Three-dimensional numerical investigation and modeling of binary alumina droplet collisions

Hu, Chunbo; Xia, Siyou; Li, Chao; Wu, Guofeng

doi:10.1016/j.ijheatmasstransfer.2017.05.094

Cited by 62 publications

(47 citation statements)

References 37 publications

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“…gives 12which is the critical that describe the boundary of the bouncing regime as a function of . Hu et al (2017) extended the model of Estrade et al (1999) to higher viscosity systems, by considering the viscous dissipation within the droplet . Thus, the energy balance becomes…”

Section: Current Models For the Bouncing Regime Boundarymentioning

confidence: 99%

“…(10), in Eq. 14, as well as applying assumption 5, gives the model of Hu et al (2017), which predicts the critical of the lower boundary of the bouncing regime as a function of :…”

Section: Current Models For the Bouncing Regime Boundarymentioning

confidence: 99%

“…However, the model fails to predict the boundaries below the triple point. The only attempt to modify this model was by Hu et al (2017) who altered the considered kinetic energy, which will be explained later in section IV, and added a viscous loss term. However, the performance of this model was only validated against simulation data of alumina droplets…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new model for the bouncing regime boundary in binary droplet collisions

Al-Dirawi

Bayly

2019

Physics of Fluids

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This work experimentally investigates binary collisions of identical droplets over a range of liquid viscosities, using 2%, 4%, and 8% of hydroxypropyl methylcellulose (HPMC) solutions in water. The collisions were captured by a high-speed camera, and regime maps of collision outcomes derived. The performance of existing models of the boundary of the bouncing regime was assessed and found to give poor predictions. This was attributed to assumptions and errors in the treatment of kinetic energy and the droplet shape factors used in these models. A new model was derived which addresses these issues: the definition of the kinetic energy that contributes to deformation was corrected; a new shape factor that accurately reflects the geometry of the droplet at maximum deformation was proposed and, importantly, an empirical approach was implemented to account for the effect of the impact parameter on this shape factor. Moreover, the model includes an estimate of the viscous dissipation, which is calculated directly from experimentally observed difference between the impact and the rebound kinetic energies, and measurements of the post-collision droplet oscillations. The proposed model shows a striking improvement versus the existing models, reducing the mean absolute error by an order of magnitude.

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Section: Current Models For the Bouncing Regime Boundarymentioning

confidence: 99%

“…(10), in Eq. 14, as well as applying assumption 5, gives the model of Hu et al (2017), which predicts the critical of the lower boundary of the bouncing regime as a function of :…”

Section: Current Models For the Bouncing Regime Boundarymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new model for the bouncing regime boundary in binary droplet collisions

Al-Dirawi

Bayly

2019

Physics of Fluids

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“…Once the droplets ejected from the spray nozzle and having simulated their positions, velocities and diameters along their trajectory, it is necessary to consider the collision. Binary droplet collision models are a widely used theoretical approximation to obtain the outcome of the interaction droplets [17][18][19][20][33][34][35][36][37][38][39]. This model consists of estimating the positions, velocities, and diameters of droplets after the collision.…”

Section: Binary Collision Droplet Modelmentioning

confidence: 99%

An Eulerian-Lagrangian Coupled Model for Droplets Dispersion from Nozzle Spray

Sedano¹,

Aguirre²,

Brizuela³

2019

Advanced Computational Fluid Dynamics for Emerging Engineering Processes - Eulerian vs. Lagrangian

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In this chapter, an Euler-Lagrangian double-way coupled model is presented for simulating the liquid particle dispersion ejected from a high-pressure nozzle. The Eulerian code is advanced regional prediction system (ARPS), developed by Center of Analysis and Prediction of Storm (CAPS) and Oklahoma University, USA, which is specialized in weather simulation. This code is the double way coupled with a Lagrangian one-particle model. The theoretical remarks of the double-way coupling, the simulation of the liquid droplet trajectory, and, finally, the droplet collision in the spray cloud using a binary collision model are descripts. The results of droplet velocities and diameters are compared with experimental laboratory measurements. Finally, agrochemical spraying over a cultivated field in weak wind and high air temperature conditions is showed.

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“…Li predicted the coalescence‐bouncing transitions of head‐on binary droplet collisions by a novel macroscopic model based entirely on fundamental laws of physics. Hu et al investigated the off‐center collision of binary equal‐sized alumina droplets by a direct numerical simulation method, which involved VOF and the adaptive mesh refinement method.…”

Section: Introductionmentioning

confidence: 99%

A modified SPH method to model the coalescence of colliding non‐Newtonian liquid droplets

Tang

2019

Numerical Methods in Fluids

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Summary This paper develops a modified smoothed particle hydrodynamics (SPH) method to model the coalescence of colliding non‐Newtonian liquid droplets. In the present SPH, a van der Waals (vdW) equation of state is particularly used to represent the gas‐to‐liquid phase transition similar to that of a real fluid. To remove the unphysical behavior of the particle clustering, also known as tensile instability, an optimized particle shifting technique is implemented in the simulations. To validate the numerical method, the formation of a Newtonian vdW droplet is first tested, and it clearly demonstrates that the tensile instability can be effectively removed. The method is then extended to simulate the head‐on binary collision of vdW liquid droplets. Both Newtonian and non‐Newtonian fluid flows are considered. The effect of Reynolds number on the coalescence process of droplets is analyzed. It is observed that the time up to the completion of the first oscillation period does not always increase as the Reynolds number increases. Results for the off‐center binary collision of non‐Newtonian vdW liquid droplets are lastly presented. All the results enrich the simulations of the droplet dynamics and deepen understandings of flow physics. Also, the present SPH is able to model the coalescence of colliding non‐Newtonian liquid droplets without tensile instability.

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Three-dimensional numerical investigation and modeling of binary alumina droplet collisions

Cited by 62 publications

References 37 publications

A new model for the bouncing regime boundary in binary droplet collisions

A new model for the bouncing regime boundary in binary droplet collisions

An Eulerian-Lagrangian Coupled Model for Droplets Dispersion from Nozzle Spray

A modified SPH method to model the coalescence of colliding non‐Newtonian liquid droplets

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