Alternative geometric arrangements of the nozzle outlet orifice for liquid micro-jet focusing in gas dynamic virtual nozzles

Božidar Šarler (Avtor), Rizwan Zahoor (Avtor), Saša Bajt (Avtor)

Povzetek

Liquid micro-jets are crucial for sample delivery of protein crystals and other macromolecular samples in serial femtosecond crystallography. When combined with MHz repetition rate sources, such as the European X-ray free-electron laser (EuXFEL) facility, it is important that the diffraction patterns are collected before the samples are damaged. This requires extremely thin and very fast jets. In this paper we first explore numerically the influence of different nozzle orifice designs on jet parameters and finally compare our simulations with the experimental data obtained for one particular design. A gas dynamic virtual nozzle (GDVN) model, based on a mixture formulation of Newtonian, compressible, two-phase flow, is numerically solved with the finite volume method and volume of fluid approach to deal with the moving boundary between the gas and liquid phases. The goal is to maximize the jet velocity and its length while minimizing the jet thickness. The design studies incorporate differently shaped nozzle orifices, including an elongated orifice with a constant diameter and an orifice with a diverging angle. These are extensions of the nozzle geometry we investigated in our previous studies. Based on these simulations it is concluded that the extension of the constant diameter channel makes a negligible contribution to the jet's length and its velocity. A change in the angle of the nozzle outlet orifice, however, has a significant effect on jet parameters. We find these kinds of simulation extremely useful for testing and optimizing novel nozzle designs.

Ključne besede

serijska femtosekundna kristalografija;mikro-curek;brizganje;kapljanje stisljiv dvofazni tok;metoda končnih volumnov;metoda volumna tekočine;zasnova odprtine šobe;serial femtosecond crystallography;micro-jet;jetting;dripping;compressible two-phase flow;finite volume method;volume of fluid method;nozzle orifice design;

Podatki

Jezik:	Angleški jezik
Leto izida:	2021
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UL FS - Fakulteta za strojništvo
UDK:	519.8:533(045)
COBISS:	57106947
ISSN:	1996-1944
Št. ogledov:	160
Št. prenosov:	53
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	serijska femtosekundna kristalografija;mikro-curek;brizganje;kapljanje stisljiv dvofazni tok;metoda končnih volumnov;metoda volumna tekočine;zasnova odprtine šobe;
Vrsta dela (COBISS):	Članek v reviji
Strani:	str. 1-18
Letnik:	ǂVol. ǂ14
Zvezek:	ǂiss. ǂ6
Čas izdaje:	Mar. 2021
DOI:	10.3390/ma14061572
ID:	14657174