Börnhorst, Marion

Deen, Niels G.

Deutschmann, Olaf

Homan, Tess A.M.

Rohlfs, Patrick

Wörner, Martin

English

Homan, Tess A. M.

KITopen

KIT – The Research University in the Helmholtz AssociationCutting of rising bubbles by a wire without contactConclusionsNumerical simulation, bottom view [6]Experimental recordings (side view)Formation of small satellite bubbles by fragmentation of a gas thread during bubble breakup[1] Höller et al., Ind. Eng. Chem. Res. 40 (2001) 1575−1579[2] Cai et al., Catalysis Today 273 (2016) 151−160[3] Q. Segers, PhD thesis, TU Eindhoven, 2015Contact:  Marion Börnhorst (marion.boernhorst@kit.edu)Institute for Chemical Technology and Polymer ChemistryEngesserstr. 20, 76131 Karlsruhe, GermanyM. Börnhorst1, T.A.M. Homan3, P. Rohlfs1, N.G. Deen3, O. Deutschmann1,2, M. Wörner21Karlsruhe Institute of Technology (KIT), Institute for Chemical Technology and Polymer (ITCP) 2Karlsruhe Institute of Technology (KIT), Institute of Catalysis Research and Technology (IKFT)3Eindhoven University of Technology, Power & Flow GroupP 1.06 MotivationBubble Volumes VB / µL 50, 250, 500, 1000Equivalent diameter / mm 4.6 - 12.4Eötvös number Eo / - 3.8 - 27.3Morton number Mo / - 0.0164Experiments with 90 wt.-% viscous glycerol-water solutionRecording of bubble cutting process by high-speed cameraResultsExperimental setup [3]wire / cylinderturnablespoonsyringeVariation of cylinder diameter dcand material (contact angle θ)dc = 3mm, 4mm, 5mmGlass θ ≈ 40°, Teflon θ ≈ 90°, hydrophobic coating θ ≈ 150°Image analysis with Matlab and ImageJ Separation of bubbles and cylinder by a uniform liquid film No influence of cylinder wettability on bubble cutting processVB = 250 µLθ = 150°θ = 40°VB = 1000 µLBubble size and velocity affect film thickness during cuttingFormation of satellite bubbles during breakup of large bubblesBubble cutting at various conditions (dc = 4mm)Annual Meeting on Reaction Engineering 2019together with subject division Multiphase FlowsWürzburg, Germany, May 27 – 29, 2019Numerical simulations predict strong effect of contact angle θ on bubble breakup behavior [2]Widespread use of bubble columns in industry with high optimization potential Installation of internals in the reactorto break up the bubbles  Increase of the interfacial area Increase of heat and mass transferWhat is the influence of wire material on bubble breakup in reality?Use of wire meshes as catalyst carriers [1]Increasing film thickness with VB [5]Experiments[4] Aoyama et al., Int. J. Multiphase Flow 79 (2016), 23 −30[5] P. Rohlfs, Bachelor thesis, KIT, 2018[6] S. Wang, Master thesis, KIT, 20194.6 5.86.6 7.8 9.8 12.40.00.20.40.60.81.0 experiment simulationFilm thickness dF / mmdeq / mm50 100150 250 500 1000BVB / µL1006.wireθ = 150°0 500 1000 1500 2000 25000.20.30.40.50.60.70.80.91.0Aspect ratioEo1.12Re Aoyama et al. [4] measurementsθ = 60°

Cutting of rising bubbles by a wire without contact

https://publikationen.bibliothek.kit.edu/1000095490/30929923

Cutting of rising bubbles by a wire without contact

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