magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Gaia Kravanja (Author), Matija Jezeršek (Mentor)

Abstract

Pljuskanje kapljic predstavlja pomembno področje preučevanja interakcije tekočin s trdninami. Na dinamiko pljuskanja vpliva vrsta parametrov, med drugim tudi struktura površine in elastični modul podlage. Magnetni elastomeri (MRE) so podvrženi magnetoreološkemu efektu, katerega lahko izkoristimo za spreminjanje trdnosti podlage s spremembo magnetnega polja. S pomočjo umerjenega eksperimentalnega sistema temelječega na hitri senčni fotografiji smo spremljali pojav pljuskanja na lasersko strukturiranih površinah MRE. Ugotovili smo, da lahko vplivamo na dinamiko pljuskanja bodisi z laserskim mikro strukturiranjem površine, bodisi s spreminjanjem gostote magnetnega polja. Linijska mikro struktura površine pospeši napredovanje diska tekočine v smeri utorov neodvisno od prisotnosti magnetnega polja v primerjavi z nestrukturirano. V magnetnem polju pa se poveča modul elastičnosti MRE, zaradi česar pride do razpršitve pri nižji hitrosti kapljice.

Keywords

magistrske naloge;pljuskanje kapljic;dinamika razpršitve;lasersko mikrostrukturiranje;magnetoreološki elastomer;strukturirana površina;hitra senčna fotografija;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [G. Kravanja]
UDC: 532.6:678.074:535(043.2)
COBISS: 28352771 Link will open in a new window
Views: 697
Downloads: 121
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Other data

Secondary language: English
Secondary title: Splashing on laser structured surfaces of magnetorheological elastomers
Secondary abstract: Droplet impacts represent an important area of research of interaction between fluids and solids. The outcome of the splashing dynamics is determined by a number of factors, namely- among others- the structure of the solids surface and the solids Young modulus. The physical properties of magnetorheological elastomers are influenced by the presence of a magnetic field, which we can employ to alter the solid's stiffness. We observed the splashing dynamics of droplets on laser microstructured surfaces of magnetorheological elastomers by means of a calibrated experimental setup based on high speed shadowgraphy image capture. We discovered that we can speed up the spreading regime in the direction of linear microstructured channels on the impact surfaces independently of the presence of a magnetic field. By applying a magnetic field we increased the magnetorheological elastomer's Young modulus and thus splashing occured at a lower impact velocity.
Secondary keywords: master thesis;droplet impact;splashing dynamics;laser microstructuring;magnetorheological elastomer;structured surface;high speed shadowgraphy;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XXIV, 60 str.
ID: 11983469