Analysis Methods for Direct Numerical Simulations of Primary Breakup of Shear-Thinning Liquid Jets

Ertl, Moritz

doi:10.1615/atomizspr.2017017448

Cited by 16 publications

(6 citation statements)

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“…Shear‐thinning behavior enhances the atomization performance, while shear‐thickening behavior is the opposite because of high viscosity. Ertl and Weigand 46 studied the primary breakup of shear‐thinning fluids, and their results also approve the above perspectives. CWS is now widely used in gasification and combustion as a working fluid.…”

Section: Introductionmentioning

confidence: 66%

Primary breakup of shear‐thickening suspension jet by an annular air jet

Wang

Zhao

et al. 2022

AIChE Journal

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An experimental investigation is conducted to study the influence of shear‐thickening behavior on the primary breakup process of suspension jets. The primary breakup morphologies of cornstarch–water suspension are observed via a high‐speed camera. The unique hardened breakup mode only occurs when the suspension exhibits discontinuous shear thickening (DST). During hardened breakup mode, the oscillating portion of the suspension jet becomes perpendicular to the air direction and keeps cylindrical instead of deforming into a thin sheet or membrane structure. The suspension jets break off into large pieces rather than tiny droplets. The dimensionless number N is established to describe the relative magnitude of the increment of the viscous force and aerodynamic force during the primary breakup process. The primary breakup regime map of Newtonian fluids and shear‐thickening suspensions is also promoted based on the dimensionless number N and the Weber number We.

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Section: Introductionmentioning

confidence: 66%

Primary breakup of shear‐thickening suspension jet by an annular air jet

Wang

Zhao

et al. 2022

AIChE Journal

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“…The system is used to analyse a jet dataset [4,5] with the help of different tools. First, we can take a look at the quantity relation view to find high-level relations between the quantities.…”

Section: Visual Analysis Of Droplet Dynamics In Large-scale Multiphas...mentioning

confidence: 99%

Interactive Visualization of Droplet Dynamic Processes

Heinemann

Sadlo

Ertl

2022

Fluid Mechanics and Its Applications

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This article presents an overview of visual analysis techniques specifically developed for high-resolution direct numerical multiphase simulations in the droplet dynamic context. Visual analysis of such data covers a large range of tasks, starting from observing physical phenomena such as energy transport or collisions for single droplets to the analysis of large-scale simulations such as sprays and jets. With an increasing number of features, coalescence and breakup events might happen, which need to be visually presented in an interactive explorable way to gain a deeper insight into physics. But also the task of finding relevant structures, features of interest, or a general dataset overview becomes non-trivial. We present an overview of new approaches developed in our SFB-TRR 75 project A1 covering work from the last decade to the current work-in-progress. They are the basis for relevant contributions to visualization research as well as useful tools for close collaborations within the SFB.

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“…The rheological properties of the working fluids also affect the primary breakup process such as viscoelasticity and shear-thinning behavior. The dispersion equation is studied to explain the destabilization of the jet. − Experimental results showed that viscoelasticity influences the evolution and distribution of the drops at the far field. , Through experimental and simulation studies, it is indicated that the shear-thinning behavior enhances the breakup of the jet. − According to Ertl and Weigand, the external surface of the jet deforms due to the high-velocity gradient, which leads to a decrease in viscosity and allows it to deform more easily. This process is self-exciting because the jet becomes more easily deformed, leading to a higher shear rate and stronger breakup.…”

Section: Introductionmentioning

confidence: 99%

Inhibitory Effects of Convergent Annular Nozzles on the Primary Breakup of Discontinuous Shear-Thickening Suspensions

Wang,

Zhao,

et al. 2024

Ind. Eng. Chem. Res.

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Annular air nozzles with different geometrical properties are used to investigate their influence on the primary breakup of discontinuous shear-thickening suspensions. By the use of a high-speed camera, the primary breakup process is visualized. Contrary to conventional fluids, no improvement in the atomization performance of discontinuous shear-thickening suspensions is achieved by using convergent annular air nozzles. Compared to a uniform sectional nozzle, the suspension jet exhibits shattering breakup at a higher critical Weber number when using convergent nozzles. In the shattering breakup mode, the breakup occurs close to the exit, while the cross-section is flat, which may be due to being stretched. Based on the discussion of the experimental results, this phenomenon is found to be connected to the anisotropic microstructure of the discontinuous shear-thickening suspension and the geometrical properties of the convergent nozzle.

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Analysis Methods for Direct Numerical Simulations of Primary Breakup of Shear-Thinning Liquid Jets

Cited by 16 publications

References 0 publications

Primary breakup of shear‐thickening suspension jet by an annular air jet

Primary breakup of shear‐thickening suspension jet by an annular air jet

Interactive Visualization of Droplet Dynamic Processes

Inhibitory Effects of Convergent Annular Nozzles on the Primary Breakup of Discontinuous Shear-Thickening Suspensions

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