EXP 1-4 Description

Axisymmetric drop impact dynamics on a wall film of the same liquid

Front Page

Introduction

Review of experimental studies

Description

Experimental Set Up

Measurement Quantities and Techniques

Data Quality and Accuracy

Measurement Data and Results

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) and 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. The drop velocity U is varied from 1 to 3 m/s. Accordingly, the Weber number We = ρDU²/σ is in the range 78 – 702 while the Reynolds number Re = DU/ν is in the range 300 – 900.

Investigated drop impact velocities

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

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Contributed by: Milad Bagheri, Bastian Stumpf, Ilia V. Roisman, Cameron Tropea, Jeanette Hussong, Martin Wörner, Holger Marschall — Technical University of Darmstadt and Karlsruhe Institute of Technology

Front Page

Introduction

Review of experimental studies

Description

Experimental Set Up

Measurement Quantities and Techniques

Data Quality and Accuracy

Measurement Data and Results

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