Apparatus for measuring mass flow of fluids
AssigneeLucas Industries Limited
InventorAlan Thomas
Life of this patent
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Abstract
An apparatus for measuring the mass flow of fluids comprises a fluidic oscillator which oscillates at a frequency dependent on the volume flow rate through the oscillator, a circuit is responsive to signals which are respectively dependent on the oscillating frequency and on the pressure difference across the oscillator to generate an output signal proportional to 2Sc.sub.o.sup.3/2 A.sub.o.sup.2. P/f where S = strouhal number of the oscillator c.sub.o = orifice coefficient of the oscillator A.sub.o = equivalent area of the oscillator P = pressure difference across the oscillator f = frequency of oscillation.
Claims3
An apparatus for measuring the mass flow rate of fluids, comprising a fluidic oscillator, the frequency of oscillation of which is a function of the volume flow rate therethrough, means for generating a first electrical signal dependent on said frequency of oscillation, means for generating a second electrical signal dependent on the pressure difference across said oscillator, and means, responsive to said first and second electrical signals, for generating an output signal proportional to
- 2Sc.sub.o.sup.3/2 A.sub.o.sup.2. P/f
- where
- S = Strouhal number of said oscillator
- c.sub.o = coefficient of said oscillator
- A.sub.o = equivalent area of said oscillator
- and are fixed functions of said oscillator, and P and f respectively are said pressure difference and said frequency of oscillation.
Dependencies are inferred from the claim text.