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Spreading and rebound dynamics of sub-millimetre urea-water-solution droplets impinging on substrates of varying wettability

Wörner, Martin; Samkhaniani, Nima; Cai, Xuan; Wu, Yanchen; Majumdar, Arijit; Marschall, Holger; Frohnapfel, Bettina; Deutschmann, Olaf

Abstract (englisch):
The interaction of droplets consisting of urea-water solution (UWS) with a wall is of interest for automotive exhaust gas after-treatment of Diesel engines by selective catalytic reduction (SCR). Since the impingement of tiny UWS droplets on the solid substrate is difficult to examine experimentally, little is known about the detailed dynamics of this process. In the present study, the normal impact of single UWS droplets impinging on dry solid substrates of greatly differing wettability is investigated numerically under axisymmetric conditions. Simulations are performed by a diffuse interface phase-field solver developed by the authors where the coupled Cahn–Hilliard Navier–Stokes equations are solved using OpenFOAM. The code is thoroughly validated against a number of experiments from literature considering the rebound of millimetre-sized water droplets from hydrophobic substrates.

The numerical simulations on the impact dynamics of UWS droplets cover wide ranges of sub-millimetre droplet sizes and impact velocities that are relevant in technical SCR systems. A strong influence of substrate wettability on droplet dynamics is identified. ... mehr

Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2021
Sprache Englisch
Identifikator ISSN: 0307-904X
KITopen-ID: 1000130042
Erschienen in Applied mathematical modelling
Verlag Elsevier
Band 95
Seiten 53–73
Schlagwörter Drop bouncing Drop impact dynamics Phase field method Selective catalytic reduction Urea-water solution
Nachgewiesen in Scopus
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