The project encompasses experiments running during parabolic flights and in laboratories. The aim is to study droplet formation and coalescence in the low gravity environment of the International Space Station as part of a future ESA mission.
When drops collide
On Earth, gravity complicates drop formation. When a liquid falls or drips, gravity pulls it downward and affects the way the drop forms. Instead of a simple, perfectly spherical shape, gravity causes the drop to elongate or flatten out as it falls. Monitoring how drops behave in a weightless environment could lead to a better understanding of this phenomenon.
The Dropcoal system is a hardware device built by Romanian InSpace Engineering - on behalf of ESA. It is designed to facilitate such experiments in zero gravity. To ensure it can hold up in space, the construction and reliable functioning of the device needed to be examined first. Scientists from Romania, Germany, and the USA developed an experiment to test the device during ESA's 79th Parabolic Flight in October 2022.
Two's a company...
The Dropcoal device was not alone on that flight. A German aerospace centre DLR experiment was also loaded on to the Airbus 310 Zero Gravity aircraft, focusing on how two droplets approach, as well as the first moments when they merge.
Within the aircraft's experimental rack, both the ESA and DLR experiments operated independently. The core components of ESA's experimental setup were three syringes attached to a syringe driver. This allowed to create spherical droplets on the tip of eight needles.
Next stop: Space Station
Following the results from the parabolic flight, Dropcoal experiments are set to run on the Space Station as part of an ESA mission in 2024. This will allow for the long-term investigation of droplet formation in zero gravity.
Europe's Columbus module will host the experiments in the ICE Cubes facility. There, drops will collide head on. To monitor how the drops interact and merge, an optical instrument equipped with a high-speed camera will capture frame-by-frame images.
All Dropcoal experiments on the Space Station will be controlled from Earth, bringing the wonders of droplet dynamics within our grasp.
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