EXP 1-4 Experimental Set Up

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

Experimental Setup

The experimental setup shown in Fig. 3 can be divided into three main units including the drop generator, the impact substrate and the observation system.

• The drop generator is based on a drop on demand method. A micropump transports the liquid from a tank to the cannula. The drop drips off the cannula tip by gravity as soon as the critical mass is reached. A vertical tube reduces the influence of the air flow in the room on the trajectory of the falling drop, so that the point of impact remains reproducible. The impact velocity of the drop is varied by altering the height of the cannula tip relative to the liquid film interface.

• The impact substrate is an aluminum block with a recess of 70 mm diameter and 0.6 mm depth. The recess constrains the liquid so that films with a defined film thickness can be placed. The film thickness is measured by a chromatic line Sensor (Precitec CHRocodile CLS) which allows measuring the film thickness on 192 points aligned on a line of 1 mm length, to assure uniform film thickness.

• The observation system is described in EXP 1-4 Measurement Quantities and Techniques. There, also a suitable setup for CFD calculations is given.

Fig. 3: Schematic representation of the experimental setup.

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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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