Numerična optimizacija oblike šobe za plinsko fokusiranje

Bartolj, Jan (author), Šarler, Božidar (mentor), Majdič, Franc (comentor)

Plinsko tokovno fokusiranje je postopek, pri katerem z vzporednim tokom fokusiramo curek kapljevine z obtekajočim plinom. Najpomembnejši element je šoba, ki mora biti oblikovana tako, da je fokusiranje ustrezno glede na zahteve uporabnika. Pri tokovnem fokusiranju ima na hitrost curka fokusirane kapljevine največji vpliv strižna sila, ki se pojavi kot posledica pretoka obtekajočega plina. Uporabili smo gradientno adjungirano numerično optimizacijsko metodo, s katero smo skušali spremeniti obliko šobe tako, da bi povečali strižno silo na curek. Z uporabo metode smo dokazali, da lahko strižno silo na curek povečamo za več kot 100 %.

• Language: Slovenian
• Keywords: tokovno fokusiranje, mikrofluidika, strižna sila, pretok, numerična optimizacija, gradientno adjungirana metoda
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2024
• PID: 20.500.12556/RUL-161637
• Publication date in RUL: 13.09.2024

Secondary language

• Language: English
• Title: Numerical optimization of the shape of flow-focusing nozzle

Abstract

Gas flow focusing is a process in which a liquid jet is focussed with the aid of a gas flowing in parallel. The most important element is the nozzle, which must be designed in such a way that focusing takes place according to the user's requirements. In stream focussing, the shear force generated by the flow of the flowing gas has the largest influence on the jet velocity of the focused liquid. Using a numerical gradient-adjoint optimisation method, we attempted to change the shape of the nozzle in order to increase the shear force on the stream. Using this method, we have shown that the shear force per jet can be increased by more than 100 %.

• Keywords: flow focusing, microfluidics, shear force, flow, numerical optimization, gradient adjoint method