EXP 1-4 Description: Difference between revisions
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The liquid used in the experiments is silicone oil (density ''ρ'' = 920 kg/m<sup>3</sup>, kinematic viscosity ''ν'' = 5 ⋅ 10<sup>-6</sup> m<sup>2</sup>/s, surface tension σ = 0.0177 N/m) while the ambient gas is air (density 1.2 kg/m<sup>3</sup>, kinematic viscosity 1.52 ⋅ 10<sup>-5</sup> m<sup>2</sup>/s). The film height ''h'' = 500 μm as well as the drop diameter ''D'' = 1.5 mm are kept fixed, resulting in the dimensionless film thickness ''δ'' = ''h''/''D'' = 0.33 and the Ohnesorge number ''Oh'' = 0.03, respectively. The drop velocity is varied from 1 to 3 m/s. Accordingly, the Weber number We = is in the range 78 – 702 while the Reynolds number ''Re'' = ''We''<sup>0.5</sup>/''Oh'' is in the range 300 – 900, see the Table below. | The liquid used in the experiments is silicone oil (density ''ρ'' = 920 kg/m<sup>3</sup>, kinematic viscosity ''ν'' = 5 ⋅ 10<sup>-6</sup> m<sup>2</sup>/s, surface tension ''σ'' = 0.0177 N/m) while the ambient gas is air (density 1.2 kg/m<sup>3</sup>, kinematic viscosity 1.52 ⋅ 10<sup>-5</sup> m<sup>2</sup>/s). The film height ''h'' = 500 μm as well as the drop diameter ''D'' = 1.5 mm are kept fixed, resulting in the dimensionless film thickness ''δ'' = ''h''/''D'' = 0.33 and the Ohnesorge number ''Oh'' = 0.03, respectively. The drop velocity ''U'' is varied from 1 to 3 m/s. Accordingly, the Weber number ''We'' = /''σ'' is in the range 78 – 702 while the Reynolds number ''Re'' = ''We''<sup>0.5</sup>/''Oh'' is in the range 300 – 900, see the Table below. | ||
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Revision as of 11:10, 2 June 2023
Axisymmetric drop impact dynamics on a wall film of the same liquid
Description of Study Test Case
This section should: * Convey the general set-up of the test case configuration (e.g. airflow over a bump on the floor of a wind tunnel) * Describe the geometry, illustrated by a sketch * Specify the flow parameters which define the flow regime (e.g. Reynolds number, Rayleigh number, angle of incidence etc.) * give the principal quantities of interest that were measured - these should include global parameters but also mean-flow and turbulence parameters. The description can be kept fairly short if reference can be made to a publication or a link to a data base where details are given. For other cases a more detailed, self-contained description should be provided.
The liquid used in the experiments is silicone oil (density ρ = 920 kg/m3, kinematic viscosity ν = 5 ⋅ 10-6 m2/s, surface tension σ = 0.0177 N/m) while the ambient gas is air (density 1.2 kg/m3, kinematic viscosity 1.52 ⋅ 10-5 m2/s). The film height h = 500 μm as well as the drop diameter D = 1.5 mm are kept fixed, resulting in the dimensionless film thickness δ = h/D = 0.33 and the Ohnesorge number Oh = 0.03, respectively. The drop velocity U is varied from 1 to 3 m/s. Accordingly, the Weber number We = /σ is in the range 78 – 702 while the Reynolds number Re = We0.5/Oh is in the range 300 – 900, see the Table below.
| Impact energy | Impact velocity | Weber number | Reynolds number |
|---|---|---|---|
| Low | 1 m/s | 78.0 | 300 |
| Moderate | 2 m/s | 311.9 | 600 |
| High | 3 m/s | 701.7 | 900 |
Further details on the test case can be found in the following publication:
M. Bagheri, B. Stumpf, I.V. Roisman, C. Tropea, J. Hussong, M. Wörner, H. Marschall, Interfacial relaxation – Crucial for phase-field methods to capture low to high energy drop-film impacts, Int. J. Heat Fluid Flow, 94 (2022) 108943, https://doi.org/10.1016/j.ijheatfluidflow.2022.108943
Contributed by: Bastian Stumpf, Milad Bagheri, Ilia V. Roisman, Cameron Tropea, Jeanette Hussong, Martin Wörner, Holger Marschall — Technical University of Darmstadt and Karlsruhe Institute of Technology
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