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A Study of Waterjets: Characterization of waterjet in the water atomization process
KTH, School of Industrial Engineering and Management (ITM).
KTH, School of Industrial Engineering and Management (ITM).
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

This study was regarding the waterjets in the water atomization process. This is because the understanding of the waterjets is not complete and with a greater understanding the production of metal powder could be improved.

The waterjets were going to be categorized according to their wave function, size and distribution of the droplets and the three regimes that Höganäs had divided up the jets into was also analyzed. The three regimes depend on the jets characteristics and the regimes are the transparent, milky and the droplet jet.

The purpose was to get a better understanding of the correlation between velocity, temperature, waves, size and distribution of the droplets in a 50 cm long waterjet.

The method to enhance the understanding of this project was to first do theoretical solution with the help of fluid dynamics. Weber, Reynolds and Ohnesorge number were calculated and evaluated to get a better understanding of the waterjet. Secondly, experiments were conducted where a waterjet with different nozzles and temperatures was filmed with a highspeed camera and the videos were analyzed with the help of a software package called ImageJ.

The results show the correlation between increasing temperature and decreasing droplet size and a less cohesive waterjet core. The conclusion from the study was that with the help of temperature one can help control the droplet size.

Abstract [sv]

Denna studie angår vattenstrålar i en vattenatomiserings process vid tillverkning av metallpulver och en bättre förståelse skulle förbättra tillverkningen av metallpulver.

Vattenstrålen skulle kartläggas enligt dess vågfunktion, storlek och spridning av dropparna och de tre regionerna som Höganäs har delat upp vattenstrålen i skulle analyseras. Regionerna är beroende av strålens karaktäristiska utseenden vid olika delare av vattenstrålen och är genomskinlig, mjölkig och dropp stråle.

Syftet med studien var att få en bättre förståelse av sambandet mellan hastighet, temperatur, vågor, storlek och spridning av dropparna i en 50 cm lång vattenstråle.

Metoden som användes för att öka förståelsen av vattenstrålen var först en teoretisk del med hjälp av fluidmekanik. Weber, Reynolds och Ohnesorge tal beräknades och utvärderades för att ge en teoretisk förståelse för vattenstrålen. Sedan utfördes vattenflödesexperiment, där vattenstrålen filmades med olika munstycken och temperaturer med en höghastighetskamera och videon analyserades med hjälp av mjukvaran kallad ImageJ.

Resultaten visar ett samband mellan ökad temperatur och minskad droppstorlek och en mer uppbruten kärna av vattenstrålen. Slutsatsen från studien var att man med hjälp av temperaturen kan reglera droppstorleken.

Place, publisher, year, edition, pages
2018. , p. 30
Keywords [en]
Waterjets, metalpowder, Atomization process, Nozzle, water, metal, powder, Metal production
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-231581OAI: oai:DiVA.org:kth-231581DiVA, id: diva2:1229434
Subject / course
Materials Design and Engineering
Educational program
Master of Science in Engineering - Materials Design and Engineering
Presentation
2018-05-15, Stockholm, 14:45 (Swedish)
Supervisors
Examiners
Available from: 2018-07-02 Created: 2018-06-29 Last updated: 2018-07-02Bibliographically approved

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