A draft tube to improve mixing in swirling flow-based solid–liquid mixing reactors

Yang, Zhu; Holemans, Thomas; Lagrain, Bert; Sels, Bert; Vanierschot, Maarten

doi:10.1016/j.cherd.2024.05.005

Chemical Engineering Research and Design

2024

DOI: 10.1016/j.cherd.2024.05.005

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A draft tube to improve mixing in swirling flow-based solid–liquid mixing reactors

Zhu Yang,

Thomas Holemans,

Bert Lagrain

et al.

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Cited by 1 publication

References 55 publications

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Swirl-induced hysteresis in a sudden expansion flow

Holemans,

Yang,

De Greef

et al. 2024

Physics of Fluids

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Swirling sudden expansion flows are complex flow fields containing several coherent structures that depend on the swirl number and can exhibit hysteresis behavior between increasing and subsequently decreasing swirl levels. While these flows have extensively been studied in simple geometries, results involving special designed nozzles are scarce. Therefore, this paper aims to provide insights into a more complex geometry, specifically a two-step conical expansion with a converging outlet. Experimental data is acquired for changing swirl numbers at a Reynolds number in the range of 35, 000. Stereoscopic Particle Image Velocimetry is employed to characterize downstream flow structures, while Laser Doppler Velocimetry is used to characterize upstream structures and to determine the inlet swirl number. Several distinct flow patterns are found as a function of the swirl number and the identified flow patterns include, in order of increasing swirl, a Closed Jet Flow, an Open Jet Flow (OJF), and a Coandã Jet Flow (CoJF). A central positive axial velocity is noted for both OJF and CoJF downstream of the expansion due to the converging outlet geometry. At higher swirl numbers, Vortex Breakdown moves upstream into the nozzle until a negative axial velocity is noted in the inlet tube. For these higher swirl numbers, no hysteresis is observed in the inlet tube between increasing and subsequently decreasing swirl. However, downstream of the nozzle, it is observed that the CoJF detaches at a lower swirl number than the swirl number required for attachment, indicating a hysteresis effect between in- and decreasing swirl.

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Swirl-induced hysteresis in a sudden expansion flow

Holemans,

Yang,

De Greef

et al. 2024

Physics of Fluids

View full text Add to dashboard Cite

show abstract

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A draft tube to improve mixing in swirling flow-based solid–liquid mixing reactors

Cited by 1 publication

References 55 publications

Swirl-induced hysteresis in a sudden expansion flow

Swirl-induced hysteresis in a sudden expansion flow

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