How to directly measure the mean flow velocity in square cross-section pipes

Dinardo, Giuseppe; Fabbiano, Laura; Vacca, Gaetano

doi:10.1016/j.flowmeasinst.2016.03.001

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…The earliest application is probably the quality of the main flow-rate measurement which is dependent on the location of the velocity measurement points in the duct section. Recommendations exist for performing such measurements (international standards ISO 3966, ISO 7145, DIN EN 12599 [1], Dinardo et al 2016 [2]), generally by taking the measurement in a zone where turbulent flow is assumed established. However, in real-scale applications, flow establishment is difficult to obtain, raising many questions regarding the representativeness of flow-rate measurements in duct flows.…”

Section: Introductionmentioning

confidence: 99%

Flow characterization of various singularities in a real-scale ventilation network with rectangular ducts

Malet

Radosavljevic

Mbaye

et al. 2022

Building and Environment

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Section: Introductionmentioning

confidence: 99%

Flow characterization of various singularities in a real-scale ventilation network with rectangular ducts

Malet

Radosavljevic

Mbaye

et al. 2022

Building and Environment

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“…The radiometric, optical and microwave sensors can be used to measure the cross-sectional velocity distribution of particles in both circle and square pipes [3], [4]. An averaged particle velocity can be calculated based on the velocity distribution obtained by scanning the measurement point with a laser doppler velocimetry (LDV) system [5], [6]. However, the performance of this method is significantly influenced by the variation of flow status as the measurement takes a long time to complete.…”

mentioning

confidence: 99%

“…However, the performance of this method is significantly influenced by the variation of flow status as the measurement takes a long time to complete. Dinardo et al [6] used a laser Doppler anemometer (LDA) to measure the punctual velocities in the cross-section of a square-shaped pipe. They provided an empirical formula for evaluating the mean flow rate at a fixed location (approximately 0.78 of the transverse dimension on the main axis of the pipe section) in the pipe cross-section.…”

mentioning

confidence: 99%

Measurement of Cross-Sectional Velocity Distribution of Pneumatically Conveyed Particles in a Square-Shaped Pipe Through Gaussian Process Regression-Assisted Nonrestrictive Electrostatic Sensing

Wang

Qian

Wang

et al. 2023

IEEE Trans. Instrum. Meas.

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Online continuous measurement of the crosssectional velocity distribution of pneumatically conveyed solids in a square-shaped pipe is desirable in monitoring and optimizing circulating fluidized beds, coal-fired power plants and exhaust pipes. Due to the limitation of non-restrictive electrostatic sensors in spatial sensitivity, it is difficult to accurately measure the velocity of particles in large-diameter pipes. In this paper, a novel approach is presented for the measurement of cross-sectional particle velocity distribution in a square-shaped pipe using sensors and Gaussian process regression (GPR). The electrostatic sensor includes twelve pairs of strip-shaped electrodes. Experimental tests were conducted on a laboratory test rig to measure the crosssectional particle velocities in a vertical square-shaped pipe under various experimental conditions. The GPR model is developed to infer the relationship between the input variables of velocities and the cross-sectional velocity distribution of particles in nine areas of the pipe cross-section and the performance of the built models was compared with other machine learning models. The relative error of velocities predicted under all the experimental conditions is within ±3%. When the training dataset is not comprehensive enough, the performance of the model is negatively affected, and the relative error range is -9% to +15%. With fewer measurement electrodes (input variables), the relative error of the predicted velocities in each area increases slightly, but remains within ±5%. Results obtained suggest that the electrostatic sensor in conjunction with the GPR model is a feasible approach to obtain the cross-sectional velocity distribution of pneumatically conveyed particles in a square-shaped pipe.

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Validation of a method for fluid flow rate measurement in square ducts by means of laser velocimetry

Fabbiano

Dinardo

Vacca

2020

J. Phys.: Conf. Ser.

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The paper deals with the introduction of an alternative method for the evaluation of the fluid flow rate through a square pipe, by directly measuring the flow mean velocity at a fixed location in the section area. The authors of this paper have previously introduced a way for the evaluation of the fluid flow rate, by measuring a single point flow velocity in square pipes. In this study, the authors perform a series of considerations aimed at the validation of the proposed methodology, by comparing it with prescribed procedures described by ISO 3966:2008 standard. In this standard a method for the evaluation of fluid flow rate (under specific fluid dynamic conditions) is stated from velocity measurements performed in a-priori fixed points (in a given test section and to be defined according to the cross-section shape), using a static Pitot-tube (or equivalent equipment). In this work, the authors validate the proposed simplified method against the Log-Thebycheff procedure (according to the same standard). A Laser Doppler Anemometer (LDA) has been used.

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How to directly measure the mean flow velocity in square cross-section pipes

Cited by 4 publications

References 5 publications

Flow characterization of various singularities in a real-scale ventilation network with rectangular ducts

Flow characterization of various singularities in a real-scale ventilation network with rectangular ducts

Measurement of Cross-Sectional Velocity Distribution of Pneumatically Conveyed Particles in a Square-Shaped Pipe Through Gaussian Process Regression-Assisted Nonrestrictive Electrostatic Sensing

Validation of a method for fluid flow rate measurement in square ducts by means of laser velocimetry

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