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Authors
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Depp, B. C.; Rostami, P.; Heinbücher, M.; Wang, Q.; Auernhammer, G. K.; Pelz, P. F.
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Title
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Effects of surface wettability on bubble departure in liquid cross-flow
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Date
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02.11.2025
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Number
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0
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Abstract
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Bubble departure from walls in cross-flow conditions has been studied. This process plays a fundamental role in numerous applications, from gas-liquid contacting, heterogeneous nucleation in cavitation, to flow boiling. Predicting the size of the detaching bubble is essential for controlling the liquid–gas interfacial area in gas/liquid systems encountered in these applications. However, existing data on bubble departure in cross-flow are often restricted to low wall shear rates where bubble deformation is minor and thus negligible. Moreover, the effect of surface wettability on bubble departure is usually not reported in detail. Therefore, in this study, we analyse bubble deformation and departure from artificial nucleation sites for elevated wall shear rates using high-speed imaging. In addition, the surface wettability was modified and quantities related to dynamic wetting phenomena were examined. Our findings clearly show that wettability of the surface and the dynamic pressure imposed on the bubble by the flow jointly dictate how a bubble deforms prior to departure and how large its size is on departure. In addition, different mechanisms of departure are identified and reported in a regime map based on the critical deformation and the wall shear rate.
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Publisher
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Springer Nature
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Wikidata
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Citation
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Experiments in Fluids 66 (2025) 210
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DOI
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https://doi.org/10.1007/s00348-025-04133-7
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