Modeling of a hollow-cone liquid spray including droplet collisions

Atomization characteristics and evaporation have major role in air‐fuel mixing and the combustion process in diesel engine. The aim of this study is to perform numerical and experimental analysis to investigate the spray pattern of biodiesel (waste cooking oil) generated from pressure swirl atomizer. The computation exhibits Eularian‐Lagrangian method to comprise flow of multiphase and also linearized instability sheet atomization (LISA) model to envisage atomization, sheet breakup, and film formation. The model's strength is the identification structure of spray created from pressure swirl atomizer. A three‐dimensional computational fluid dynamics work consisting of LISA and Taylor analogy breakup model are certified via experimentation taken from constant volume chamber. Further, spray tip penetration, cone angle, and sauter mean diameter (SMD) are identified for fuel (B100, B25, and D) under injection pressure of 110 and 160 MPa, and 2.8 MPa ambient pressure using swirl atomizer in constant volume chamber. This particular spray is quite important for application in diesel engines but is not extensively explored. The results reveal that as injection pressure increases from 110 MPa to 160 MPa. The spray tip penetration for B100, B25, and D are increased by 19.86%, 14.90%, and 14.50% respectively, further, cone angle at the start of injection decreases by 6%, 5%, and 3.41%, similarly, the average SMD decreases by 25%, 33.33%, and 25.4%, respectively. This is due to the rheological property of fuel, turbulent energy of droplet and air is maximum in primary breakup zone.

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“…The same k‐Ɛ model is used from earlier researches to validate against experimental data. It shows good accurateness and dependability 32,37 …”

Section: Numerical Simulationmentioning

confidence: 99%

“…Further, Asheim et al 32 incorporated a model to simulate drop‐drop collision that forms breakup or coalescence. Consequently, their collision model observed velocities well however under predicted droplet' sizes and over predicted trajectory angles of droplets, despite whether droplets collisions were included or neglected.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis on spray characteristics of biodiesel (waste cooking oil) using pressure swirl atomizer

Yadav

Gautam

2021

Environ Prog Sustainable Energy

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“…Based on experimental data, Marion G [2] , showed that turbulence intensity greatly effects droplet collision, but in his numerical model, only two identical droplets collide on collision and a droplet was only disrupted into two identical "children" droplets on breakup. The droplet collision algorithm of O'Rourke [3] is currently the widely used approach for calculating collisions in Lagrangian spray simulations, unfortunately this model is heavily grid-dependent, time-consuming and unreliably accurate [4] . Based on O'Rourke's model, Bird [5] presented the TC model, but it was found that the model is susceptible to initial droplet size distribution.…”

Section: Introductionmentioning

confidence: 99%

Droplet collision and coalescence model

et al. 2006

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A new droplet collision and coalescence model was presented a quick-sort method for locating collision partners was also devised and based on theoretical and experimental results, further advancement was made to the droplet collision outcome. The advantages of the two implementations of smoothed particle hydrodynamics (SPH) method were used to limit the collision of droplets to a given number of nearest droplets and define the probability of coalescence, numerical simulations were carried out for model validation. Results show that the model presented is mesh-independent and less time consuming, it can not only maintains the system momentum conservation perfectly, but not susceptible to initial droplet size distribution as well.

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