Experimental investigation of hydrodynamic cavitation through orifices of different geometries

Rudolf, Pavel; Kubina, Dávid; Hudec, Martin; Kozák, Jiří; Maršálek, Blahoslav; Maršálková, Eliška; Pochylý, František

doi:10.1051/epjconf/201714302098

Cited by 19 publications

(8 citation statements)

References 9 publications

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“…Standard orifices have one circular hole with prescribed thickness/diameter ratio and shape of the orifice edge. In our previous research [3,4], it was found out that pressure amplitudes downstream of both one-hole and multihole orifices are lower than those generated by Venturi tube.…”

Section: Introductionmentioning

confidence: 88%

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Cavitation in Fractal Geometry Orifices

Rudolf¹,

Kubina²,

Hudec³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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An experimental research of three types of orifices was carried out in a hydraulic circuit. One-hole orifice and two fractal-shaped orifices (von Koch snowflake, Apollonian gasket) were tested. Fractalshaped orifices had lower pressure loss in non-cavitating regime. For cavitating conditions, von Koch snowflake orifice maintained the reduced pressure loss, while pressure loss curve within Apollonian gasket orifice gradually aligned with that of one-hole orifice. Dynamics of the cavitating flow behind the orifices featured distinct peak for one-hole orifice connected with shedding of one strong coherent vortical structure, while pressure amplitudes for fractal-shaped orifices (especially von Koch snowflake orifice) were significantly lower. This conclusion is attributed to multiscale behavior of the flow behind the fractal-shaped orifices.

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Section: Introductionmentioning

confidence: 88%

“…While one-hole orifices are mostly used in practice, investigations have also been carried out on multihole orifices [2,4]. It was proved that they can achieve lower pressure loss across the orifice.…”

Section: Fractal Geometrymentioning

confidence: 99%

Cavitation in Fractal Geometry Orifices

Rudolf¹,

Kubina²,

Hudec³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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“…In paper [6], the influence of the shape of the hydrodynamic channels on the course of the cavitation process was investigated. The substantiation of choice, calculation of the optimum cross-section of the hydroline was proposed.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Examining a cavitation heat generator and the control method over the efficiency of its operation

Ved

Nikolsky

Oliynyk

et al. 2017

EEJET

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“…Their experimental results illustrated that using multi-hole orifices was more effective than single-hole orifices due to their low energy dissipation. Moreover, based on their study, multi-hole orifices lead to a significant drop of loss coefficient in cavitating and non-cavitating regimes [14]. Dong et al experimentally studied the effects of number, arrangement, and ratio of the holes in an orifice plate.…”

Section: Introductionmentioning

confidence: 99%

Engineered Lateral Roughness Element Implementation and Working Fluid Alteration to Intensify Hydrodynamic Cavitating Flows on a Chip for Energy Harvesting

et al. 2019

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Hydrodynamic cavitation is considered an effective tool to be used in different applications, such as surface cleaning, ones in the food industry, energy harvesting, water treatment, biomedical applications, and heat transfer enhancement. Thus, both characterization and intensification of cavitation phenomenon are of great importance. This study involves design and optimization of cavitation on chip devices by utilizing wall roughness elements and working fluid alteration. Seven different microfluidic devices were fabricated and tested. In order to harvest more energy from cavitating flows, different roughness elements were used to decrease the inlet pressure (input to the system), at which cavitation inception occurs. The implemented wall roughness elements were engineered structures in the shape of equilateral triangles embedded in the design of the microfluidic devices. The cavitation phenomena were also studied using ethanol as the working fluid, so that the fluid behavior differences in the tested cavitation on chip devices were explained and compared. The employment of the wall roughness elements was an effective approach to optimize the performances of the devices. The experimental results exhibited entirely different flow patterns for ethanol compared to water, which suggests the dominant effect of the surface tension on hydrodynamic cavitation in microfluidic channels.

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Experimental investigation of hydrodynamic cavitation through orifices of different geometries

Cited by 19 publications

References 9 publications

Cavitation in Fractal Geometry Orifices

Cavitation in Fractal Geometry Orifices

Examining a cavitation heat generator and the control method over the efficiency of its operation

Engineered Lateral Roughness Element Implementation and Working Fluid Alteration to Intensify Hydrodynamic Cavitating Flows on a Chip for Energy Harvesting

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