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Cavitation - DOAJ

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Last Updated: 10 September 2022

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Multi-objective analysis design of spiral groove conical bearing considering cavitation effects

As an integral part of rotary motion, the investigation of hydrodynamic behavior for spiral groove conical bearing is closely linked to multibody systems and SGCB's lubrication results are of utmost concern. The hydrodynamic behavior of SGCB is estimated with a multiphase flow model accounting for phase transition process and cavitation phenomenon, taking into account the cavitation effects.

Source link: https://doi.org/10.1016/j.rineng.2022.100582


Numerical Simulation of Axial-Flow Pump Cavitation Based on Variable Frequency Speed Regulation

The cavitation results of an axial-flow pump were investigated under different VVVF conditions in order to determine the effect of variable voltage and variable frequency control on the cavitation results of the axial-flow pump's cavitation results. The change of direction was stable, and the rise of the cavity volume of the two different acceleration schemes was faster than that of the uniform acceleration scheme. It was discovered that the three acceleration schemes all have high pressure fluctuation under VVVF by investigating the effect of cavitation on pressure distribution under VVVF. The pressure fluctuation amplitude increased in the late stage of acceleration as the pressure decline rate accelerated, contributing to the acceleration scheme with higher acceleration.

Source link: https://doi.org/10.3390/w14172757


Characteristics of Cavitation Flow for a Regulating Valve Based on Entropy Production Theory

entropy production theory is used to analyze the flow field in the regulating valve numerically in order to perform a quantitative analysis of the energy loss in the cavitation flow and determine the magnitude and location of the hydraulic leak in the flow field more accurately. The entropy production rate is primarily distributed at the orifice and downstream of the regulating valve, the entropy production rate hits its highest value at the orifice, and turbulent pulsation entropy production is the largest component of the total entropy production for flow. In addition, an exponential distribution can be used to determine the relationship between total entropy production and steady-state flow forces. When the steady-state flow force increases, total entropy production for flow increases.

Source link: https://doi.org/10.3390/en15176480


Effect of Tip Clearance on the Cavitation Flow in a Shunt Blade Inducer

An external characteristics experiment of a centrifugal pump with a shunt blade inducer was carried out in order to investigate the effect of tip clearance on a shunt blade inducer's internal cavitation stability. The effect of tip clearance on the cavitating flow in a shunt inducer was investigated and analysed. Tip clearance has a major effect on the pressure drop on a shunt blade inducer's inducer. The findings revealed that tip clearance had a significant effect on the cavitation of a shunt blade inducer under low flow rate conditions.

Source link: https://doi.org/10.3390/en15176330


Investigation of the cavitation processes behind a cylinder located in a microchannel in a wide range of Reynolds numbers

Using the LES model, the Zwartu2013Gerberu2013Belamri cavitation model was used to simulate cavitation processes, and turbulence was simulated using the Zwart u2013Gerber model. The channel inlet pressure varied from 2 to 30 bar. Stable developed cavitation was discovered for inlet pressures above 18 bar, but no cavitation was observed for inlet pressures below 8 bar as reported by experimental studies. The cavitation pulsation frequency and hydrodynamic pulsation frequency values were determined. Dependence of the relative drag coefficient on the inlet pressure, which was well approximated by a correlation u03b6r = 0. 5, was determined.

Source link: https://doi.org/10.1016/j.csite.2022.102306


Removal of single and dual ring thiophene’s from dodecane using cavitation based processes

Low-capacity acoustic cavitation has been used for almost two decades, with recent studies ranging from low-capacity cavitation to scalable hydrodynamic cavitation. Investigations into single and dual ring thiophene removal from dodecane were carried out during the first phase of this project. HC was demonstrated to be able to remove single ring thiophene from dodecane without using any external catalyst or additives. However, in the absence of catalyst or additives, it was not possible to remove dual ring thiophenes such as dibenzothiophene using HC. The effects of using oxidant and carboxylic acid catalysts on the efficacy of removal of dual ring thiophenes is discussed. Using AC, regeneration of extractant that accumulates oxidised sulphur species from dodecane was also investigated. Increasing desulphurization results can be aided by the additives and process conditions described in this study.

Source link: https://doi.org/10.1016/j.ultsonch.2022.106148


Intensification of Red-G dye degradation used in the dyeing of alpaca wool by advanced oxidation processes assisted by hydrodynamic cavitation

Red-G dye is one of the most popular dyes used in the textile industry to dye alpaca wool, and it is one of the main dyes used in the textile industry. In HC-system at pH 2, where the percentage of dye degradation increased at lower temperatures grew at lower temperatures, the effect of temperature was also investigated. Then, 50. 7 percent of dye was removed under optimized conditions of the HC-assisted Fenton process, was greatly enhanced by UV-light incorporation in the HC-system, raising the target to 99 percent removal success with respect to the HC-assisted Fenton process and reducing the time to 15 minutes, with respect to HC-assisted Fenton process's optimized condition.

Source link: https://doi.org/10.1016/j.ultsonch.2022.106144


Bayesian Inference of Cavitation Model Coefficients and Uncertainty Quantification of a Venturi Flow Simulation

Uncertainty quantification of a venturi tube simulation with the cavitating flow is conducted in the present work, based on Bayesian inference and point-collocation nonintrusive polynomial chaos based on Bayesian inference and point-collocation nonintrusive polynomial chaos. The simulation results, which include void fractions and velocity profiles, are validated with experimental results, using a Zwart/u2013Belamri cavitation model and RNG k-u03b5 turbulence model to simulate the cavitating flow in the venturi tube using ANSYS Fluent. The ZGB cavitation model coefficients are calibrated with an experimental void fraction as experiment results, and posterior distributions of the four model coefficients are obtained using MCMC. It has been reported that the wall roughness with a Sobol index of 0. 72 has a greater effect on the cavitating flow simulation's uncertainty than the inlet velocity of 0. 52.

Source link: https://doi.org/10.3390/en15124204


Cavitation assisted endoplasmic reticulum targeted sonodynamic droplets to enhanced anti-PD-L1 immunotherapy in pancreatic cancer

Abstract Background Sonodynamic therapy results in immunogenic cell death in tumors and promises to play a key role in pancreatic cancer immunotherapy. The tumor vascular endothelial cells were first found around the tumor vascular endothelial cells after intravenous injection. The modified sonosensitizer can rapidly accumulate in the ER to produce a substantial amount of ROS in situ, inducing potent ER stress, enhanced ICD, and dendritic cell maturation in vitro and in vivo. In addition, the elevated antitumor activity of SDT plus anti-PD-L1 immunotherapy was established using an orthotopic tumor model. Conclusions This research shows that a cavitation-assisted ER targeted sonodynamic therapy can improve the effectiveness of anti-PD-L1 immunotherapy in orthotopic and distant pancreatic cancer.

Source link: https://doi.org/10.1186/s12951-022-01459-w


Accuracy Assessment of RANS Predictions of Active Flow Control for Hydrofoil Cavitation

In addition, the effects of wall injection on both the cavitation and the guide vane's hydrodynamic results are investigated. The current numerical results for the 3 u2218 angle of attack are in good agreement with previous experimental results, but flow separation hinders the simulations from accurately capturing the flow properly.

Source link: https://doi.org/10.3390/pr8060677

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions