Dynamics of the cavitating flow downstream of the orifice plate

Rudolf, Pavel; Kubina, Dávid; Kozák, Jiří; Hudec, Martin; Pochylý, František

doi:10.1063/1.5004367

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…The purpose of the work is to develop a scientifically based method for calculating the effective ranges of the design parameters of the throttle part of the axial valve. Currently, the design of equipment (Hou et al, 2017;Qiu et al, 2019) subject to the effect of cavitation, as a rule, is based on the active use of ready-made software products (Tang et al, 2019), and as a result, has a numerical representation of the results (Rudolf et al, 2017) of their application in graphical or tabular form. Visualization of the studied process (Qu et al, 2015), performed by this method, has a high degree of visibility for a particular device, however, this requires the preliminary implementation of labor-intensive experimental validation (Qu et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

“…Regarding the methods for calculating the effective ranges of the design parameters of control valves, two approaches are most widespread: analytical estimation (Arzumanov, 1971(Arzumanov, , 1985Blagov, 1990) using the Pi-Buckingham theorem (Buckingham, 1915;Misic et al, 2010) or numerical modeling for gaseous (Bian et al, 2019a,b;Cao and Bian, 2019) and liquid (Qu et al, 2015;Hou et al, 2017;Rudolf et al, 2017;Qiu et al, 2019;Tang et al, 2019) environments using ready-made software products (Ansys Inc, 2013. Moreover, the first approach requires a wide experimental base, and the second requires a long adaptation of the software product to the main factors influencing the course of the studied processes, including cavitation (Knapp et al, 1970;Franc and Michel, 2005;Xu et al, 2015), in a specific design.…”

Section: Introductionmentioning

confidence: 99%

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Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

et al. 2020

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The purpose of the work is to develop an analytical method for calculating the effective ranges of structural parameters of the throttle part of the axial valve with the external location of the locking shell based on the proposed stochastic models of bubble formation at the initial stage of hydrodynamic cavitation. In contrast to the well-known engineering methods for choosing the conditional bore diameter for the designed control device constructed using the Pi-Buckingham theorem, this calculation method relies not only on gyrodynamic similarity criteria, but also on functional dependences for the laws of distribution of cavitation bubbles according to various characteristics (specific size bubbles, the degree of opening of the node "separator-external locking shell"). This takes into account a wide range of design and operating parameters, including the required valve capacity, as well as the physical and mechanical characteristics of the working medium. A block diagram of the calculation of the node "separator-external locking shell" for the specified axial valve is proposed. The influence of a set of design parameters for the "separator-external locking shell" assembly from the rational ranges of their variation obtained using the proposed analytical calculation algorithm on the size of cavitation bubbles is investigated. It has been established that when using the latest results in comparison with the values of parameters from irrational ranges of change, there is a tendency to reduce the ensemble average value of the diameter of the cavitation bubble by 1.95 times, when switching to a mode from 20% of the degree of separation of the separator to 80% of the opening of the throttle holes, the nominal valve capacity increases by 10.7 times. The results obtained illustrate the possibility of preventing an increase in the intensity of formation of cavities in the flow part of the control device already at the initial stage of the occurrence of cavitation.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

et al. 2020

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“…Novi oblici mernih blendi su ispitivani u laboratorijskim uslovima [3][4][5][6][7]. Rezultati tih ispitivanja su poređeni sa rezultatima prethodnih istraživanja ili su postavljani matematički modeli, koji su zatim poređeni sa eksperimentalnim rezultatima [8][9][10][11][12][13][14]. Rešavanje sistema diferencijalnih jedačina, koje je bilo neophodno rešiti da bi se rešili ovi matematički modeli, bio je dug i mukotrpan proces.…”

Section: Slika 1 Profil Apsolutnog Statičkog Pritiska Fluida Na Zid unclassified

Analysis of new forms of orifice plates using computational fluid dynamics

Halas

Bera

Omorjan

et al. 2019

Hem Ind

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Izvod U mnogim granama tehnike javljaju se problemi merenja protoka fluida. Merne blende, zbog svojih mnogih prednosti predstavljaju najzastupljeniji instrument za merenje protoka fluida kroz cevovode. Sa druge strane njihova upotreba povećava troškove rada industrijskih postrojenja i cevovoda. U ovom radu dizajnirana su i ispitana tri nova oblika mernih blendi. Njihov cilj je bio ušteda energije, a samim tim i smanjenje troškova rada. Novi oblici mernih blendi, kao i jedna standardnog oblika koja je poslužila kao referentna, dizajnirani su u programskom paketu SolidWorks. Ušteda energije je postignuta dizajnom koji smanjuje otpor merne blende kao elementa cevovoda. Zatim su, prema predloženom algoritmu, dizajnirani oblici ispitani pomoću simulacije računarske dinamike fluida (RDF) u programskom paketu COMSOL Multiphysics i primenom tehnologije 3D štampanja, FDM postupkom (eng. Fused Deposition Modeling), izrađeni i ispitani u laboratorijskim uslovima. Rezultati laboratorijskih ispitivanja su prikazani uporedo sa rezultatima RDF simulacije. Dobijeni rezultati pokazuju znatan efekat uštede energije. Utvrđeno je da se pomoću RDF simulacije mogu dobiti podaci na osnovu kojih se može doneti odluka da li novi oblik merne blende treba korigovati ili ima smisla pristupiti laboratorijskom ispitivanju.

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“…Ji et al [9] studied the effect of the upstream pressure and cavitation number of multi-holes orifice using experimentally and numerically methods. Rudolf et al [10] studied the static and dynamic characteristic of multi-hole orifices carrying out experiments. By now, the circular holes, rectangular holes, and triangular holes of orifice plates have been discussed relatively by researchers, but a comparison of different shape of holes and different arrangement of these holes have barely been done.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Cavitation Inside Sharp-Edged Multi-Hole Orifice Plate

Гао¹,

Qian²,

Jin³

2018

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

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Cavitation can be useful in many occasions, for example, it can be adopted to improve the mass and heat transfer of the solution and it can also be used during the wastewater treatment. Among the ways to generate cavitation in hydrodynamic devices, the sharp-edged orifice is often used because it has a simple structure and the tube that has multi-holes orifice plate is more likely to generate cavitation. In this paper, experiment and computational fluid dynamic (CFD) method are carried out, the flux of the test tube is recorded during the experimental process, and the cavitation model used in the numerical study is validated by comparing the simulated results with the experimental results, then triangular, rectangular, and circular shape of holes and different kinds of distributions of holes such as circular and rectangular distributions are numerically studied. The vapor volume fraction is visualized to find out the effects of holes shape and arrangement on cavitation intensity. Besides, study focusing on the inlet pressure is achieved using CFD simulations, and the cavitation number is calculated under different cases to find out their effects on cavitation intensity. It can be concluded from the obtained results that cavitation number decreases with the increase of pressure drop, and under a certain value of pressure drop, the orifice plates with circular holes have the minimal cavitation number and maximal cavitation intensity. When the holes are circular arrangement, the orifice plates with circular and triangular holes has higher cavitation intensity, and when inlet pressure is large enough, different arrangement and shape of holes barely affect the cavitation intensity.

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Dynamics of the cavitating flow downstream of the orifice plate

Cited by 9 publications

References 13 publications

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

Engineering Method for Calculating of an Axial Valve Separator With an External Location of the Locking Part

Analysis of new forms of orifice plates using computational fluid dynamics

Experimental and Numerical Study of Cavitation Inside Sharp-Edged Multi-Hole Orifice Plate

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