The Experts below are selected from a list of 1569 Experts worldwide ranked by ideXlab platform
Qingxia Liu - One of the best experts on this subject based on the ideXlab platform.
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Experimental and numerical study of cavitating particulate flows in a Venturi tube
Chemical Engineering Science, 2020Co-Authors: Hongbo Shi, Qingxia Liu, Petr A. NikrityukAbstract:Abstract Cavitating Venturi Tubes play a significant role in mineral processing and their performance depends to a great extent on the presence of solid particles. This work is devoted to experimental and numerical studies of cavitation phenomena in a Venturi tube with different solid mass concentrations (Ws = 5–30 wt%). Numerical simulation is carried out with an axisymmetric 2D CFD-based model available in the commercial CFD software ANSYS FLUENT 16.2. The simulation is conducted using the Eulerian-Eulerian approach. A new four-phase global model was developed based on a simpler engineering approach and validated against experimental data. Predictions of the pressure drop obtained from the CFD model are generally in good conformance with experimental measurements. Both the numerical and experimental studies reveal that the addition of solid particles in the cavitating Venturi tube has significant effects on the generation of cavitation. The outcomes show that the higher solid mass concentration is of benefit to cavitation intensity. The proposed CFD model has proved to be an efficient and reliable tool in predicting the cavitation activities and performance characteristics of the cavitating Venturi tube.
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Experimental and numerical study of cavitation flows in Venturi Tubes: From CFD to an empirical model
Chemical Engineering Science, 2019Co-Authors: Hongbo Shi, Petr A. Nikrityuk, Qingxia LiuAbstract:Abstract This work is devoted to experimental and numerical studies of cavitation phenomena in Venturi Tubes with different geometries. A two-phase mixture model has been validated against experimental data. The numerical results showed good agreement with the experimental data. Experimental studies have been carried out for two different Venturi Tubes with convergent angles of 19 ° and 45 ° , respectively. The effect of the convergent angle on the cavitation performance was investigated experimentally and numerically. Both the numerical and experimental studies reveal that the change in the convergent angle has significant effects on flow characteristics and the generation of cavitation. It was shown that a 45 ° convergent angle enhances cavitation in comparison with 19 ° angle. A scaled-up study of the Venturi geometry has been conducted using CFD-based numerical simulations. Finally, a semi-empirical model enabling the prediction of cavitation in Venturi Tubes has been developed and validated.
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Study of Venturi tube geometry on the hydrodynamic cavitation for the generation of microbubbles
Minerals Engineering, 2019Co-Authors: Mingda Li, Adrien Bussonnière, Matthew Bronson, Zhenghe Xu, Qingxia LiuAbstract:Abstract Venturi Tubes have been extensively used to generate microbubbles through hydrodynamic cavitation. Due to their simple and flexible design, Venturi Tubes have been used in a wide range of applications including mineral flotation. Although the impacts of the geometries of Venturi Tubes on hydrodynamic cavitation have been studied in different specific contexts, no clear relation between cavitation and geometry parameters of Venturi Tubes has been reported. In this work, we investigated numerically and experimentally the influence of several geometrical parameters on the cavitation inception detected by a hydrophone and the microbubble generation measured by a high-speed camera. Using a dimensionless number analysis, we found that the cavitation inception was determined by flow resistance, which significantly depends on the geometrical design of Venturi tube. In the cavitation regime, the flow resistance induced by cavitation increases linearly with reducing downstream cavitation number while the upstream cavitation number becomes constant regardless of the geometry of Venturi tube. A small outlet angle results in a low cavitation inception and a high microbubble production. Moreover, the degree of microbubble generation was found to increase with extra flow resistance and the dissolved gas concentration. The insights from this study provide a guideline for the design of efficient Venturi Tubes for hydrodynamic cavitation system.
Michael Reader-harris - One of the best experts on this subject based on the ideXlab platform.
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Venturi Tube Discharge Coefficient in High-Pressure Gas
Experimental Fluid Mechanics, 2015Co-Authors: Michael Reader-harrisAbstract:In this chapter the performance of Venturi Tubes in high-pressure gas is described: the discharge coefficient tends to increase with Reynolds number largely because of static-hole error, the effect that pressure tappings of finite size do not measure the pressure which would have been measured using an infinitely small hole. There are also effects of throat velocity, including humps and dips in the calibration curve, sometimes an audible tone. The discharge coefficient depends on the shape of the Venturi tube: of the different shapes tested the best results were obtained with a Venturi tube identical to the standard Venturi tube with a machined convergent except that the convergent angle was 10.5° (instead of 21°).
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Venturi Tube Design
Experimental Fluid Mechanics, 2015Co-Authors: Michael Reader-harrisAbstract:This chapter describes the main design specifications for classical Venturi Tubes : it points the reader to important parts of ISO 5167 and gives reasons for the requirements in the standard. It covers the different types: their shape and their discharge coefficient. It includes the tappings, the dimensional measurements, the effect of roughness and the pressure loss. Gas flow at high Reynolds number and the effect of upstream fittings are not covered here: they are in Chaps. 7 and 8 respectively. The basic instruction remains to follow ISO 5167-4, probably with only one tapping, instead of four tappings, in each plane.
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Orifice Plates and Venturi Tubes
Experimental Fluid Mechanics, 2015Co-Authors: Michael Reader-harrisAbstract:This book gives the background to differential-pressure flow measurement and goes through the requirements explaining the reason for them. For those who want to use an orifice plate or a Venturi tube the standard ISO 5167 and its associated Technical Reports give the instructions required. However, they rarely tell the users why they should follow certain instructions. This book helps users of the ISO standards for orifice plates and Venturi Tubes to understand the reasons why the standards are as they are, to apply them effectively, and to understand the consequences of deviations from the standards
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AN IMPROVED MODEL FOR Venturi-TUBE OVER- READING IN WET GAS
2009Co-Authors: Michael Reader-harris, Tuv NelAbstract:Venturi Tubes are commonly selected for the measurement of wet-gas flows. Reasons for this include their physical robustness to withstand erosion and the impact of liquid slugs at high velocities, familiarity with their use and the availability of standards fo
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Swirling Flow Through Venturi Tubes of Convergent Angle 10.5° and 21°
Volume 2: Fora, 2006Co-Authors: Jeff Gibson, Michael Reader-harrisAbstract:Computational Fluid Dynamics (CFD) was used to compute the effect of two bends in perpendicular planes on the performance of 4-inch Venturi Tubes with β = 0.4, 0.6 and 0.75 for water at a Reynolds number of 350,000 and at various distances from the bend. Two types of Venturi Tubes were analysed, the first having a standard convergent angle of 21°, the second having a non-standard convergent angle of 10.5°. Good agreement with experiment was obtained. Swirling axisymmetric flows were computed to help interpret experimental data.Copyright © 2006 by ASME
A. Selamet - One of the best experts on this subject based on the ideXlab platform.
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WAVE PROPAGATION AND ATTENUATION IN HERSCHEL-Venturi Tubes
Journal of the Acoustical Society of America, 1997Co-Authors: A. Selamet, V. EaswaranAbstract:Wave propagation and attenuation in a classical flow metering device, the Herschel–Venturi tube, is investigated analytically and experimentally. The analytical results are shown to compare well with the experimental observations for anechoically terminated Herschel–Venturi Tubes. In the absence of flow, the Taylor series approximations to the governing differential equations and the stepwise expansion and contraction method are shown to be identical. The effect of mean flow on the wave attenuation performance of Herschel–Venturi Tubes is also studied in terms of a solution obtained by the Runge–Kutta method, and the applicability of the stepwise expansion and contraction method is discussed with the mean flow through the duct.
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The effect of duct cross‐sectional area variation on acoustic and flow performance: Herschel Venturi Tubes versus Universal Venturi Tubes
Journal of the Acoustical Society of America, 1995Co-Authors: A. SelametAbstract:Following an earlier work by Selamet et al. [Proc. Inter‐Noise 95, 425–430 (1995)], the present analytical, computational, and experimental study investigates the effect of duct cross‐sectional area variation on the wave attenuation and flow performance. Two different Venturi configurations, Herschel Venturi Tubes and Universal Venturi Tubes, are compared. Four Venturi Tubes are fabricated in each category with duct to throat cross‐sectional area ratios varying from 2 to 16 and used in the experimental effort. The results from these configurations are then discussed in terms of the acoustic attenuation versus flow efficiency.
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the effect of duct cross sectional area variation on acoustic and flow performance herschel Venturi Tubes versus universal Venturi Tubes
Journal of the Acoustical Society of America, 1995Co-Authors: A. SelametAbstract:Following an earlier work by Selamet et al. [Proc. Inter‐Noise 95, 425–430 (1995)], the present analytical, computational, and experimental study investigates the effect of duct cross‐sectional area variation on the wave attenuation and flow performance. Two different Venturi configurations, Herschel Venturi Tubes and Universal Venturi Tubes, are compared. Four Venturi Tubes are fabricated in each category with duct to throat cross‐sectional area ratios varying from 2 to 16 and used in the experimental effort. The results from these configurations are then discussed in terms of the acoustic attenuation versus flow efficiency.
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Noise attenuation by Venturi Tubes
Journal of the Acoustical Society of America, 1994Co-Authors: A. SelametAbstract:The reactive silencers installed in the induction and exhaust systems of production vehicles involve a compromise between the noise reduction and the flow efficiency. The present study considers Venturi Tubes as low flow‐loss elements and investigates their acoustic attenuation performance in terms of two approaches: the first one combines the solutions of one‐dimensional wave propagation in conical reducers and diffusers, and straight ducts; while the second one approximates the variation in the cross‐sectional area by a series of stepwise contractions and expansions. The results from both approaches are shown to agree well for a number of Venturis constructed for the experimental validation. Transmission loss predictions are then compared to the data obtained from an extended impedance tube setup. Finally, the acoustic attenuation and the flow performance are presented for one of the constructed Venturi Tubes against a limit configuration: a contraction chamber with the diameters defined by the duct and throat dimensions of the Venturi tube.
Petr A. Nikrityuk - One of the best experts on this subject based on the ideXlab platform.
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Experimental and numerical study of cavitating particulate flows in a Venturi tube
Chemical Engineering Science, 2020Co-Authors: Hongbo Shi, Qingxia Liu, Petr A. NikrityukAbstract:Abstract Cavitating Venturi Tubes play a significant role in mineral processing and their performance depends to a great extent on the presence of solid particles. This work is devoted to experimental and numerical studies of cavitation phenomena in a Venturi tube with different solid mass concentrations (Ws = 5–30 wt%). Numerical simulation is carried out with an axisymmetric 2D CFD-based model available in the commercial CFD software ANSYS FLUENT 16.2. The simulation is conducted using the Eulerian-Eulerian approach. A new four-phase global model was developed based on a simpler engineering approach and validated against experimental data. Predictions of the pressure drop obtained from the CFD model are generally in good conformance with experimental measurements. Both the numerical and experimental studies reveal that the addition of solid particles in the cavitating Venturi tube has significant effects on the generation of cavitation. The outcomes show that the higher solid mass concentration is of benefit to cavitation intensity. The proposed CFD model has proved to be an efficient and reliable tool in predicting the cavitation activities and performance characteristics of the cavitating Venturi tube.
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Experimental and numerical study of cavitation flows in Venturi Tubes: From CFD to an empirical model
Chemical Engineering Science, 2019Co-Authors: Hongbo Shi, Petr A. Nikrityuk, Qingxia LiuAbstract:Abstract This work is devoted to experimental and numerical studies of cavitation phenomena in Venturi Tubes with different geometries. A two-phase mixture model has been validated against experimental data. The numerical results showed good agreement with the experimental data. Experimental studies have been carried out for two different Venturi Tubes with convergent angles of 19 ° and 45 ° , respectively. The effect of the convergent angle on the cavitation performance was investigated experimentally and numerically. Both the numerical and experimental studies reveal that the change in the convergent angle has significant effects on flow characteristics and the generation of cavitation. It was shown that a 45 ° convergent angle enhances cavitation in comparison with 19 ° angle. A scaled-up study of the Venturi geometry has been conducted using CFD-based numerical simulations. Finally, a semi-empirical model enabling the prediction of cavitation in Venturi Tubes has been developed and validated.
Hongbo Shi - One of the best experts on this subject based on the ideXlab platform.
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Experimental and numerical study of cavitating particulate flows in a Venturi tube
Chemical Engineering Science, 2020Co-Authors: Hongbo Shi, Qingxia Liu, Petr A. NikrityukAbstract:Abstract Cavitating Venturi Tubes play a significant role in mineral processing and their performance depends to a great extent on the presence of solid particles. This work is devoted to experimental and numerical studies of cavitation phenomena in a Venturi tube with different solid mass concentrations (Ws = 5–30 wt%). Numerical simulation is carried out with an axisymmetric 2D CFD-based model available in the commercial CFD software ANSYS FLUENT 16.2. The simulation is conducted using the Eulerian-Eulerian approach. A new four-phase global model was developed based on a simpler engineering approach and validated against experimental data. Predictions of the pressure drop obtained from the CFD model are generally in good conformance with experimental measurements. Both the numerical and experimental studies reveal that the addition of solid particles in the cavitating Venturi tube has significant effects on the generation of cavitation. The outcomes show that the higher solid mass concentration is of benefit to cavitation intensity. The proposed CFD model has proved to be an efficient and reliable tool in predicting the cavitation activities and performance characteristics of the cavitating Venturi tube.
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Experimental and numerical study of cavitation flows in Venturi Tubes: From CFD to an empirical model
Chemical Engineering Science, 2019Co-Authors: Hongbo Shi, Petr A. Nikrityuk, Qingxia LiuAbstract:Abstract This work is devoted to experimental and numerical studies of cavitation phenomena in Venturi Tubes with different geometries. A two-phase mixture model has been validated against experimental data. The numerical results showed good agreement with the experimental data. Experimental studies have been carried out for two different Venturi Tubes with convergent angles of 19 ° and 45 ° , respectively. The effect of the convergent angle on the cavitation performance was investigated experimentally and numerically. Both the numerical and experimental studies reveal that the change in the convergent angle has significant effects on flow characteristics and the generation of cavitation. It was shown that a 45 ° convergent angle enhances cavitation in comparison with 19 ° angle. A scaled-up study of the Venturi geometry has been conducted using CFD-based numerical simulations. Finally, a semi-empirical model enabling the prediction of cavitation in Venturi Tubes has been developed and validated.
