EXP 1-4 Experimental Set Up: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
|||
| (46 intermediate revisions by 2 users not shown) | |||
| Line 1: | Line 1: | ||
=Axisymmetric drop impact dynamics on a wall film of the same liquid= | =Axisymmetric drop impact dynamics on a wall film of the same liquid= | ||
{{ | {{EXPHeader | ||
|area=1 | |area=1 | ||
|number=4 | |number=4 | ||
| Line 7: | Line 7: | ||
__NOTOC__ | __NOTOC__ | ||
= Experimental Setup= | = Experimental Setup= | ||
The experimental setup can be divided into three | The experimental setup shown in Fig. 3 can be divided into three | ||
main units including the drop generator, the impact substrate and the | main units including the drop generator, the impact substrate and the | ||
observation system. | observation system. | ||
The '''drop generator''' is based on a drop on demand method. A micropump | * 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. | ||
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. The | * 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. | ||
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 | * The '''observation system''' is described in [[EXP 1-4 Measurement Quantities and Techniques]]. There, also a suitable setup for CFD calculations is given. | ||
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 | [[File:TRR150-Fig-Setup.png|400px|thumb|center|Fig. 3: Schematic representation of the experimental setup.]] | ||
CHRocodile CLS) which allows measuring the film thickness on 192 | |||
points aligned on a line of 1 mm length, to assure uniform film thickness. | |||
<br/> | <br/> | ||
---- | ---- | ||
{{ACContribs | {{ACContribs | ||
|authors=Bastian Stumpf | |authors=Milad Bagheri, Bastian Stumpf, Ilia V. Roisman, Cameron Tropea, Jeanette Hussong, Martin Wörner, Holger Marschall | ||
|organisation=Technical University of Darmstadt and Karlsruhe Institute of Technology | |organisation=Technical University of Darmstadt and Karlsruhe Institute of Technology | ||
}} | }} | ||
{{ | {{EXPHeader | ||
|area=1 | |area=1 | ||
|number=4 | |number=4 | ||
Latest revision as of 10:01, 17 August 2023
Axisymmetric drop impact dynamics on a wall film of the same liquid
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.
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
© copyright ERCOFTAC 2024