A study of mass flow rate measurement based on the vortex shedding principle

Zhang, Hongjian; Huang, Yongmei; Sun, Zhiqiang

doi:10.1016/j.flowmeasinst.2005.08.002

Cited by 45 publications

(23 citation statements)

References 14 publications

(17 reference statements)

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“…The typical constancy of the calibration factor for the considered class of flow-meters is of the order of ±0.7% -±1% over a dynamic range of 3 -6 [1,3,10,13,19]. In order to find the calibration with a relative precision of let's say ±0.1% of the measured value, it is first necessary to measure the volume, the number of vortices and the time with a resolution better than ±0.1%.…”

Section: Accuracy Of the Measurementsmentioning

confidence: 99%

“…Owing to the negligible dependence of α with Re D , a constant value of α = 1.455 is assumed to compute the , a dynamic range of about 4.5 which is comparable to the state of the art [1,3,10,13,19]. The latter might be improved by using a testing tunnel of rectangular section.…”

Section: The Variations Ofmentioning

confidence: 99%

“…As the Reynolds number increases, the vortex sheets first give nice stable and periodic roller shaped vortices to form the "von Kármán vortex street" (see figure 1). For Reynolds numbers of the order of 10 2 , there is a unique frequency f that is usually given in a dimensionless form with a Strouhal * corresponding author Email address: florent.ravelet@ensta.org (F. Ravelet) number St = f ·d v1 . In this intermediate Reynolds numbers range, the Strouhal number varies with the Reynolds number monotonically.…”

Section: Introductionmentioning

confidence: 99%

“…The downstream flow qualitatively exhibits the same phenomena as that observed in the case of a free medium: the wake is still well formed, limited by two streamlines with a constant average pressure and there exists a main frequency. Studies of several researchers show that parameters such as the confinement, the turbulence, the end effects, the geometric shape and the vibration of the bluff body affect quantitatively the overall value of the Strouhal number [6][7][8][9][10][11]. One question is to identify the choice of typical length scale and velocity scale that would give the simplest expression of a Strouhal number as a function of the Reynolds number and the confinement.…”

Section: Introductionmentioning

confidence: 99%

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High accuracy volume flow rate measurement using vortex counting

Zaaraoui¹,

Ravelet²,

Margnat³

et al. 2013

Flow Measurement and Instrumentation

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A prototype device for measuring the volumetric flow-rate by counting vortices has been designed and realized. It consists of a square-section pipe in which a two-dimensional bluff body and a strain gauge force sensor are placed. These two elements are separated from each other, unlike the majority of vortex apparatus currently available. The principle is based on the generation of a separated wake behind the bluff body. The volumetric flow-rate measurement is done by counting vortices using a flat plate placed in the wake and attached to the beam sensor. By optimizing the geometrical arrangement, the search for a significant signal has shown that it was possible to get a quasi-periodic signal, within a good range of flow rates so that its performances are well deduced. The repeatability of the value of the volume of fluid passed for every vortex shed is tested for a given flow and then the accuracy of the measuring device is determined. This quantity is the constant of the device and is called the digital volume (V p ). It has the dimension of a volume and varies with the confinement of the flow and with the Reynolds number. Therefore, a dimensionless quantity is introduced, the reduced digital volume (V r ) that takes into account the average speed in the contracted section downstream of the bluff body. The reduced digital volume is found to be independent of the confinement in a significant range of Reynolds numbers, which gives the device a good accuracy.

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Section: Accuracy Of the Measurementsmentioning

confidence: 99%

Section: The Variations Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High accuracy volume flow rate measurement using vortex counting

Zaaraoui¹,

Ravelet²,

Margnat³

et al. 2013

Flow Measurement and Instrumentation

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show abstract

“…They divided the lift force acting on the vortex shedder by the vortex shedding frequency, and yielded a signal that was proportional to the mass flow rate. Zhang et al extracted the vortex shedding frequency and the pressure drop across a bluff body from the wall pressure difference by a single sensor, and related the mass flow rate directly to the quotient of pressure drop divided by vortex shedding frequency [12]. Sun achieved the measurement of mass flow rate of homogeneous gas-liquid bubble flow with combined use of a Venturi tube and a vortex flowmeter [13].…”

Section: Introductionmentioning

confidence: 99%

Development of the Vortex Mass Flowmeter with Wall Pressure Measurement

Li¹,

Sun²

2013

Measurement Science Review

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Mass flow measurement is essential to the understanding and control of processes concerning fluid flow. The availability of reliable mass flowmeters, however, is far inadequate to meet the demand. In this paper we developed a practical vortex mass flowmeter with wall pressure measurement. The meter coefficient of mass flow rate was acquired through experiments with air at Reynolds numbers from 1.3×10 3 to 9.8×10 3 . Here we show that the meter coefficient of mass flow rate is nearly constant at Reynolds numbers greater than 5.5×10 3 . To further extend the lower limit, a correction factor related to the Reynolds number was introduced into the vortex mass flowmeter. The results show that the relative errors of the vortex mass flowmeter developed are basically within ±5%. This device can satisfy a diversity of requirements of mass flow measurement in engineering fields.

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A novel technique for solid mass loading measurement in dilute gas–solid two‐phase flow by vortex flow meter based on vortex shedding principles

Shirvani

Hashemabadi

2019

Asia-Pacific J Chem Eng

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Vortex flowmeter has broad applications in industrial single-phase flow problems. There is experimental evidence suggesting that the presence of particles in gas-solid flows may cause a modulation in the turbulence intensity of the carrier phase. Using vortex flowmeter, one may manipulate vortex shedding generated by a bluff body and, therefore, change pressure fluctuation after bluff body and pressure drop between two sides of the vortex shedder. In this research, a vortex flowmeter with a differential pressure sensor was used to experimentally measure solid mass loading in a dilute gas-solid two-phase flow. The results indicated that the average bluff body pressure drop in gas-solid flows is always more than that occurring in gas flows, and the presence of particles can both attenuate and augment vortex shedding frequency. The results also showed that one can obtain the solid mass loading by means of pressure drop signals with a maximum relative error of 5%, which may be advantageous for industrial process measurement.KEYWORDS differential pressure, dilute gas-solid two-phase flow, solid mass loading measurement, vortex flowmeter

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A study of mass flow rate measurement based on the vortex shedding principle

Cited by 45 publications

References 14 publications

High accuracy volume flow rate measurement using vortex counting

High accuracy volume flow rate measurement using vortex counting

Development of the Vortex Mass Flowmeter with Wall Pressure Measurement

A novel technique for solid mass loading measurement in dilute gas–solid two‐phase flow by vortex flow meter based on vortex shedding principles

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