Engineers Use Ultrasonic Reactor to Make Cold Brew Coffee in Under 3 Minutes

Researchers at the University of New South Wales in Sydney have developed an ultrasonic reactor to make velvety cold brew coffee in under 3 minutes without sacrificing its distinctive smooth flavor. The process involves steeping the grounds in cold water for 12-24 hours to extract oils, aromas, and flavors. The ultrasonic reactor uses sound waves to generate cavitation bubbles that fracture the coffee grounds, accelerating extraction. This results in a supercharged cold brew process that reduces the brew time from a day to around 180 seconds. Sensory tests validated that the 1-3 minute brews matched the taste of a 24-hour cold brew, including the signature dark chocolate aroma. The sonication time between one and three minutes is ideal for creating a coffee comparable to 24-hour cold brew coffee, depending on customer interest. The ultrasonic reactor could be a game-changer for the beverage industry, allowing companies to brew cold coffee on-demand without expensive equipment or refrigeration. It can also be used to produce teas and other steeped drinks.

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