mod_eprivacy

Investigation of the behavior of supercooled droplets concerning evaporation, condensation and freezing at different boundary conditions

Description

In the project TP-B1 investigations of droplet behavior in supercooled clouds are conducted. This means that ambient temperatures in clouds are below the freezing point of water. The droplets in these clouds can still be liquid and supercooled despite the low temperatures. Furthermore, frozen droplets and ice crystals can already be found. Emphasis is put on the interaction of liquid droplets and frozen drops as well as ice crystals. Evaporation, sublimation and freezing processes play a key role for the development of clouds and thus for the weather. These processes are also influenced by strong electric fields occurring in thunderclouds.

Against this background basic experiments and direct numerical simulations (DNS) are conducted in subproject TP-B1. The experimental studies are run with single drops in an observation chamber. The drops are optically levitated or fall down along a vertical laser beam. With the help of scattered laser light evaporation and sublimation of supercooled droplets is investigated. Studies on homogeneous and heterogeneous freezing of droplets complete the investigations of the drop dynamic processes. Ambient conditions, such as temperature, humidity and electric field can be varied.

For numerical simulations the in-house code FS3D is used. With this software package Direct Numerical Simulations of processes with single drops or very small groups of drops are conducted. For this, extension of the program is required. In this subproject all further developments of the FS3D code are coordinated, supervised and implemented. In addition to the simulation of supercooled drops of TP-B1 and TP-C3 the developments are: the transition to the compressible flow regime in cooperation with TP-A2 and TP-A3, the consideration of electromagnetic fields in cooperation with TP-A5 and studies of the three phase contact line with TP-C1. Thus FS3D is the major calculation software of the SFB-TRR 75.

The experiments and direct numerical simulations of TP-B1 promote on the one hand, the physical understanding of droplet dynamics. On the other hand they enable the development of models that are implemented in other software packages of the SFB-TRR 75, such as OpenFOAM. With OpenFOAM it is finally possible to describe complete systems.

Team

Prof. Dr.-Ing. habil. Bernhard Weigand

Prof. Dr.-Ing. habil. Bernhard Weigand

Chairman | Spokesman | Director subarea B1 This email address is being protected from spambots. You need JavaScript enabled to view it. +49 711 685-63590
Dipl.-Ing. Jonathan Reutzsch

Dipl.-Ing. Jonathan Reutzsch

B1 This email address is being protected from spambots. You need JavaScript enabled to view it. +49 711 685-62314
Verena Kunberger

Verena Kunberger

B1 This email address is being protected from spambots. You need JavaScript enabled to view it. +49 711 685-62636
110114260

Publications

2017

S. Ruberto, J. Reutzsch, N. Roth and B. Weigand:
A systematic experimental study on the evaporation rate of supercooled water droplets at subzero temperatures and varying relative humidity;
Experiments in Fluids; (2017). http://dx.doi.org/10.1007/s00348-017-2339-5

M. Reitzle, C. Kieffer-Roth, H. Garcke, B. Weigand:
A volume-of-fluid method for three-dimensional hexagonal solidification processes;
Journal of Computational Physics 339, pp. 356–369 http://dx.doi.org/10.1016/j.jcp.2017.03.001

Karch, G.K., Beck, F., Ertl, M., Meister, C., Schulte, K., Weigand, B., Ertl, T., Sadlo, F.:
Visual Analysis of Inclusion Dynamics in Two-Phase Flow,
IEEE Transactions on Visual Computing and Computer Graphics 99, 2017.

2016

S. Ruberto, J. Reutzsch, B. Weigand.
Experimental investigation of the evaporation rate of supercooled water droplets at constant temperature and varying relative humidity,
International Communications in Heat and Mass Transfer, Vol. 77, 2016, http://dx.doi.org/10.1016/j.icheatmasstransfer.2016.08.005

F. I. Dragomirescu, K. Eisenschmidt, C. Rohde, B. Weigand.
Perturbation solutions for the finite radially symmetric Stefan problem,
(2016, accepted to International Journal of Thermal Sciences).

Ruberto S., Weigand B., Stegmann P., Tropea C.:
Uncertainty quantification in the localisation of morphology dependent resonances.
11th International Conference on Laser-light and Interactions with Particles, Xi’an, China, 2016.

K. Eisenschmidt, M. Ertl, H. Gomaa, C. Kieffer-Roth, C. Meister, P. Rauschenberger, M. Reitzle, K. Schlottke, B. Weigand.
Direct numerical simulations for multiphase flows: An overview of the multiphase code FS3D.
Appl.Math. Comput. 272: 508–517, 2016.

2015

P. Rauschenberger, B. Weigand.
Direct numerical simulation of rigid bodies in multiphase flow within an Eulerian framework,
Journal of Computational Physics, No. 291, 2015.

P. Rauschenberger, B. Weigand.
A Volume-of-Fluid method with interface reconstruction for ice growth in supercooled water,
Journal of Computational Physics, No. 282, 2015.

S. Ruberto,
Experimentelle Untersuchung von Phasenübergängen an unterkühlten freien Tropfen,
Institut für Thermodynamik der Luft- und Raumfahrt, Universität Stuttgart, Milestone Report Graduiertenschule SimTech, 2015.

2014

P. Rauschenberger, A. Birkefeld, M. Reitzle, C. Meister, B. Weigand.
A Parallelized Method for Direct Numerical Simulations of Rigid Particles in Multiphase Flow.
High Performance Computing in Science and Engineering ’14, 2014

2012

Rauschenberger, P.; Schlottke, J.; Weigand, B.
A Computation Technique for Rigid Particle Flows in an Eulerian Framework Using the Multiphase DNS Code FS3D.
High Performance Computing in Science and Engineering '11 (eds.: W.E. Nagel, D.B. Kröner, M. Resch), Springer, 2012

2011

Eisenschmidt, K.; Rauschenberger, P.; Weigand, B.
Freezing Processes in Supercooled Droplets in Clouds: A Multiple VOF Variable Approach.
ILASS - Europe 2011, 24th European Conference on Liquid Atomization and Spray Systems, Estoril, Portugal, 2011

Schlottke, J.; Rauschenberger, P.; Weigand, B.; Ma, C.; Bothe, D.
Volume of Fluid Direct Numerical Simulation of Heat and Mass Transfer using Sharp Temperature and Concentration Fields.
ILASS - Europe 2011, 24th European Conference on Liquid Atomization and Spray Systems, Estoril, Portugal, 2011

Rauschenberger, P.; Schlottke J.; Eisenschmidt, K.; Weigand, B.
Direct Numerical Simulation of Multiphase Flow with Rigid Body Motion in Eulerian Framework.
ILASS - Europe 2011, 24th European Conference on Liquid Atomization and Spray Systems, Estoril, Portugal, 2011

2010

Rauschenberger, P.; Gomaa, H.; Weigand, B.
A computation technique for rigid particle flows using the multiphase DNS code FS3D.
12th Workshop on Two-Phase Flow Predictions, Halle (Saale), Germany, 2010

Wednesday, November 13, 2019