dc.contributor	Sedlář Milan, RNDr. CSc. : 65631
dc.contributor.advisor	Müller Miloš, Ing. Ph.D. : 55450
dc.contributor.author	Džomba, Amila
dc.date.accessioned	2021-08-20T12:09:21Z
dc.date.available	2021-08-20T12:09:21Z
dc.date.committed	2022-4-30
dc.date.defense	2021-06-22
dc.date.submitted	2020-11-1
dc.date.updated	2021-6-22
dc.degree.level	Ing.
dc.description.abstract	The introduction to cavitation and its effects is described at the beginning of this study, as well as properties of fluid that affects cavitation and mechanisms of cavitation bubble collapse. Research on models which are used for cavitation aggressiveness and cavitation erosion description are studied. Further, description of material response to cavitating flow impacts with description of cavitation erosion is presented. Main stages, incubation, acceleration and steady state period, of cavitation are briefly described and focus is set on steady state period of cavitation. Existing pitting tests and impact forces measurements are taken into consideration and are utilized in this study. Experiment on vibratory apparatus is conducted in order to obtain mass loss data and erosion rate curve, as well as cumulative mass loss curve. Mass loss is measured until the steady state period of cavitation is reached since steady state period is the one of interest in this study. Results of the experiment are presented in the form of erosion rate graph and cumulative mass loss curve, since these are characteristic curves which describe cavitation erosion stages. Experimentally obtained erosion rate curve is compared to theoretical erosion rate curve and it is proven to be similar. Phenomenological model for cavitation erosion rate computation is studied and erosion tests are used in validation of the model. Applicability of the model on available experimental data is studied and results are presented. Results of experimental and analytical methods are compared and proven to be similar, of the same order. Conclusion is made that the experiments conducted in a couple of minutes are sufficient and there is a possibility to predict erosion rate based on these relatively simple experiments.	cs
dc.description.abstract	The introduction to cavitation and its effects is described at the beginning of this study, as well as properties of fluid that affects cavitation and mechanisms of cavitation bubble collapse. Research on models which are used for cavitation aggressiveness and cavitation erosion description are studied. Further, description of material response to cavitating flow impacts with description of cavitation erosion is presented. Main stages, incubation, acceleration and steady state period, of cavitation are briefly described and focus is set on steady state period of cavitation. Existing pitting tests and impact forces measurements are taken into consideration and are utilized in this study. Experiment on vibratory apparatus is conducted in order to obtain mass loss data and erosion rate curve, as well as cumulative mass loss curve. Mass loss is measured until the steady state period of cavitation is reached since steady state period is the one of interest in this study. Results of the experiment are presented in the form of erosion rate graph and cumulative mass loss curve, since these are characteristic curves which describe cavitation erosion stages. Experimentally obtained erosion rate curve is compared to theoretical erosion rate curve and it is proven to be similar. Phenomenological model for cavitation erosion rate computation is studied and erosion tests are used in validation of the model. Applicability of the model on available experimental data is studied and results are presented. Results of experimental and analytical methods are compared and proven to be similar, of the same order. Conclusion is made that the experiments conducted in a couple of minutes are sufficient and there is a possibility to predict erosion rate based on these relatively simple experiments.	en
dc.description.mark
dc.format	66p. (77 556 characters)
dc.format.extent	Ilustrace, Grafy, Tabulky -
dc.identifier.signature	V 202103229
dc.identifier.uri	https://dspace.tul.cz/handle/15240/160762
dc.language.iso	an
dc.relation.isbasedon	parFRANC, Jean-Pierre a Jean-Marie MICHEL. Fundamentals of cavitation. Dordrecht: Kluwer Academic Publishers, [2004]. Fluid mechanics and its applications, volume 76. ISBN 1-4020-2232-8.par parBRENNEN, Christopher E. Cavitation and bubble dynamics. New York: Cambridge University Press, 2014. ISBN 9781107644762.par parKim, K. H., Chahine, G., Franc, J.-P. & Karimi, A. (2014) Advanced experimental and numerical techniques for cavitation erosion prediction. Dordrecht, Springer.par
dc.rights	Vysokoškolská závěrečná práce je autorské dílo chráněné dle zákona č. 121/2000 Sb., autorský zákon, ve znění pozdějších předpisů. Je možné pořizovat z něj na své náklady a pro svoji osobní potřebu výpisy, opisy a rozmnoženiny. Jeho využití musí být v souladu s autorským zákonem https://www.mkcr.cz/assets/autorske-pravo/01-3982006.pdf a citační etikou https://knihovna.tul.cz/document/26	cs
dc.rights	A university thesis is a work protected by the Copyright Act. Extracts, copies and transcripts of the thesis are allowed for personal use only and at one?s own expense. The use of thesis should be in compliance with the Copyright Act. https://www.mkcr.cz/assets/autorske-pravo/01-3982006.pdf and the citation ethics https://knihovna.tul.cz/document/26	en
dc.rights.uri	https://knihovna.tul.cz/document/26
dc.rights.uri	https://www.mkcr.cz/assets/autorske-pravo/01-3982006.pdf
dc.subject	cavitation aggressiveness	cs
dc.subject	cavitation erosion	cs
dc.subject	phenomenological model	cs
dc.subject	erosion rate	cs
dc.subject	steady state period of cavitation	cs
dc.subject	cavitation aggressiveness	en
dc.subject	cavitation erosion	en
dc.subject	phenomenological model	en
dc.subject	erosion rate	en
dc.subject	steady state period of cavitation	en
dc.title	Models for the prediction of cavitation aggressiveness	cs
dc.title	Models for the prediction of cavitation aggressiveness	en
dc.type	diplomová práce	cs
local.degree.abbreviation	Navazující
local.degree.discipline	KSA
local.degree.programme	Mechanical Engineering
local.degree.programmeabbreviation	N2301
local.department.abbreviation	KEZ
local.faculty	Fakulta strojní	cs
local.faculty.abbreviation	FS
local.identifier.author	S19000377
local.identifier.stag	41787
local.identifier.verbis
local.identifier.verbis	3a051535-1e9d-4575-8334-6f582da57cb5
local.note.administrators	automat
local.note.secrecy	Povoleno ZverejnitPraci Povoleno ZverejnitPosudky
local.poradovecislo	3229

Models for the prediction of cavitation aggressiveness

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