A numerical study of gas focused non-Newtonian micro-jets

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

The present numerical study assesses the jet length, diameter and velocity of various non-Newtonian power-law fluids of a gas dynamic virtual nozzle. A related two-phase flow problem is formulated within the mixture framework and solved with the finite volume method and volume of fluid interface treatment in axisymmetry. The process parametric range allows the incompressible laminar flow assumption. A comprehensive jet characteristics analysis is carried out in a typical micro-nozzle configuration for a range of shear-thinning to shear-thickening fluids with power law indices 0.5 ≤ n < 1.5, gas mass flow rate of 10 mg/min and liquid volumetric flow rate of 43 µl/min, resulting in a gas Reynolds number of 130 with Reynolds and Weber numbers for a reference water jet being 90 and 10, respectively. It is observed that jets from shear-thinning fluids (0.5 ≤ n < 1.0) tend to be thicker, longer, and slower when compared with the shear-thickening fluids (1.0 < n ≤ 1.5). A dripping-jetting phase diagram of the nozzle is constructed by varying the power law index, gas and liquid flow rates in the range 0.9–1.1, 5–15 mg/min and 5–50 µl/min, respectively. It is observed that the area of stable jetting decreases with the increase of the power law index. The obtained novel information on the behaviour of non-Newtonian gas-focused micro-jets provides a possible new dimension for tailoring the serial crystallography sample delivery systems where the micro-jets carry dispersed crystals into an X-ray beam.

• Jezik: Angleški jezik
• Ključne besede: serial crystallography, micro jets, multiphase flow, fluid rheology, non-Newtonian fluid, flow focusing, gas dynamic virtual nozzle, liquid jets, power law, shear thinning, shear thickening
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: 16 str.
• Številčenje: Vol. 170, art. 104628
• PID: 20.500.12556/RUL-151690
• UDK: 532:519.6
• ISSN pri članku: 0301-9322
• DOI: 10.1016/j.ijmultiphaseflow.2023.104628
• COBISS.SI-ID: 168605443
• Datum objave v RUL: 16.10.2023

Gradivo je del revije

• Naslov: International journal of multiphase flow
• Skrajšan naslov: Int. j. multiph. flow
• Založnik: Elsevier
• ISSN: 0301-9322
• COBISS.SI-ID: 25649408

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: serijska kristalografija, mikrocurki, večfazni tok, reologija toka, nenewtonska tekočina, fokusiranja toka