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Droplet impact: compressibility and wetting effects

Rein, Martin (2009) Droplet impact: compressibility and wetting effects. Opening Symposium: Christian Doppler Laboratory for Cavitation and Microerosion, 19. Oktober - 19. Oktober 2009, Göttingen, Deutschland.

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Kurzfassung

High-speed impacts of droplets are well-known to cause serious erosion to surfaces. One reason are high pressures occurring on impact. The importance of shock waves for the generation of extreme pressure peaks will be explained based on a classical shock polars approach for the case of liquid-liquid impacts. After impact, expansion waves propagating within the droplet may result in the formation of cavitation bubbles whose collapse can also contribute to erosion. At low velocities droplets impinging on a dry solid surface can spread on the surface or splash. It is shown that critical conditions of splashing inception, the so-called splashing threshold, have often been obtained under slightly different experimental conditions and are partly contradictory. Furthermore, no general agreement on the basic physical mechanism causing splashing does exist. After considering those parameters that are likely to govern splashing in a dimensional analysis, limiting conditions of splashing are re-evaluated. Information drawn from these considerations is used to distinguish between different splashing thresholds. For smooth surfaces there is evidence that the wetting behaviour of the liquid plays an important role for the inception of splashing. A mechanism causing the onset of splashing on smooth surfaces is proposed that may also explain the well-known fingering of the liquid lamella formed after impact.

elib-URL des Eintrags:https://elib.dlr.de/60372/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Droplet impact: compressibility and wetting effects
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Rein, Martinmartin.rein (at) dlr.dehttps://orcid.org/0000-0002-2670-2815NICHT SPEZIFIZIERT
Datum:19 Oktober 2009
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Stichwörter:shock wave, shock polar, erosion, spreading, splashing, wetting, air entrainment
Veranstaltungstitel:Opening Symposium: Christian Doppler Laboratory for Cavitation and Microerosion
Veranstaltungsort:Göttingen, Deutschland
Veranstaltungsart:Andere
Veranstaltungsdatum:19. Oktober - 19. Oktober 2009
Veranstalter :Christian Doppler Laboratory for Cavitation and Microerosion, Drittes Physikalisches Institut, Universität Göttingen
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Drehflügler (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L RR - Drehflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Der militäisch spezialisierte Drehflügler (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Hochgeschwindigkeitskonfigurationen
Hinterlegt von: Rein, Prof.Dr. Martin
Hinterlegt am:23 Okt 2009 09:51
Letzte Änderung:23 Jan 2024 15:08

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