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P 3.04 – Turbulence


In the Coffee Brewing Handbook, Ted Lingle comments: ‘For uniform wetting and extraction of the coffee flavouring material to occur, the brewing water must lift and separate each coffee particle.’ However, he also states, ‘Feeding water to the ground coffee must be done uniformly and gently to ensure that the entire area of the coffee bed receives equal treatment.’ In mechanical applications, to ensure a gentle turbulence, it is our advice that the sprayhead should have as many outlets as possible. This will diffuse the turbulence from each incoming steam from each outlet as much as possible. (We will explore the subject of sprayheads in greater detail in Lesson 4.02)

To investigate the behaviour of the grinds as they come into contact with flows,