mod_eprivacy

Interaction of a single drop with a heated wall at high ambient pressures

Description

In this project the drop impact on walls at high wall temperatures and high ambient pressures is investigated. These conditions can be found in technical applications like in internal combustion of engines or gas turbines, where the single drop impact is an important part of the spray / wall interaction. In describing and modeling of spray impacts under these extreme conditions understanding of the drop impact is a necessary knowledge.

The ambient pressure has a significant impact on the rate of evaporation and the saturation temperature of an impacting drop. It can affect the Leidenfrost temperature as well as the acceleration of the drop perpendicular to the wall and thus the parameters of secondary break-up processs. Currently no systematic or comprehensive description of the influence of pressure on the drop impact exists in the literature.

In this subproject individual drops are produced by a drop generator within a pressure chamber. The droplets fall accelerated by gravity onto a heated target. This process is to be recorded with a high-speed camera system. At the same time the thickness of the vapor layer between the impact plate and the drop is measured with a far-field microscope. In case of the droplet impacting onto the wall, this high-resolution visualization is also suitable for the measurement of contact angles. The resulting secondary drops are to be captured with the aid of either a phase Doppler interferrometer or with the Interferometric Particle Imaging (IPI) technique.

The focus of the experimental part of the research is on the impact of ambient pressure (as well as several other factors such as impact parameters, properties of the liquid and the target, etc ..), onto the break-up limit, the Leidenfrost temperature, the dynamic contact angle, the shape of the drop impact and the parameters of the secondary spray.

The theoretical part of the study is the development of an analytical description of the flow, within the spreading drops and within the vapor layer as well as the description of the stability of this layer. This analysis will allow for the determination of the anticipated size and speed of the secondary drop. The long-term goal of this project is to develop a complete analytical model of the drop impact under extreme pressure conditions with phase change, including an analytical description of the droplet icing, the drop distribution inside an electric field and of the dynamic contact angle. The developed model will be implemented into a numerical code. Therefore the subproject is closely linked to several other subprojects of the SFB-TRR 75.

Team

Prof. Dr.-Ing. habil. Cameron Tropea

Prof. Dr.-Ing. habil. Cameron Tropea

Chairman | Director projectarea C | Director subarea C3/C4 This email address is being protected from spambots. You need JavaScript enabled to view it. +49 6151 16-22175
PD Dr.-Ing. habil. Ilia Roisman

PD Dr.-Ing. habil. Ilia Roisman

Director subarea C4 This email address is being protected from spambots. You need JavaScript enabled to view it. +49 6151 16-22173
Johannes Benedikt Schmidt, M.Sc.

Johannes Benedikt Schmidt, M.Sc.

C4 This email address is being protected from spambots. You need JavaScript enabled to view it. +49 6151 16-22192
143144204

Video Gallery

Publications

2017

Breitenbach, J., Roisman, I. V. and Tropea, C.:
Drop collision with a hot, dry solid substrate: Heat transfer during nucleate boiling.
Phys. Rev. Fluids 2: 074301, (2017).
http://dx.doi.org/10.1103/PhysRevFluids.2.074301

Breitenbach, J., Roisman, I.V. and Tropea, C.:
Thermal atomization of an impacting drop onto a hot substrate: Characterization of secondary droplets.
International Conference in Aerospace for Young Scientists, Beijing, China, (2017).

Roisman, I.V., Breitenbach, J.and Tropea, C.:
Thermal atomisation of a liquid drop after impact onto a hot substrate, caused by thermal dewetting and disintegration of a levitated lamella.
Journal of Fluid Mechanics, (submitted to JFM June 2017).

Kissing, J.:
Experimentelle Untersuchung der Eigenschaften von Sekundärtropfen beim Aufprall eines Tropfen auf eine beheizte Oberfläche.
Technische Universität Darmstadt, Masterarbeit, (2017).

Reitter, L., Liu, M., Breitenbach, J., Huang, K.-L., Bothe, D., Brenn G., Pan, K.-L, Roisman, I.V. and Tropea, C.:
Experimental and computational investigation of binary drop collisions under elevated ambient pressure.
28th Conference on Liquid Atomization and Spray Systems, ILASS–Europe, Valencia, Spain, September, (2017).

Breitenbach, J., Roisman, I.V. and Tropea, C.:
Single drop impact and spray cooling in the film boiling regime.
9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, Iguazu Falls, Brazil, June, (2017).

Roisman, I.V., Breitenbach, J. and Tropea, C.:
Drop impact onto a hot, dry solid substrate: heat transfer during nucleate boiling.
9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, Iguazu Falls, Brazil, June, (2017).

Breitenbach, J., Roisman, I.V., and Tropea, C:
Water drop impact onto a hot surface: heat transfer in the nucleate boiling regime.
29th Annual Conference on Liquid Atomization and Spray Systems, ILASS-Americas, Atlanta, USA, May, (2017)

Schremb, M., Borchert, S., Berberovic, E., Jakirlica, S., Roisman, Ilia V., and Tropea, C.:
Computational modelling of flow and conjugate heat transfer of a drop impacting onto cold wall.
Int. J. Heat Mass Transf. 109: 971-980, (2017).
http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.02.073

Breitenbach, J., Roisman, I. V. and Tropea, C.:
Heat transfer in the film boiling regime: Single drop impact and spray cooling.
Int. J. Heat Mass Transf. 110: 34-42, (2017).
http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.03.004

Batzdorf, S., Breitenbach, J., Schlawitschek, C., Roisman, I. V., Tropea, C., Stephan, P., and Gambaryan-Roisman, T.:
Heat transfer during multiple drop impacts onto a hot solid substrate.
Int. J. Heat Mass Transf. 113: 898-907, (2017).
https://doi.org/10.1016/j.ijheatmasstransfer.2017.05.091

Yarin, A.L, Roisman, I.V., Tropea, C.:
Collision Phenomena in Liquids and Solids,
Cambridge University Press, Cambridge, UK, ISBN-13: 978-1107147904, (2017).
https://doi.org/10.1017/9781316556580

2016

Breitenbach, J., Roisman, I.V., and Tropea, C:
Drop Impact on Hot Surfaces: Effect of Surface Morphology (Poster).
30th Conference of The European Colloid and Interface Society, Rome, Italy, September, (2016).

Breitenbach, J., Roisman, I.V., and Tropea, C:
Phenomena of Drop Impact on Hot Surfaces.
9th International Conference on Multiphase Flow - ICMF 2016, Firenze, Italy, May, (2016).

Reitter, L.:
Entwicklung eines Prüfstands zur Untersuchung der binären Tropfenkollision unter erhöhtem und reduziertem Umgebungsdruck.
Technische Universität Darmstadt, Bachelorarbeit, (2016).

2015

Breitenbach, J., Roisman, I.V., Tropea, C:
Phenomena of Drop Impact on Hot Surfaces;
Proc. of 13th Triennial International Conference on Liquid Atomization and Spray Systems – ICLASS 2015, Tainan, Taiwan, August, (2015).

Breitenbach, J., Roisman, I.V., Tropea, C:
Phenomena of drop impact on hot surfaces: Pure Newtonian liquids (Poster).
6th International Workshop on Bubble and Drop Interfaces, Potsdam, Germany, July, (2015).

Breitenbach, J., Roisman, I.V., Tropea, C:
Phenomena of Drop Impact on Hot Surfaces: Pure Newtonian liquids and emulsions (Poster).
Conference of the International Association of Colloid and Interface Scientists, Mainz, Germany, May, (2015).

2014

Buchmüller, I:
Influence of pressure on Leidenfrost effect
Ph.D. thesis, TU Darmstadt, Darmstadt (2014)

2013

Dawi A. H., Buchmüller, I, Herbert S., Roisman, I. V., Gambaryan-Roisman, T., Stephan, P. Tropea, C.
Investigation of drop impact onto heated surfaces under high ambient pressure
25th European Conference on Liquid Atomization and Spray Systems, Chania Crete, Greece (2013)

Roth, N., Mercadé, C., Gomaa, H., Focke, C., Bothe,D., Roisman, I. V., Weigand, B.
Collision of droplets: experimental, analytical and numerical approach
25th European Conference on Liquid Atomization and Spray Systems, Chania Crete, Greece (2013)

2012

Buchmüller, I.; Roisman, I. V.; Tropea, C.
Influence of Elevated Pressure on Impingement of a Droplet Upon a Hot Surface.
Proceedings of the ICLASS 2012, Heidelberg, 2012

Schäfer, T.
Experimentelle Untersuchung des Leidenfrost-Effektes beim Aufprall von Einzeltropfen auf heiße Oberflächen unter erhöhtem Umgebungsdruck.
Bachelorarbeit, TU Darmstadt, 2012

Roisman, I. V., Planchette, C., Lorenceau, E., Brenn, G.
Binary collisions of drops of immiscible liquids
J. Fluid. Mech. 690 (2012), 512-535

2011

Marengo, M.; Antonini, C.; Roisman, I. V.; Tropea, C.
Drop collisions with simple and complex surfaces.
Current Opinion in Colloid and Interface Science, 16(4), 292-302, 2011

Weickgenannt, C. M.; Zhang, Y.; Lembach, A. N.; Roisman, I. V.; Gambaryan-Roisman, T.; Tropea, C.
Non-Isothermal drop impact and evaporation on polymer nanofiber mats.
Phys. Rev. E, 2011

Weickgenannt, C. M.; Zhang, Y.; Sinha-Ray, S.; Roisman, I. V.; Gambaryan-Roisman, T.; Tropea, C.
Inverse-Leidenfrost phenomenon on nanofiber mats on hot surfaces.
Phys. Rev. E, 2011

Criscione, A., Röhrig, R., Roisman, I.V., Jakirlic, S., Tropea, C.
Numerical investigation of impacting water drops in air cross-flow
4th European Conference on Liquid Atomization and Spray Systems, Estoril, Portugal, 2011

2010 und früher

Roisman, I. V.
Fast forced film spreading on a substrate: flow, heat transfer and phase transition
J. Fluid. Mech. 656 (2010), 189

Roisman, I. V., Horvat, K., Tropea, C.:
Spray impact: Rim transverse instability initiating fingering and splash, and description of a secondary spray.
Phys. Fluids 18: 102104, 2006.

Friday, November 15, 2019