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Cavitation - Springer Nature

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Last Updated: 10 September 2022

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Cavitation Detection of Centrifugal Pumps Using SVM and Statistical Features

Centrifugal pump is a form of pump that is widely used in industry. Pattern recognition-based fault detection and classification have gained traction among many researchers recently due to its superior detection and classification results. Support vector machine is one of the pattern recognition methods that requires statistical information as input for building the model. In this study, ten statistical characteristics are extracted from the time-domain vibration signal and selected using Relief Feature Selection. The Bayesian Optimization algorithm and Grid Search Method are both optimized for each multi-class classification task. Variability, root mean square, and standard deviation are the best feature to use for SVM classification, according to the feature selection process. With an accuracy of 99%, the binary SVM method provides the best perspective on early cavitation with the highest probability. With an overall accuracy of 100%, the Bayesian optimization algorithm with multi-class SVM is the most accurate way to classify all pump conditions.

Source link: https://doi.org/10.1007/978-981-19-0867-5_1


Effect of Pipe-End Material on Water Hammer and Cavitation in Viscoelastic Pipelines

The classical model can be used to predict hammer in viscoelastic pipelines. This paper discusses how to solve numerical problems of water hammer and cavitation in viscoelastic pipelines by involving the pipe-end rigidity in boundary conditions. Fluid transient in both downstream and upstream-valve HDPE straight pipe, which are rigidly fixed, is determined by a method of characteristics. Both cavitating and non-cavitating flows are used in this classical viscoelastic simulation. Two forms of pipe-end material are compared in the United States: the rigid end and the viscoelastic end.

Source link: https://doi.org/10.1007/978-3-031-14615-2_18


Modeling C-S-H Sorption at the Molecular Scale: Effective Interactions, Stability, and Cavitation

The behavior of confined water molecules in C-S-H gel has a major effect on various physical and chemical characteristics of the C-S-H gel, which can further influence the macroscale behavior of cement-based materials such as creep, shrinkage, and cracking. Here, we investigate the effect of relative humidity on C-H's behavior at the molecular scale, taking into account the reaction path the interlayer distance. We can determine equilibrium basal spacings and meta-stable domains from the PMF's profiles and pressure isotherms. As the RH decreases, stable basal spacing decreases, resulting in cement-based materials drying shrinkage. We also show that water cavitation in small C-S-H interlayer spaces is pore size dependent. Each of these properties may help to describe the chemical origins of cement-based materials' thermo-hygro-mechanical behavior and provide a method to optimize their results.

Source link: https://doi.org/10.1007/978-3-031-07746-3_22


Vitrectomy for macular retinoschisis associated with peripapillary intrachoroidal cavitations in a moderately myopic eye

Peripapillary intrachoroidal cavitation, a drastic change in the peripapillary choroid's peripapillary choroid, may cause macular lesions. We have found unusual occurrence of PICC with an outer lamellar macular hole and macular retinoschisis here. Case study A 69-year-old man was diagnosed with metamorphopsia in the left eye. The Pars plana vitrectomy with fovea sparing internal limit membrane peeling was carried out. The macular retinoschisis problem was not resolved without macular hole formation, but the patient's visual acuity improved, and macular retinoschisis was minimized. Vitrectomy with FSIP may be able to resolve macular retinoschisis.

Source link: https://doi.org/10.1186/s40942-022-00409-w


Effect of pressure and time on bioactive content, PPO inactivation, physicochemical and sensory properties of aonla (Emblica officinalis) juice during hydrodynamic cavitation processing

Aonla juice treated with hydrodynamic cavitation at a pressure range of 5 to 30 min was evaluated for physical and nutritional characteristics. For three min, thermally treated samples inactivated 100% of PPO at 95. u2103, however, there was evidence of a dark color with a browning index value of 67. 38. The retention of various bioactives in thermally treated juice samples was less than that of HC-treated samples.

Source link: https://doi.org/10.1007/s10068-022-01164-2


Investigation of the effect of propeller flexibility on cavitation formation and hydrodynamic coefficients

To simulate the cavitation flow around the propeller, flow is considered as a homogeneous mixture, and Zwartu2013Belamriu2019's cavitation model was used. The validation of cavitation flow around the E779a propeller was carried out, and considering the comparison of experimental and numerical results, there is a good match between thrust, torque coefficients, and volume of cavity. The results show that uniform flow, shifts in rake angle have no effect on rigid propellers' results, while flexible propellers' hydrodynamic loads would cause bending and twisting deformations of the blade.

Source link: https://doi.org/10.1007/s00773-022-00892-8


Elimination of cavitation induced vibrations in orifice plates

Increased cavitation in a pipe system is attributed to increased levels of noise or noise, as well as vibrations. If steam bubbles implode near the pipe wall, it could result in heavy loads and can be dangerous to the pipe system. It has been experimentally proven that replacing a traditional orifice plate in a sequence with three stages of multi-hole orifice plates in series with only a total streamwise distance of two pipe diameters, resulting in no loss of strong cavitation. The cavitation-induced vibration levels have been reduced by nearly 5 percent. The same findings were obtained for experiments using u03b2 = 0. 30 and 0. 40. Quantification of the vibration levels, how they vary from the type of orifice plates, and how they scale with the dynamic pressure is the most important contribution.

Source link: https://doi.org/10.1007/s42757-021-0114-6


Transesterification of Sunflower Oil in the Presence of the Cosolvent Assisted by Hydrodynamic Cavitation

Following the rise of TC = 0 to TC = 89 percent, TC = 98%; maximum TC = 89 percent was achieved at M_1 = 90; maximum TC = 98. 1% - 9. 0%? 170 percent TC = 98%; maximum TC = 98%; and calibration yield decreases from TC = 91 to CY = 0. 58 g/J; maximum TC = 89. 8% was achieved at M_1 = TC = t TC = TC = TC = t = TC = 68 to TC = TC = TC = TC = TC = TC = 98; TC = TC = TC = TC = TC = TC = TC = 89 TC = TC = TC = TC = 0 TC = TC = TC = % 0. 96 t = 613 t = 00b0 % 59. t = 99%; maximum (0) = t = 00b0; 0 % g/J % 58.

Source link: https://doi.org/10.1007/s12155-021-10387-w


Effects of pulse duration on laser-induced crystallization of urea from 300 to 1200 fs: impact of cavitation bubbles on crystal nucleation

The relationship of pulse duration on crystal nucleation of urea caused by laser ablation of liquid was investigated. In this research, laser pulse irradiation with laser pulses of all duration conditions could cause the crystallization of the laser focus, which allowed for the systematic analysis of the likelihood of laser-induced crystallization. We also carried out the microsecond-scale laser ablation of urea solutions to investigate the spatial and temporal characteristics of generation, expansion, and the destruction of cavitation bubbles caused by laser ablation, which can be one of the key catalysts of crystal nucleation.

Source link: https://doi.org/10.1007/s00339-022-05909-y


Ultrasonic cavitation bubble- and gas bubble-assisted fractional precipitation for the purification of (+)-dihydromyricetin

This research explores the ultrasonic cavitation bubble- and gas bubble-assisted fractional precipitation that drastically raises the precipitation rate in the new precipitation system for purifying -dihydromyricetin. The precipitation rate steady was increased by 11. 0,55. 0 times and 17. 0u201324. 6 times, resulting in reduced precipitation rate, which resulted in a reduced precipitation rate.

Source link: https://doi.org/10.1007/s11814-022-1202-4

* 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