Mass flow sensing with heat waves
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Catalytic converters cannot reduce the pollutants in exhaust to the required concentration if the engine’s air-to-fuel ratio is too rich or too lean. It is therefore necessary to control automobile engines to run at the stoichiometric point; that is, the air-to-fuel ratio at which all the fuel can be burnt, leaving no oxygen at the end of the process. The control of the air-to-fuel ratio depends on two sensors: (i) an exhaust oxygen sensor which samples the exhaust gas, and (ii) a mass flow sensor which measures the mass flow of air that enters the engine. Sensor (i) was described and analyzed by Baker and Verbrugge ; see also [2; Chap. 21]. Here we concentrate on mass flow sensors.
KeywordsHeat Wave Heat Pulse Flow Sensor Slug Flow Taylor Dispersion
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- D.R. Baker and M.W. Verbrugge, Mathematical analysis of potentiometric oxygen sensors for combustion-gas streams, General Motors Research Report GMR-7900, Warren, MI (1993).Google Scholar
- A. Friedman, Mathematics in Industrial Problems,Part 6, IMA Volume 57, Springer-Verlag, New York (1993).Google Scholar
- H. Schlichting, Boundary-layer Theory, 6th edition, McGraw-Hill, New York (1968).Google Scholar
- J. Kielbasa, J. Rysz, A.Z. Smolarski and B. Stasici, The oscillatory anemometer, in “Fluid Dynamic measurements in the Industrial and Medical Environments: Proceedings of the Disa Conference,”, edited by D.J. Cockrell, pp. 65–68. Leicester University Press, Old Woking, Surrey, England (1992).Google Scholar
- J. Kliebasa, J. Piwowarezyk, J. Rysz, A.Z. Smolarski and B. Stasiecki, Heat waves in flow metrology, in “Flow Measurement of Fluids, edited by H.H. Dijstelbergen and E.A. Spencer, pp. 403–407, North-Holland, Amsterdam (1978).Google Scholar