This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility:


trusted source


Scientists prepare ISS experiment to study how droplets form in space

ESA—Droplets unite!
Functional units of ESA's Dropcoal experiment in the assembled experimental rack on board a parabolic flight. Credit: European Space Agency

Dropcoal, short for drop coalescence, is a research project that studies how droplets form in space and on Earth. The results will grant insights into raindrop and cloud formation, fuel combustion and interactions between materials, all with broad implications for industry and academy. They also play a crucial role in administering medicine to astronauts during lengthy and far-reaching space missions.

The project encompasses experiments running during 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 , 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 . To ensure it can hold up in , the construction and reliable functioning of the device needed to be examined first. Scientists from Romania, Germany, and the U.S. developed an experiment to test the device during ESA's 79th Parabolic Flight in October 2022.

The Dropcoal device was not alone on that flight. A German aerospace center 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: International 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 .

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.

Citation: Scientists prepare ISS experiment to study how droplets form in space (2023, August 29) retrieved 3 December 2023 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Watching water droplets merge on the International Space Station


Feedback to editors