Ultrasonic Innovation Reduced Cold Brew Time from 24 Hours to 3 Minutes with Sound Waves

By: | May 13th, 2024

Image by UNSW

For fans of cold brew coffee, the wait for that smooth, refreshing cup just got significantly shorter. Traditionally, cold brew steeps for a full 24 hours, a patience test for even the most dedicated caffeine enthusiast. But thanks to a new technique using sound waves, that wait time has been slashed to a mere 3 minutes.

The Science Behind Ultrasonic Cold Brew

Researchers at the University of New South Wales in Sydney, Australia, have tackled the task of expediting the cold brewing procedure. They have developed a method that utilizes ultrasonic waves to rapidly extract flavor from coffee grounds. The innovation, dubbed the “Ultrasonic Brew,” involved integrating their patented sound transmission system onto an existing Breville espresso machine model.

Their system comprises a bolt-clamped transducer linked to the brewing basket through a metallic horn, effectively converting a conventional espresso filter basket into a potent ultrasonic reactor. This reactor operates by emitting sound waves at a frequency of 38.8 kHz through various points along its walls, thereby creating multiple zones conducive to acoustic cavitation within the reactor.

Sound Waves Reshape Cold Brew’s Timeframe

This innovation offers exciting possibilities for both coffee shops and home brewers. Coffee shops can free up valuable refrigerator space and meet customer demand for cold brew without the lengthy preparation time. Home brewers can enjoy a quick and convenient way to create their favorite cold brew whenever the craving strikes.

It’s important to note that this technology is still in its early stages. The current setup uses expensive ultrasonic equipment, and the long-term impact on taste and quality needs further investigation. However, the potential for this sound wave method is undeniable. It could revolutionize the way we enjoy cold brew coffee, making it a more accessible and convenient option for everyone.

Nidhi Goyal

Nidhi is a gold medalist Post Graduate in Atmospheric and Oceanic Sciences.

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