-The PVDF-ST-1-P type hydrophone can be used as a standard hydrophone in the frequency range from 100kHz to 1MHz with an average sensitivity of -204dB and a fluctuation of ±1.5dB. It has been used satisfactorily in the measurement of the noise spectra of cavitations with a rushing stream of 50 m/a in velocity.
A nano-H_(0.10)WO_3·1.06H_2O with microporous and thin lamella is gained passing through cavitations in ultrasonic-centrifuging 7 times. Its specific surface area is 26.16 m~2·g~(-1) and cexpands to 2.4 times large as the one which is ultrasonicd-centrifuged once and the diffuse reflectance spectra can shift to wavelength of 480 nm .
Based on hydromechanics computation knowledge, taking commercial CFD software Fluent as tool, using Realizable κ-ε two equations model of Reynolds averaged method and mixed multiphase flow model, cavitations in an impeller of a low specific speed centrifugal pump and an runner of a francis turbine are simulated.
nuclei with chromatin condensation,fragmentation and lysis alterations were seen in the middle region between the needles; concentric circles changed into ellipse fusiform and finally overlaped each other forming irregular necrosis contours. Cell cavitation and tissues ischemia were also observed within electric field.
The cavitation erosion damage process of dynamically loaded journal bearings
The cavitation damage model was built using finite element analysis software MSC.Marc.
This paper attempted to numerically analyze the action process based on damage mechanics when a jet created by bubble collapse acted on the bearing surface in the process of cavitation erosion.
The strain history and damage evolvement of bearing material acted on by jet impact load can be calculated efficiently using the proposed method, which develops a new method of analyzing cavitation erosion failure of the bearing surface.
Based on the variational constraint approach, the variational form of Reynolds equation in hydrodynamic lubrication is revised continuously to satisfy certain constraints in the cavitation zone of oil film field.
Research on the method of cavitations resistance in a piezoelectric pump with 3-dimensional mesh structure
However, when the pump is working, it produces cavitations and the air bubbles that originate from these will flow out of the pump.
Cavitations occurring in the pump will bring out noise and shorten the life of the pump.
This paper discusses the flowing process inside a nozzle, especially the formation mechanism of cavitations within the nozzle and puts forward a nozzle flow model, which takes account of the injection conditions and nozzle geometry.
The comparisons between the computational and experimental results are performed, which show that the liquid spray characteristics could be more truly demonstrated by considering the existence of the cavitations.