Influence of blockage and upstream disturbances on the performance of a vortex flowmeter with a trapezoidal bluff body

Arumuru, Venugopal; Agrawal, Amit; Prabhu, Santosh

doi:10.1016/j.measurement.2010.01.010

Cited by 36 publications

(20 citation statements)

References 16 publications

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“…The latter could be achieved by decreasing the flow area or, equivalently, by increasing the width D of the bluff body leading to an increase of BR. In study [8], a BR value of 0.30 was experimentally found to be optimum, while in [4], a BR value of 0.33 was numerically found to cause the greater increase in pressure amplitude for the device under consideration. Besides the above reasoning, in practice, values of BR greater than the optimum may inhibit the vortex shedding phenomenon and lead to its sup- pression, due to the proximity of walls in smaller distances to the bluff body.…”

Section: Unsteady Pressure Evolution For Different Blockage Ratiosmentioning

confidence: 94%

“…According to the literature [8], the blockage ratio (BR) plays an important role in the pressure variation ampli- tude. In the region near the point where maximum pressure variation occurs and pressure is minimum, the velocity accordingly becomes maximum.…”

Section: Unsteady Pressure Evolution For Different Blockage Ratiosmentioning

confidence: 99%

“…Some of these studies concern the shape of the bluff body to be installed in a channel in order to continuously produce significant vortex shedding. This objective is the same with that for the design of an effective flow meter [8,9]. An interesting perspective aiming to enhance vortex shedding relies on the use of multiple bluff bodies in tandem [10,11] A very good and compact literature review on these issues can be found in [4], according to which, further research is required to enhance power produced by such devices for practical use.…”

Section: Introductionmentioning

confidence: 99%

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Parametric CFD study of micro-energy harvesting in a flow channel exploiting vortex shedding

Koubogiannis

2016

Open Engineering

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Miniature energy harvesting devices are increasingly used in various fields. For example, Wireless Sensor Networks have recently made great progress in many applications. However, their main drawback, i.e. the limited duration of operation, poses the requirement for an effective way to recharge their batteries. In this context, the present work focuses on the study of micro-energy harvesting from flow by exploiting vortex shedding behind bluff bodies, in order to cause oscillations to a piezoelectric film and generate the required electrical power. To this end, a Computational Fluid Dynamics (CFD) tool is validated on a particular miniature device configuration proposed in the literature and implemented for the numerical simulations of flow around bluff micro-bodies in a very small channel. Aiming to enhance vortex shedding, parametric studies corresponding to different bluff body shapes and arrangements for a fixed Reynolds number are performed, the main parameters involved in the phenomenon are highlighted and the potential for vortex shedding exploitation is qualitatively assessed.

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Section: Unsteady Pressure Evolution For Different Blockage Ratiosmentioning

confidence: 94%

Section: Unsteady Pressure Evolution For Different Blockage Ratiosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Parametric CFD study of micro-energy harvesting in a flow channel exploiting vortex shedding

Koubogiannis

2016

Open Engineering

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“…Venugopal et al [9] carried out the experimental investigations on the vortex flow meter with the differential wall pressure measurement method at high Re of the order of 10 5 . The research carried out in their study with different bluff bodies of different shapes such as triangular, trapezoidal, conical and ring shape with water as working medium, and it was concluded that trapezoidal prism is the best among all the bodies.…”

Section: Introductionmentioning

confidence: 99%

Transition to periodic unsteady and effects of Prandtl and Richardson numbers on the flow across a confined heated trapezoidal prism

Parveez

Dhiman

Rasool

2014

J Braz. Soc. Mech. Sci. Eng.

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“…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%

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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Influence of blockage and upstream disturbances on the performance of a vortex flowmeter with a trapezoidal bluff body

Cited by 36 publications

References 16 publications

Parametric CFD study of micro-energy harvesting in a flow channel exploiting vortex shedding

Parametric CFD study of micro-energy harvesting in a flow channel exploiting vortex shedding

Transition to periodic unsteady and effects of Prandtl and Richardson numbers on the flow across a confined heated trapezoidal prism

High accuracy volume flow rate measurement using vortex counting

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