Vector Flow Imaging of a Highly Laden Suspension in a Zinc-Air Flow Battery Model

Kupsch, Christian; Weik, David; Feierabend, Lukas; Nauber, Richard; Büttner, Lars; Czarske, Jürgen

doi:10.1109/tuffc.2019.2891514

Cited by 9 publications

(9 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, this enabled the size of the required electrolyte and storage tank to be decreased dramatically, leading to an increase in energy density of the cell 26 . Further, Kupsch et al 27,28 introduced a new method for characterizing local flow conditions in a highly laden zinc suspension used for a ZAFB; thereby, increasing the accuracy of measurements. To prevent dendrite formation during the charging mode of ZAFBs, a trapezoidal structure or a permanent magnet parallel to an anode has been proposed 29 .…”

Section: Background and Summarymentioning

confidence: 99%

Discharge profile of a zinc-air flow battery at various electrolyte flow rates and discharge currents

Abbasi¹,

Hosseini²,

Somwangthanaroj³

et al. 2020

Sci Data

View full text Add to dashboard Cite

Nowadays, due to global warming stemming from excessive use of fossil fuel, there is considerable interest in promoting renewable energy sources. However, because of the intermittent nature of these energy sources, efficient energy storage systems are needed. In this regard, zinc-air flow batteries (ZAFBs) are seen as having the capability to fulfill this function. In flow batteries, the electrolyte is stored in external tanks and circulated through the cell. This study provides the requisite experimental data for parameter estimation as well as model validation of ZAFBs. Each data set includes: current (mA), voltage (V), capacity (mAh), specific capacity (mAh/g), energy (Wh), specific energy (mWh/g) and discharge time (h:min:s.ms). Discharge data involved forty experiments with discharge current in the range of 100-200 mA, and electrolyte flow rates in the range of 0-140 ml/min. Such data are crucial for the modelling and theoretical/experimental analysis of ZAFBs.

show abstract

Section: Background and Summarymentioning

confidence: 99%

Discharge profile of a zinc-air flow battery at various electrolyte flow rates and discharge currents

Abbasi¹,

Hosseini²,

Somwangthanaroj³

et al. 2020

Sci Data

View full text Add to dashboard Cite

show abstract

“…Ultrasound Image Velocimetry (UIV) is based on the correlation of local intensity distributions [1]. Interrogation windows of subsequent planar 2D-images are being correlated.…”

Section: Image Velocimetrymentioning

confidence: 99%

“…Usually, window sizes of multiple wavelengths are necessary. It thus has a lower spatial resolution than UDV, but is not as sensitive to wavefront distortions as UDV [1].…”

Section: Image Velocimetrymentioning

confidence: 99%

“…3. The used Doppler frequency estimation with autocorrelation is sensitive to wavefront distortions in the medium [1]. The distortions occur more likely, when the wavefront passes more particles, leading to an increasing systematic deviation.…”

Section: Systematic Deviationmentioning

confidence: 99%

“…Ultrasound flow imaging in narrow channels is a promising technique for the application in battery cells [1], crystal growth [2] or for fundamental research in the field of magnetohydrodynamics (MHD) [3] that use opaque fluids. The ultrafast method with the linear phased array adaptive focussing allows imaging of turbulent vector flow profiles.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Uncertainty comparison of velocity estimators for ultrasound flow imaging in narrow channels / Messunsicherheitsvergleich von Geschwindigkeitsschätzern der Ultraschallströmungsbildgebung in schmalen Kanälen

Weik

Kupsch

Nauber

et al. 2019

Tm - Technisches Messen

Self Cite

View full text Add to dashboard Cite

Ultrasound Imaging with a linear phased array allows measuring turbulent vector profiles in two dimension with two components (2D2C). This is interesting in narrow channels for the application in battery cells or research in magnetohydrodynamics (MHD), where the access to the opaque fluid is often restricted. There are two main velocity estimation methods applicable: the Ultrasound Doppler Velocimetry (UDV) or the Ultrasound Image Velocimetry (UIV). In this work, these methods were evaluated by their attainable measurement uncertainty for the application in narrow channels, where the acquisition of the lateral velocity component is crucial. With a calibration rig, UIV could achieve a total measurement uncertainty of 9.9% and UDV 17.6%. As UIV reaches a 44% lower measurement uncertainty, it is the preferential method to measure lateral flows in narrow channels. In future work, the calibration rig will be adapted to optimize and characterize the flow instrumentation in opaque liquid metals.

show abstract

Ultrasound imaging velocimetry in particle-laden flows: counteracting attenuation with correlation averaging

et al. 2022

View full text Add to dashboard Cite

Ultrasound imaging velocimetry (UIV) refers to the technique wherein ultrasound images are analysed with 2D cross-correlation techniques developed originally in the framework of particle image velocimetry. Applying UIV to opaque, particle-laden multiphase flows have long been considered to be an attractive prospect. In this study, we demonstrate how fundamental differences in acoustical imaging, as compared to optical imaging, manifest themselves in the 2D cross-correlation analysis. A chief point of departure from conventional particle image velocimetry is the strong variation in the intensity profile of the acoustic wavefield, primarily caused by the attenuation of ultrasonic waves in particle-laden flows. Attenuation necessitates using a larger ensemble of correlation planes to obtain satisfactory time-averaged velocity profiles. For a given combination of imaging and flow conditions, attenuation sets upper limits on volume fraction, penetration depth, as well as temporal resolutions that may be accessed confidently. This behaviour is demonstrated in two experimental datasets and is also supported by a modified cross-correlation theory. The modification is brought about by incorporating a lumped model of ultrasonic backscattering in suspensions into existing spatial cross-correlation analysis. The two experimental datasets correspond to two distinct particle-laden pipe flows: (1) a neutrally buoyant non-Brownian suspension in a laboratory-scale flow facility, wherein particle sizes are comparable to the ultrasonic wavelength and (2) a non-Newtonian slurry in an industrial-scale flow facility, wherein particle sizes are much smaller than the ultrasonic wavelength. We illustrate how and to what extent correlation averaging can counteract the adversity caused by attenuation. The work herein offers a template for one to evaluate the performance of UIV in particle-laden flows. Graphical abstract

show abstract

Vector Flow Imaging of a Highly Laden Suspension in a Zinc-Air Flow Battery Model

Cited by 9 publications

References 41 publications

Discharge profile of a zinc-air flow battery at various electrolyte flow rates and discharge currents

Discharge profile of a zinc-air flow battery at various electrolyte flow rates and discharge currents

Uncertainty comparison of velocity estimators for ultrasound flow imaging in narrow channels / Messunsicherheitsvergleich von Geschwindigkeitsschätzern der Ultraschallströmungsbildgebung in schmalen Kanälen

Ultrasound imaging velocimetry in particle-laden flows: counteracting attenuation with correlation averaging

Contact Info

Product

Resources

About