20.500.12556/RUL-138687 Computational modeling and simulation of gas focused liquid micro-sheets The purpose of this work is to numerically evaluate the behavior of microscopic gas-focused liquid sheets in terms of material properties, nozzle structure and operating conditions used for experiments in spectroscopy and scattering where a short optical path is required. The numerical simulations are presented of a gas flow focusing nozzle, capable of producing a stream consisting of a sequence of perpendicular micrometre thin liquid sheets. The nozzle structure consists of a central circular capillary for delivery of the liquid and two circular capillaries that provide the focusing gas flow in a converging direction from opposite directions. High velocity impinging gas jets accelerate and form a thin elliptically shaped liquid sheet which contracts downstream and eventually forms a similar shaped sheet in the plane perpendicular to the primary sheet. The process repeats further downstream with another contraction, forming the tertiary sheet, existing now in the same plane as the primary sheet. This produces a liquid jet in form of a series of perpendicular micrometre thin liquid sheets. Three dimensional conservation equations of mass, energy and momentum for a compressible two-phase system are solved with a finite volume approach and an algebraic volume of fluid method. The influence of liquid viscosity, density, surface tension, nozzle layout variation as well as gas and liquid operating parameters on the evolution of the primary liquid sheet is elaborated. The parameter space of six flow characterizing dimensionless numbers is explored in the following ranges: Reynolds gas number 64–130, Reynolds liquid number 122–620, Weber number 23–803, ratio of liquid to gas mass flow rate 16–58, viscosity ratio 26–79, and density ratio 4807–7221. The layout of the primary sheet is given in terms of sheet thickness, width and length. The results show minor effect of dynamic viscosity, a moderate effect of density and a dominant role of the surface tension. The liquid sheet shape is sensitive to the variation of gas and liquid flow rates as well as the nozzle’s structure width and the angle between the liquid delivery and the focusing gas capillaries. liquid micro-sheets two-phase nozzle flow computational model sensitivity study liquid properties operating conditions tekoče mikroskopske ploskve dvofazni tok skozi šobo računski model študija občutljivosti lastnosti tekočine obratovalni pogoji true false true Angleški jezik Slovenski jezik Članek v reviji 2022-08-09 13:17:16 2022-08-09 13:17:28 2022-09-15 04:17:03 0000-00-00 00:00:00 2021 0 0 13 str. Vol. 140, art. 103666 Jul. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 519.876.5:532.529 0301-9322 10.1016/j.ijmultiphaseflow.2021.103666 59703811 1-s2.0-S0301932221001142-main.pdf 1-s2.0-S0301932221001142-main.pdf 1 6A0CECE29AA120F41DDBAFC38153E912 0807e49afbbceb95a02b2d82361f88d1273f87d0ce8ec832010d639869554434 dcd22286-17d4-11ed-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=159090 https://www.sciencedirect.com/science/article/pii/S0301932221001142 1 91199faf-17d4-11ed-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=159089 Fakulteta za strojništvo 0 0 0