July 10, 2015:
Astronauts on the International Space Station give up many pleasures to take those giant leaps in the name of science. They leave behind fresh vegetables, relaxing hot showers, warm sunshine, gently misting rain, and much more.
One of the things astronauts say they miss most is a good cup of coffee. How would YOU like to start your morning sucking freeze dried coffee through a straw from a sealed plastic bag?
Good news for astronauts: Morning Joe recently got an upgrade. On April 20th, SpaceX delivered to the space station a new microgravity coffee machine named “ISSpresso.”
Advances in the understanding of how fluids behave in low gravity is key to spacecraft operations. A long-awaited spin-off is an excellent cup of coffee in space.
“Our aerospace engineers have designed a coffeemaker that can function in microgravity conditions,” says David Avino of the Italian engineering firm Argotec. “Working together with the coffee company Lavazza and the Italian Space Agency, we have brought authentic Italian espresso onto the International Space Station.”
No one wants to drink Italian espresso from a plastic bag, however. What astronauts need is a “zero-G coffee cup.”
Fortunately, six of these wonders have been delivered to the space station as well.
Fluid physicist Mark Weislogel of Portland State University and IRPI LLC, who helped invent the cups, explains why they are necessary:
"If you tried to use a regular coffee mug, you might not get the coffee to your face," says Weislogel. "It would be trapped at the bottom of the mug.”
In low-gravity environments like the space station, fluids tend to get ‘sticky.’ Surface tension and capillary effects, which are overwhelmed by gravity on Earth, rule the day in space. As a result, coffee tends to cling to the walls of the cup.
“You could dip your tongue in the cup, and lick the hot coffee out. Or you could throw it out of the cup and suck down the scalding blob that forms in the air."
Source: Space Coffee - NASA Science