Numerical analysis of the internal flow and the mixing chamber length effects on the liquid film thickness exiting from the effervescent atomizer

Kaklar, Zahra Alizadeh; Ansari, Mohammad Reza

doi:10.1007/s10973-018-7485-3

Cited by 12 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This type of simplification is common in multiphase computational analysis. Many studies with segregated and annular flows assume bilateral or even axi-symmetry [5,10] in inclined and vertical flows. It is important to note that the simplification does not mean that each quarter of the nozzle behaves exactly the same, but rather that there is no consistent difference between each quarter of the nozzle.…”

Section: Nozzle Design and Mesh Generationmentioning

confidence: 99%

“…While there are some computational studies of pneumatic internal-mixing models, most of them modelled only waterair mixtures or did very limited experimental validation of the model [5,6]. Only Wittner et al [7] focused on the ACLR nozzle design.…”

Section: Introductionmentioning

confidence: 99%

“…Only Wittner et al [7] focused on the ACLR nozzle design. However, they assumed a constant density for the gas phase, instead of using a compressible gas model, which can increase simulation error [5]. The purpose of this study was therefore to develop an efficient and reliable CFD model that could accurately represent the flow conditions inside the ACLR nozzle, and to validate this model with experimental data with a high-viscosity fluid, since it is the main application of this type of nozzle.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Analysis and CFD Modelling of the Flow Conditions inside an Air-Core-Liquid-Ring Atomizer

Ballesteros¹,

Gaukel²

2022

International Conference on Fluid Flow, Heat and Mass Transfer

View full text Add to dashboard Cite

The Air-Core-Liquid-Ring (ACLR) atomization is an innovative internal-mixing pneumatic atomization technique, suitable for energy-efficient spray drying because of its ability to handle highly viscous liquid feeds with high solid contents. However, pneumatic atomizers such as the ACLR can suffer from unstable internal flow conditions, which may lead to a wide variation in the droplet diameter obtained. Therefore, the internal flow conditions of an ACLR-atomizer prototype needed to be studied and comprehended. With that in mind, a computational fluid dynamic (CFD) model was developed, and tested with experimental data collected for different gas pressures and liquid feed viscosities. A mesh independence study, as well as some testing of Physics models were performed. A mixed polyhedralprismatic mesh was generated, and the k-ω SST model was selected as it showed a good balance between representation of the turbulence in the system and computational effort. The predicted average lamella thickness is similar with experimental results, with an average 10 % error, but the thickness variations observed in the experiments dampen quickly over time in the simulations. This is not the case in the experiments with the higher viscous maltodextrin solution. Therefore, further model refining has still to be done. Nonetheless, the flow behaves as expected in the CFD simulation with changes in pressure and liquid viscosity. This opens up the possibilities of doing more in-detail CFD studies of the effect of liquid feed properties and geometrical variations of the nozzle.

show abstract

Section: Nozzle Design and Mesh Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Analysis and CFD Modelling of the Flow Conditions inside an Air-Core-Liquid-Ring Atomizer

Ballesteros¹,

Gaukel²

2022

International Conference on Fluid Flow, Heat and Mass Transfer

View full text Add to dashboard Cite

show abstract

Numerical Analysis of Two-Phase Flow Using 2-D Axi-Symmetric Approach for an Effervescent Atomizer

Koti,

Saha

2024

Springer Proceedings in Energy

View full text Add to dashboard Cite

Time-Averaged Analysis and Numerical Modelling of the Behavior of the Multiphase Flow and Liquid Lamella Thickness Inside an Internal-Mixing ACLR Nozzle

Martínez

Gaukel

2023

Flow Turbulence Combust

View full text Add to dashboard Cite

The Air-Core-Liquid-Ring (ACLR) atomizer is an innovative internal-mixing pneumatic atomization technique, suitable for energy-efficient spray drying of highly viscous liquid feeds, with high solid contents. However, pneumatic atomizers such as the ACLR can suffer from unstable internal flow conditions, which may lead to a wide variation in the droplet diameter obtained. Therefore, the internal flow conditions of an ACLR-atomizer needs to be properly studied and comprehended. With that in mind, a computational fluid dynamic (CFD) model was implemented and tested with experimental data collected for different air pressures and liquid feed viscosities. The model used can predict average lamella thickness with a relative error of less than 10%, when compared to experimental results, although some degree of artificial dampening of the flow instabilities occurs at high viscosities and low pressures. These instabilities have to be investigated in more detail from both the numerical side, by further refining the CFD model to capture the moment-to-moment behavior of the flow, as well as on the experimental side, by studying the instability development at higher recording speeds.

show abstract

Numerical analysis of the internal flow and the mixing chamber length effects on the liquid film thickness exiting from the effervescent atomizer

Cited by 12 publications

References 18 publications

Experimental Analysis and CFD Modelling of the Flow Conditions inside an Air-Core-Liquid-Ring Atomizer

Experimental Analysis and CFD Modelling of the Flow Conditions inside an Air-Core-Liquid-Ring Atomizer

Numerical Analysis of Two-Phase Flow Using 2-D Axi-Symmetric Approach for an Effervescent Atomizer

Time-Averaged Analysis and Numerical Modelling of the Behavior of the Multiphase Flow and Liquid Lamella Thickness Inside an Internal-Mixing ACLR Nozzle

Contact Info

Product

Resources

About