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A research on the correction method for flow coefficient of annubar flowmeters

The flow in an annubar flowmeter with diameter of 300 mm was numerically simulated by the method of computational fluid dynamics(CFD).A k-e based model of turbulence was applied to solve the problem.The control equations were discretized with the finite volume method.The flow coefficients of annubar flowmeter in several different lengths of straight pipe before were calculated.The relationship between the flow coefficient and the Reynolds number was studied.A trend of a rising flow coefficient of flowmeter with increased Reynolds number was found.At the end of the article,the flow coefficient of the insufficiently developed section was amended.A fitting curve with power of three between the flow coefficient and the Reynolds number was obtained.By using the curve,the value of measurement in insufficiently developed sections can be corrected to the value in sufficiently developed sections.While the length of the pipe was not long enough,a more precise value of measurement can be also achieved.