Two-phase flow measurements at high void fraction by a Venturi meter

Monni, Grazia; Salve, Mario De; Panella, Bruno

doi:10.1016/j.pnucene.2014.06.006

Cited by 23 publications

(7 citation statements)

References 7 publications

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“…This leads to a high value of the venturi discharge coefficient, much larger than that of the orifice meter discharge coefficient, which usually falls between 0.58 and 0.65. Both the tendency of the curve and the final stable value agree well with Monni et al’s report to some degree.…”

Section: Resultssupporting

confidence: 91%

“…For a given venturi, the throat diameter ratio is fixed (β = 0.4 in this work) and only the effect of the Reynolds number needs to be considered. As reported by Monni et al, the dependence of the discharge coefficient on the Reynolds number can be approximated by an exponential law of the type with coefficients a and b obtained from the experimental data: …”

Section: Model Developmentmentioning

confidence: 95%

See 1 more Smart Citation

Solid-Mass Flow-Rate Prediction in Dense-Phase Pneumatic Conveying of Pulverized Coal by a Venturi Device

Guo

Liu

et al. 2016

Ind. Eng. Chem. Res.

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This paper aims at predicting the solid-mass flow rate of pulverized coal in dense-phase pneumatic conveying systems. A one-dimensional model was developed based on the proper modification of a dilute-flow model by inserting a two-phase flow multiplier. The relationships between the model parameters (discharge coefficient and pressure ratio parameter) and the hydrodynamic nondimensional numbers (Reynolds and Stokes numbers) were determined, and the fitting coefficients were obtained from calibration tests by using regression analysis. Two methods attached to the model were proposed to predict the solid-mass flow rate, and both can provide satisfactory predictions with acceptable errors. These results indicated the possibility of applying a venturi device to measure the solid-mass flow rate at high-pressure and dense-phase conditions.

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Section: Resultssupporting

confidence: 91%

Section: Model Developmentmentioning

confidence: 95%

Solid-Mass Flow-Rate Prediction in Dense-Phase Pneumatic Conveying of Pulverized Coal by a Venturi Device

Guo

Liu

et al. 2016

Ind. Eng. Chem. Res.

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show abstract

“…Measurements of pressure drops of a vertical upward annular air–water flow between the inlet and throat and between inlet and outlet sections of a Venturi have been performed by Monni et al. 8 They derived a relationship between the pressure drops and the phase superficial velocities as well as the mass flow rate of the mixture. They reported that the quality was estimated with an accuracy of 5%, while those of the gas and liquid mass flow rates can be evaluated with accuracies better than 2 and 30%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Single- and two-phase pressure drop through vertical Venturis

Messilem

Aberqi

Zeghloul

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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An experimental investigation of the pressure drops measurements in a Venturi placed in a vertical pipe is achieved. Venturis with diameter ratios equal to 0.4, 0.55, and 0.75 were employed. Differential pressure transducers were used to measure the pressure drop between the Venturi inlet and the throat sections. The void fraction was measured upstream the Venturi using a conductance probe technique. Air and water superficial velocities ranges were chosen to cover single-phase flow and bubbly, slug, and churn flow regimes. The single-phase pressure drop increases with the liquid superficial velocity. The Venturi pressure drop coefficient increases with decreasing the Venturi area ratio. The discharge coefficient increases slightly with this ratio and approaches a value of unity at high Reynolds number. The two-phase flow pressure drop and the multiplier coefficient increase with the gas superficial velocity and with decreasing the area ratio. Dimensionless pressure drop decreases with increasing the liquid to gas superficial velocity ratio and approaches an asymptotic value at high ratio (greater than 10). This value matches the single-phase flow dimensionless pressure drop value at high Reynolds number. The Venturi with area ratio equal to 0.55 was shown to correlate well the two-phase multiplier and the liquid holdup.

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“…The latter shows a more significant effect on the flow through Venturi than it is in the straight pipe. Monni et al 17 analysed experimentally the irreversible pressure drop along the distance from the inlet to the throat and from the inlet to the outlet section of the Venturi for vertical annular (wet gas) two-phase flow with a void fraction higher than 97%. They used the quick closing valve for the volumetric void fraction measurement.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study and experimental measurement of the gas liquid two-phase flow through a vertical Venturi meter

Zeghloul

Messilem

Ghendour

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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An accurate two-phase flow rate measurement is essential in many applications and industries such as; oil/gas, chemical, pipeline transportation and nuclear industry. This paper presents the findings obtained from two-phase flow rate measurements using Venturi meters coupled with conductance probe sensors. The measurement system and presented methodology can be used to directly and continuously measure the mass flow rate of gas-liquid flows without any need for using a separator. Most of the available data in literature on mass flow rate using Venturis in gas-liquid two phase flows are limited/valid to a certain flow regime. However, the experimental data presented in this paper covered a wide range of flows (i.e. bubbly, slug and churn flows). Three Venturis with different diameter ratios, β = 0.40, β = 0.55 and β = 0.75 have been employed using an air-water vertical test section. The effect of the Venturi’s geometry on the flow behaviour was also evaluated. The average void fraction and void fraction time series have been measured along the test section by nine different conductance probe sensors covering the convergent, throat and divergent sections. In addition, the two-phase pressure drop across the Venturi was measured. Moreover, a new correlation for the gas-liquid slip ratio was proposed in this paper, which is necessary for calculating the two-phase mass flow rate. The proposed slip ratio correlation showed more accuracy than the ones available in literature. It was found that the correlation proposed by Chisholm to predict the two-phase mass flow rate in Venturis with a diameter ratio, β = 0.55, shows the best accuracy among others such as; Murdock, Lin, James and Zhang correlations.

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Two-phase flow measurements at high void fraction by a Venturi meter

Cited by 23 publications

References 7 publications

Solid-Mass Flow-Rate Prediction in Dense-Phase Pneumatic Conveying of Pulverized Coal by a Venturi Device

Solid-Mass Flow-Rate Prediction in Dense-Phase Pneumatic Conveying of Pulverized Coal by a Venturi Device

Single- and two-phase pressure drop through vertical Venturis

Theoretical study and experimental measurement of the gas liquid two-phase flow through a vertical Venturi meter

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