Analysis on the effect of venturi tube structural parameters on fluid flow

Zhang, J. X.

doi:10.1063/1.4991441

Cited by 37 publications

(27 citation statements)

References 9 publications

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“…where γ is contraction ratio, d is throat diameter (mm) and Din is inlet diameter (mm). Zhang [1] found that the throat length had no discernible effect on the hydraulic performance. Hence, three parameters, including contraction angle, diffusion angle, and contraction ratio, were selected, to investigate the influence of those parameters on cavitation characteristics.…”

Section: Physical Modelmentioning

confidence: 99%

“…The venturi tube is a special kind of pipe which has been widely applied in pipeline flow measurement, internal combustion engine pressurization systems, natural gas transmission, industrial waste gas cleaning, and dust removal [1,2]. Pak and Chang [3] developed a computational model for the interactive three-phase flow in a Venturi scrubber to estimate pressure drop and collection efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Manzano et al [11] analyzed their influence of structural parameters on the velocity distribution. Zhang [1] investigated the influence of the contraction ratio, the ratio of the throat section length to diameter, the diffusion angle and the differential pressure between inlet and outlet on the mass flux and asymmetric flow.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Effect of Structural Parameters on Cavitation Characteristics for the Venturi Tube Using the CFD Method

Tang

Juárez

2019

Water

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The venturi tube is a special kind of pipe which has been widely applied in many fields. Cavitation is one of the most important research issues for the Venturi tube. Hence, three key structural parameters (contraction angle, diffusion angle and contraction ratio) were selected to investigate the influence of different factors on cavitation characteristics, using the computational fluid dynamics (CFD) method. A series of experiments for measuring the relationship between differential pressure and flow rate were carried out to verify the accuracy of the simulation method. Results showed that the simulation results had a high accuracy and the numerical method was feasible. The average vapor volume fraction of cross-section from the throat in the axial direction increased with increasing contraction angle. The cavity length increased with increasing contraction angle. The average volume fraction in the diffusion section rapidly decreased with increasing diffusion angle. The diffusion angle had no significant effect on the cavitation characteristics in the throat section and had a significant influence in the diffusion section. The average vapor volume fraction increased with decreasing contraction ratio. The contraction ratio had no significant effect on the cavity length under the same differential pressure. The average vapor volume fraction increased with decreasing contraction ratio. However, the variation in the throat section was less than the diffusion section. Under the same inlet and outlet pressure, the cavity lengths for different contraction ratios were basically the same, which indicated that the contraction ratio had no significant effect on the cavity length.

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Section: Physical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation on the Effect of Structural Parameters on Cavitation Characteristics for the Venturi Tube Using the CFD Method

Tang

Juárez

2019

Water

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“…It was also observed that the maximum aeration efficiency for the parallel venturi aeration of two modules as 0.14 kgO 2 /kWh. Authors in [27] proposed that with increasing contraction ratio, the suction and mass flow rate increases. Whereas both the suction and mass flow rate reduces as the diffusion angle increases and gave out at an optimal angle (30˚) favourable for more mass flux observed by [8], [11], [12], [18], [28] conducted a series of experiments come across at the potential of mass transfer using a venturi which connected to a downstream side and can best retched to the base of the water body.…”

Section: Introductionmentioning

confidence: 99%

Design Characteristics of Venturi Aeration System

Yadav¹,

Kumar²,

Sarkar³

2019

IJITEE

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The crucial phenomenon of air and water mixing together is called aeration. The venturi aeration is mainly responsible to transfer air directly through the atmosphere into the flowing water attribute to its simplicity and reliability. A water tank of 1000 litres capacity having dimensions 100 × 100 × 100 cm3 was used to conduct the experiments for aeration for the purpose of studying the characteristics of venturi aeration system design. Venturi having three significant sections i.e. inlet, constricted and outlet section, used as a differential pressure producer basis on Bernoulli’s theorem where the middle section of the venturi often called as constricted section is responsible for the energy conversion, which transfers oxygen by aspirating air into the constricted section and producing interfacial area between the air and water. On the basis of dimensional analysis, non-dimensional numbers associated with geometric, dynamic and process parameters were analysed. The non-dimensional geometric parameters like throat length (tl), hole distance from beginning of throat (hd), throat hole diameter (th) were optimized and additionally conducted at constant flow rate (vw=0.396 m/s). To assess the performance of designed venturi, the selection of different tl as 20, 40, 60, 80 and 100 mm, with varying number of holes inserted, depends on the tl and keeping th constant at 2 mm. The SAE values were initiated more with increasing tl . The maximum SAE values was obtained with maximum number of holes open as 6.200 × 10-3 kg O2/kWh for 100 mm tl . A constant flow rate was maintained to construct the equations for the prediction of venturi aeration system’s characteristics via simulations. For the purpose of simulations different geometric conditions of the venturi design system were considered. The simulation equations developed for tl based on the Re and Fr are subjected to 12.655 × 10-5 > Re > 2.531 × 10-5 and 1.251 < Fr < 6.256, respectively. It was also concluded that from the nondimensional study, the simulation equation developed for NDSAE based on the tl be valid and subjected to 3.890× 103 < NDSAE <0.215× 103 .

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“…With the wind air density forced to pass through the reduced throat gap spacing, the minimum pressure occurs at the throat region between the inlet and outlet sections. Moreover, given an inlet pressure, an increase of pressure difference between the inlet and outlet of venturi tube makes the throat pressure drop further[43].The gap spacing d is selected based on the fact that higher fluttering frequency leads to a faster charge transfer between the electrodes, thus increasing the output electric signals.Figure 2(c) validates the output voltage with the various gap spacing tested at 5 m.s-1. When the gap spacing is 8 mm (wider), higher pressure at the throat leads to slower flag fluttering frequency with decrease in charge transfer while a 0.2 mm (narrow) gap spacing results in a faster fluttering frequency with faster charge transfer.The narrow gap spacing may be advantageous in terms of smaller device volume, higher contact area and increased device robustness but also for better performance of charge transfer efficiency.…”

mentioning

confidence: 99%

Compact and high performance wind actuated venturi triboelectric energy harvester

et al. 2019

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The growing need for alternative sources to power Internet of Things and autonomous devices has led to many energy harvesting solutions from ambient energy sources. Use of batteries requires complementary energy source for extending the lifetime of the device. In recent times, triboelectric nanogenerators have gained significant attention in charging applications through ambient energy harvesting field due to their simplicity, efficiency and adaptability to many device configurations in nature. It is deemed to sustainably address power for autonomous smart applications in various environmental conditions. In this work, a state-of-the-art triboelectric nanogenerator based on wind actuated venturi design system is demonstrated in sync with the smart system evolution for powering various sensor nodal network. Using natural wind, the 3D printed wind actuated venturi triboelectric energy harvester converts ambient mechanical energy into electricity. This simple and compact device produces an optimum average power of 1.5 mW and produces a maximum output power density of 2850 mW.m-2 (peak power output of 4.5 mW), which is much higher than the existing reports that use larger surface area at higher wind velocity. Extensive material testing and future implementation in an array of applications aids for environment friendly energy production and increase the role of triboelectric nanogenerator in autonomous applications.

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Analysis on the effect of venturi tube structural parameters on fluid flow

Cited by 37 publications

References 9 publications

Investigation on the Effect of Structural Parameters on Cavitation Characteristics for the Venturi Tube Using the CFD Method

Investigation on the Effect of Structural Parameters on Cavitation Characteristics for the Venturi Tube Using the CFD Method

Design Characteristics of Venturi Aeration System

Compact and high performance wind actuated venturi triboelectric energy harvester

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