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Title:
Experimental analysis of cavitation erosion in a particle-laden flow
Authors:
ID
Jovanovski, Filip
(Author)
ID
Biluš, Ignacijo
(Mentor)
More about this mentor...
ID
Zdolšek, Daniel
(Mentor)
More about this mentor...
ID
Kevorkijan, Luka
(Comentor)
Files:
UN_Jovanovski_Filip_2023.pdf
(3,93 MB)
MD5: 962DFAD17CEE82FA6ED3C010A13F967F
Language:
English
Work type:
Bachelor thesis/paper
Typology:
2.11 - Undergraduate Thesis
Organization:
FS - Faculty of Mechanical Engineering
Abstract:
Cavitation erosion is a problem that presents a challenge for the engineers in different industries, as it erodes the machinery which leads to lower efficiency and higher maintanance costs. An experimental investigation has been conducted to evaluate cavitation and cavitation erosion with and without the presence of solid particles in a Venturi channel. The methodology is based on observing and analysing the evolution of the vapour structures and occurence of cavitation erosion on the sample surface in the Venturi channel. To conduct experiments the cavitation tunnel was used, with the central component being a transparent test section with a Venturi-like channel (constructed from Plexiglass walls and a metal insert) to monitor the process of cavitation. To detect the damage caused by cavitation erosion and abrasion, the most effective solution was found to be an indicator in the form of black acrylic paint thinned with water (at a ratio of 1:2). On the sample surface, a self-adhesive aluminium tape was applied to protect the aluminium base from erosive characteristics from cavitation Furthermore, a comparison between cavitation with and without solid particles was made to determine the effects of solid particles on both cavitation and abrasion of the sample surface. The observation revealed that no matter the solid particles, damage from cavitation erosion appears at the separation point and in proximity to the location of the detached cloud collapse. The spherical glass particles with diameters between 40 µm and 70 µm added an abrasive effect on the sample surface only in the presence of cavitation structures. It was determined, that the intensity of cavitation erosion and abrasion increases when the cavitation number decreases and volumetric flow rate increases. Also, an economic analysis was conducted, to determine which is the more cost beneficial solution between replacement of the metal insert and application of protective coatings over the metal insert.
Keywords:
cavitation erosion
,
solid particles
,
abrasion
,
experiment
Place of publishing:
Maribor
Place of performance:
Maribor
Publisher:
[F. Jovanovski]
Year of publishing:
2023
Number of pages:
1 spletni vir (1 datoteka PDF (XI, 56 f.))
PID:
20.500.12556/DKUM-85353
UDC:
620.193.16(043.2)
COBISS.SI-ID:
189296131
Publication date in DKUM:
28.02.2024
Views:
230
Downloads:
29
Metadata:
Categories:
KTFMB - FS
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JOVANOVSKI, Filip, 2023,
Experimental analysis of cavitation erosion in a particle-laden flow
[online]. Bachelor’s thesis. Maribor : F. Jovanovski. [Accessed 21 January 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=85353
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Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:
28.08.2023
Secondary language
Language:
Slovenian
Title:
Eksperimentalna analiza kavitacijske erozije v toku kapljevine s trdimi delci
Abstract:
Kavitacijska erozija je izziv za inženirje v različnih industrijah, saj povzroča erozijo strojev, kar vodi do manjše učinkovitosti in višjih stroškov vzdrževanja. Izvedena je bila eksperimentalna analiza kavitacijske erozije v toku kapljevine s trdnimi delci v Venturijevem kanalu in brez njih. Metodologija temelji na analizi in opazovanju razvoja parnih struktur in kavitacijske erozije na površini vzorca v Venturijevem kanalu. Za izvedbo eksperimentov je bil uporabljen kavitacijski tunel, katerega osrednji del je bil prozoren testni odsek z Venturijevim kanalom (izdelanim iz sten iz pleksi stekla in kovinskega vstavka) za spremljanje procesa kavitacije. Za spremljanje poškodb, ki jih povzročata kavitacijska erozija in abrazija, se je kot najučinkovitejša rešitev izkazal pokazatelj v obliki črne akrilne barve, razredčene z vodo (v razmerju 1 : 2). Na površini vzorca je bil nameščen samolepilni aluminijasti trak za zaščito aluminijaste podlage pred erozijskimi lastnostmi zaradi kavitacije. Poleg tega je bila izvedena primerjava med kavitacijo s trdnimi delci in brez njih, da bi ugotovili učinke trdnih delcev na kavitacijo in površino vstavka. Opazovanja so pokazala, da se ne glede na trdne delce, poškodbe zaradi kavitacijske erozije pojavijo na mestu separacije kavitacijskega oblaka in in v bližini kolpasa kavitacijskega oblaka. Krogelni, stekleni delci premera od 40 µm do 70 µm so zgolj ob prisotnosti kavitacijskih struktur dodali abrazivni učinek na površino vstavka. Opazili smo, da se intenzivnost kavitacijske erozije in abrazije poveča, ko se kavitacijsko število zmanjša, volumski pretok pa poveča. Opravljena je bila tudi ekonomska analiza, da bi ugotovili, katera rešitev je stroškovno ugodnejša med zamenjavo kovinskega vstavka in nanosom zaščitnih premazov na kovinski vstavek.
Keywords:
kavitacijska erozija
,
trdni delci
,
abrazija
,
eksperiment
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