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  On the applicability of Drop Profile Analysis Tensiometry at high flow rates using an interface tracking method

Dieter-Kissling, K., Karbaschi, M., Marschall, H., Javadi, A., Miller, R., & Bothe, D. (2014). On the applicability of Drop Profile Analysis Tensiometry at high flow rates using an interface tracking method. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 441, 837-845. doi:10.1016/j.colsurfa.2012.10.047.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-3A11-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0025-06E2-9
Genre: Journal Article

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 Creators:
Dieter-Kissling, Kathrin1, Author
Karbaschi, Mohsen2, Author              
Marschall, Holger1, Author
Javadi, Aliyar2, Author              
Miller, Reinhard2, Author              
Bothe, Dieter1, Author
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1external, ou_persistent22              
2Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863501              

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 Abstract: In this work studies of growing water droplets in air are presented, with the aim to assess the applicability limit of the Droplet Profile Analysis Tensiometry (PAT). High inflow rates are applied for systems containing surfactants with high adsorption rates. However, under dynamic formation conditions, the measured surface tension values deviate from the theoretical values even for pure systems. Therefore, Computational Fluid Dynamics (CFD) is applied to gain detailed insight into the hydrodynamics of the growing drop. Since the flow is dominated by surface tension forces, an interface tracking approach is applied, which is able to capture the flow in a physically correct way. At high flow rates the inflow jet is not fully dissipated before approaching the free surface. Therefore, the pressure profile inside the drop is not uniform as is required in the derivation of the Gauss Laplace equation. The shape of the drop no longer represents the Gauss Laplace profile corresponding to the theoretical surface tension coefficient. As result we can confirm that the evaluation of surface tension by fitting to the Gauss Laplace Equation is not valid for dynamic droplet formations. Indications for future improvements of the evaluation procedure are provided. (C) 2012 Elsevier B.V. All rights reserved.

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 Dates: 2014
 Publication Status: Published in print
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Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 441 Sequence Number: - Start / End Page: 837 - 845 Identifier: ISSN: 0927-7757
CoNE: https://pure.mpg.de/cone/journals/resource/954925568771