Single and multiphase CFD simulations for designing cavitating venturi

Dastane, Gaurav G.; Thakkar, Harsh; Shah, Rushabh; Perala, Sivaramakrishna; Raut, Janhavi S.; Pandit, Aniruddha B.

doi:10.1016/j.cherd.2019.06.036

Cited by 36 publications

(22 citation statements)

References 29 publications

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“…SST k-v model developed by Menter [34] is utilized to represent turbulence in the stream field. SST k-v model is the composition of the k-v model for near-wall flows along with the k-e model for the remaining flow domain.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Experimental and numerical investigation of geometric effect on cavitation flow through orifice

Davoudi

Mahdi

2021

Mechanics & Industry

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Due to the set of factors and conditions, the stream pressure through the orifice decreases, which can lead to the occurrence of the cavitation phenomenon. The most important factor in this regard is the geometry of orifice. In the first part of this study, the flow through two types of single-hole orifice and a multi-hole orifice were experimentally studied. The results showed that the single hole orifice with a two-sided sloped edge caused less pressure drop, which in order to control the cavitation phenomenon is more efficient compared to the single-hole and multi-hole orifices with one-sided sloped edges and the same equal diameter ratio. Additionally, all experiments were simulated in the second part of this research using finite volume methods. Considering the complexity of the problem, several numerical solutions were investigated to approach the experimental results. Finally, it was determined that the type of gridding, turbulence method, and cavitation model have a great influence on the accuracy of the obtained numerical results.

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Section: Numerical Simulationsmentioning

confidence: 99%

Experimental and numerical investigation of geometric effect on cavitation flow through orifice

Davoudi

Mahdi

2021

Mechanics & Industry

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“…The FVM is a numerical technique that transforms the partial differential equations representing conservation laws over differential volumes into discrete algebraic equations over finite volumes (or elements or cells). Most researchers [10,11,15] recommend the k-ω SST model for modelling cavitation flow, therefore this turbulence model was used. Pressure velocity coupling was solved using SIMPLE algorithm, with the PRESTO!…”

Section: Numerical Solutionmentioning

confidence: 99%

Modelling of hydrodynamic cavitation for treatment of wastewater in a Venturi tube

Bolló

2020

Anal. Tech. Szeged.

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Treatment of municipal effluents has long been a challenge for modern technologies combining high effectiveness of degradation of pollutants with low costs of the process. Hydrodynamic cavitation is a promising application in wastewater treatment due to its simple reactor design. In this work, for a system available in the laboratory a hydrodynamic reactor is designed based on literature recommendations. On the designed Venturi tube, two-dimensional numerical simulations were investigated by the means of CFD computations using the commercial software package, Ansys Fluent. The resulting cavitation bubbles were analysed at different inlet pressures.

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“…Shi et al [34] established a semi-empirical model to predict cavitation in different venturi injectors. Furthermore, Dastane et al [35] developed a CFD modeling scheme to successfully simulate flows in a cavitating venturi. Various study reports on venturi injectors revealed that CFD methods have been used extensively to investigate the impact of key structure and working parameters on the performance, including the diffusion, shape of the nozzle, ratio of the throat length to diameter, and contraction ratio [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study on the Internal Flow of the Venturi Injector

Huang

et al. 2020

Processes

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To study the appropriate numerical simulation methods for venturi injectors, including the investigation of the hydraulic performance, mixing process, and the flowing law of the two internal fluids, simulations and experiments were conducted in this study. In the simulations part, the cavitation model based on the standard k–ε turbulence and mixture models was added, after convergence of the calculations. The results revealed that the cavitation model has good agreement with the experiment. However, huge deviations occurred between the experimental results and the ones from the calculation when not considering the cavitation model after cavitation. Thus, it is inferred that the cavitation model can exactly predict the hydraulic performance of a venturi injector. In addition, the cavitation is a crucial factor affecting the hydraulic performance of a venturi injector. The cavitation can ensure the stability of the fertilizer absorption of the venturi injector and can realize the precise control of fertilization by the venturi injector, although it affects the flow stability and causes energy loss. Moreover, this study found that the mixing chamber and throat are the main areas of energy loss. Furthermore, we observed that the internal flow of the venturi injector results in the majority of mixing taking place at the diffusion and outlet sections.

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Single and multiphase CFD simulations for designing cavitating venturi

Cited by 36 publications

References 29 publications

Experimental and numerical investigation of geometric effect on cavitation flow through orifice

Experimental and numerical investigation of geometric effect on cavitation flow through orifice

Modelling of hydrodynamic cavitation for treatment of wastewater in a Venturi tube

Numerical and Experimental Study on the Internal Flow of the Venturi Injector

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