Dedicated to Prof. Dr. Thomas Hirth on the occasion of his 60th birthdayExperiments and simulations are presented for the interaction of single bubbles rising in a viscous liquid against a horizontal cylinder (Ø = 4 mm) of varying wettability. The slide-off of small and the cutting of larger bubbles into two daughter bubbles observed in the experiment are reproduced by phase-field simulations. It is shown that in the entire process bubble and cylinder are separated by a liquid film, which eliminates any influence of cylinder wettability. Before the mother bubble splits, a thinning gas thread develops below the cylinder. The rupture of this gas thread can lead to a different number of satellite bubbles depending on the conditions.
Non-fossil fuels are urgently needed for maritime and inland shipping applications to mitigate the sector's adverse impact on the global climate. This study investigates the performance of potassium borohydride (KBH 4 ) as an alternative, carbon-free energy carrier on the basis of detailed process simulations of the overall energy storage cycle in Aspen Plus . After optimizing the individual on-board and off-board process steps, the feasibility of installing a KBH 4 -based energy supply system on board of an inland-waterway cargo vessel is evaluated and critical process steps are highlighted along with current research challenges.
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