Drop breakup in a symmetric T-junction microchannel under electric field

Jafari, Iman; Fallah, Keivan

doi:10.1007/s10404-020-02399-3

Cited by 32 publications

(6 citation statements)

References 40 publications

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“…Computational technique widely developed for solving engineering problems. [38][39][40][41][42][43][44][45][46][47][48][49] Besides, this methodology is extensively used for the energy harvesting [50][51][52][53][54] and evaluation of proposed efficient systems in the aerospace applications. [55][56][57][58][59][60][61]…”

Section: Validation and Verification Of Resultsmentioning

confidence: 99%

Computational study of hydrogen and air co-flow jets mixing in dual-combustor ramjet in presence of ramp shock generator

Rostamian

Maddah

Rostamiyan

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Flame stabilization distribution and efficient fuel mixing are highly significant in the performance of ramjet engine. In this paper, numerical studies are done to investigate the supersonic combustion of hydrogen and air co-flow in presence of the ramp edge. In this study, flame maintenance and combustion formation in a dual-combustion ramjet engine are fully investigated. The primary emphasis of this work is to disclose the impact of produced shocks due to the existence of ramp edge on the structure of fuel and air-jet immediately downstream of injector. The shock interactions of two different angles (10 deg and 30 deg) of the ramp edge are investigated. Favre-averaged conservation equations are considered for the simulation of compressible flows inside the combustor. Various mechanisms expressing the flame spreading characteristics are also examined. Depending on the angle of the ramp edge, the produced shock waves influence on size and strength of vortices. Our findings also show that high angles of ramp edge augment the fluctuation of the vortices by the splitter and consequently, fuel mixing enhances in the combustion chamber of ramjet engine. Our findings also confirm that the similar jet pressure would be more effective on the vortex production downstream of the splitter. The application of ramp edge with angle of 30 deg would increase average momentum thickness of the mixing layer up to 55%.

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Section: Validation and Verification Of Resultsmentioning

confidence: 99%

Computational study of hydrogen and air co-flow jets mixing in dual-combustor ramjet in presence of ramp shock generator

Rostamian

Maddah

Rostamiyan

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…26 Link et al 27 first demonstrated the efficacy of electric fields in manipulating microfluidic droplet behaviors, such as deformation and sorting, in T-junction microchannels. Subsequent studies by Jafari and Fallah 28 and Yin et al 29 for advancements in on-demand droplet generation control. Despite these advancements, a gap remains in the ability to initiate and halt droplet production precisely and instantaneously, which is crucial for various applications requiring dynamic control.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Link et al first demonstrated the efficacy of electric fields in manipulating microfluidic droplet behaviors, such as deformation and sorting, in T-junction microchannels. Subsequent studies by Jafari and Fallah and Yin et al have further explored the impact of electric fields on droplet behavior, with Yin et al finding a direct correlation between electrical frequency and the transition in droplet formation regimes. These studies not only collectively underscore the efficacy of electric fields in microfluidic droplet manipulation but also highlight the need for advancements in on-demand droplet generation control.…”

Section: Introductionmentioning

confidence: 99%

Drop-On-Demand Microdroplet Generation under Charge Injection by Corona Discharge

Tang,

Song,

Wang

et al. 2024

Langmuir

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In printing, microreactors, and bioassays, the precise control of micrometer-scale droplet generation is essential but challenging, often restricted by the equipment and nozzles used in traditional methods. We introduce a needle-plate electrode corona discharge technique that injects charges into an oil layer, enabling the precise manipulation of droplet polarization and splitting. This method allows for meticulous adjustment of microdroplet formation regarding location, size, and quantity by modulating the discharge voltage, discharge time, and electrode positioning. It enables the immediate initiation and cessation of droplet production, thereby facilitating on-demand droplet generation. Our study on the voltage-dependent droplet stretch coefficient shows that as the voltage increases, the droplets transition from controlled splitting to regular Taylor cone-like ejections, eventually reaching the Rayleigh limit and fully breaking apart. These advancements significantly improve microfluidic droplet manipulation, offering considerable benefits for applications in targeted drug delivery, rapid disease diagnostics, and precise environmental monitoring.

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“…Hence, the active technique is suggested to regulate droplets. This technique is achieved by applying an additional energy field involving temperature field 21 , magnetic field 13 , 27 , micro-valves 25 , 31 , and electric field 14 , 17 , 29 , 30 . Besides the benefit of fast response time, another advantage of this method is that it is easy and reliable to precisely control the droplet's size and flexibility in changing the size.…”

Section: Introductionmentioning

confidence: 99%

“…They applied an electric field parallel to the flow after the intersection of the symmetric T-junction microchannel. Jafari and Fallah 30 numerically investigated the effects of electric field on droplet breakup in a symmetric T-junction microchannel. They showed that droplet splits faster in the presence of an electric field compared to the case without the electric field at the same condition.…”

Section: Introductionmentioning

confidence: 99%

Splitting of droplet with different sizes inside a symmetric T-junction microchannel using an electric field

Fallah

Fattahi

2022

Sci Rep

Self Cite

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In the current study, droplets dynamics under an asymmetric electric field in a T-junction are numerically studied using COMSOL Multi-physics software. The effect of different factors such as dimensionless length of mother droplet (L*), Capillary number (Ca), and electric capillary number (Cae) are investigated on the breakup process in symmetric T-junctions. Two novel patterns of droplets, namely, hybrid asymmetric splitting mode and sorting patterns, have been observed by imposing an electric field in one branch of the microchannel. It is also concluded that using an electric field is a promising strategy to reach droplets with arbitrary sizes and control over the splitting ratio of daughter droplets precisely in a T- junction by adjusting the electric field strength. After a certain electric capillary number ($$\left. {Ca_{e} } \right|_{Sorting}$$ C a e Sorting ), the mother droplet does not breakup and is sorted on the side of the branch that the electric field imposes. Furthermore, $$\left. {Ca_{e} } \right|_{Sorting}$$ C a e Sorting increases with the increment of L* and Ca.

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Drop breakup in a symmetric T-junction microchannel under electric field

Cited by 32 publications

References 40 publications

Computational study of hydrogen and air co-flow jets mixing in dual-combustor ramjet in presence of ramp shock generator

Computational study of hydrogen and air co-flow jets mixing in dual-combustor ramjet in presence of ramp shock generator

Drop-On-Demand Microdroplet Generation under Charge Injection by Corona Discharge

Splitting of droplet with different sizes inside a symmetric T-junction microchannel using an electric field

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