Interface-capturing numerical studies of multicomponent spray and droplet vaporization

Palmore, John; Lin, Yushu

doi:10.2514/6.2022-1444

Cited by 1 publication

(2 citation statements)

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“…Spray combustion consists a series of complex physical processes, including jet atomization (also called primary atomization), droplet breakup (also called sec-ondary atomization), evaporation, droplet interaction, and combustion. In Figure .1, a 2D simulation is performed to show liquid jet atomizaiton [22]. A liquid jet is injected into the crossflow, and droplets are produced from jet fragmentation of the jet.…”

Section: Introductionmentioning

confidence: 99%

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The effect of droplet deformation and internal circulation on drag coefficient

Lin¹,

Palmore²

2022

Preprint

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The current study uses numerical approaches to investigate the effect of droplet deformation and internal circulation on droplet dynamics. Although droplet drag is a classical area of study, there are still theoretical gaps in understanding the motion of large droplets. In applications like spray combustion, droplets of various sizes are generated and move with the flow. Large droplets tend to deform in the flow, and have complex interactions with the flow because of this deformation. To better model spray, the physical understanding of droplets need to be improved.Under spray conditions, droplets are subjected to a high temperature and pressure environment, and the coupling between liquid and gas is enhanced. Therefore, the deformation and internal circulation will affect droplet drag coefficient more significantly than in atmospheric conditions.To study the mechanism on how droplet shape and internal circulation influence droplet dynamics, we will use direct numerical simulation (DNS) to simulate a droplet falling at its terminal velocity in high pressure air. An in-house code developed for interface-capturing DNS of multiphase flows will be employed for the simulation. The drag coefficient is calculated, and the results are consistent with existing literature for slightly deformed droplets. The results show that the drag coefficient is directly related to the droplet deformation and droplet internal circulation. The paper also develops a theory to account the effect of Weber number and liquid/gas properties in droplet deformation.

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Section: Introductionmentioning

confidence: 99%

“…Although it is technically feasible to perform simulations of high-fidelity simulations of the type used in Fig. 1, such simulations are largely restricted to use in specialized codes associated to academic and government research labs [12,22,33]. To simulate droplet motion is too computationally expensive in practice.…”

Section: Introductionmentioning

confidence: 99%