Usage of extruded diamond multi-injectors for improvement of fuel mixing inside the supersonic combustion chamber

Seraj, Hossein; Hosseinnejad, Farhad; Rostamiyan, Yasser; Fallah, Keivan

doi:10.1038/s41598-023-42487-2

Cited by 7 publications

(1 citation statement)

References 51 publications

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“…A wide range of experimental and numerical studies are employed to investigate fluid flow phenomena in diverse fields, including two phase flow 33 , 34 , porous media, unsteady flow 35 , 36 , aneurysm 37 , 38 , Supersonic flow 39 , 40 , and the manipulation of droplets in microfluidic devices 14 – 23 . According to Link et al 27 , two methods for passively breaking larger droplets into unequal-sized droplets are using an obstacle inside a straight channel and a T-junction with unequal length branches.…”

Section: Introductionmentioning

confidence: 99%

Influence of triangular obstacles on droplet breakup dynamics in microfluidic systems

Tazikeh Lemeski,

Seyyedi,

Hashemi-Tilehnoee

et al. 2024

Sci Rep

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Microfluidic devices with complex geometries and obstacles have attracted considerable interest in biomedical engineering and chemical analysis. Understanding droplet breakup behavior within these systems is crucial for optimizing their design and performance. This study investigates the influence of triangular obstacles on droplet breakup processes in microchannels. Two distinct types of triangular obstructions, positioned at the bifurcation (case I) and aligned with the flow (case II), are analyzed to evaluate their impact on droplet behavior. The investigation considers various parameters, including the Capillary number (Ca), non-dimensional droplet length (L*), non-dimensional height (A*), and non-dimensional base length (B*) of the triangle. Utilizing numerical simulations with COMSOL software, the study reveals that the presence of triangular obstacles significantly alters droplet breakup dynamics. Importantly, the shape and location of the obstacle emerge as key factors governing breakup characteristics. Results indicate faster breakup of the initial droplet when the obstacle is positioned in the center of the microchannel for case I. For case II, the study aims to identify conditions under which droplets either break up into unequal-sized entities or remain intact, depending on various flow conditions. The findings identify five distinct regimes: no breakup, breakup without a tunnel, breakup with a tunnel, droplet fragmentation into unequal-sized parts, and sorting. These regimes depend on the presence or absence of triangular obstacles and the specific flow conditions. This investigation enhances our understanding of droplet behavior within intricate microfluidic systems and provides valuable insights for optimizing the design and functionality of droplet manipulation and separation devices. Notably, the results emphasize the significant role played by triangular obstacles in droplet breakup dynamics, with the obstacle’s shape and position being critical determinants of breakup characteristics.

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