office of Vice Chancellor, University of Sheffield, Mappin Street, Sheffield, S1 3JD, England

Abstract

<jats:p>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.</jats:p>

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