This bimodal distribution dictates how water flows through the coffee bed. Fines provide rapid extraction due to their high surface area, but they can also clog the gaps between larger particles, slowing down water movement. Porosity and Diffusion Pathways
The final physical barrier in filter coffee is the paper or cloth filter itself. A paper filter functions as a complex, disordered mesh of cellulose fibers.
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Water always follows the path of least resistance. If the coffee bed is unevenly distributed, or if bubbles are trapped inside, water will carve out high-velocity pathways called channels. the physics of filter coffee epub updated
Gagné breaks down the brewing process into distinct, quantifiable physical phenomena, supported by two years of research and data from thousands of brews. Here is a look at the core subjects covered:
When hot water hits a cold brewer and room-temperature coffee grounds, an immediate transfer of heat occurs. The system quickly reaches a thermal equilibrium that is lower than the starting water temperature.
Filter coffee is a "percolation" method, meaning water flows through a porous bed of coffee under the force of gravity. This introduces the concept of . This bimodal distribution dictates how water flows through
Several physical parameters play a crucial role in determining the quality of filter coffee:
The goal is not to find the "best" recipe, but to allow you to explore brewing possibilities more efficiently. Gagné concludes with his personal V60 method, a starting point for anyone wanting to apply his theories to their daily cup.
, has become the "updated" Bible for enthusiasts looking to understand the forces at play inside their drippers. This post explores the core physical principles—extraction, fluid dynamics, and thermodynamics—that turn a handful of roasted beans into a complex beverage. 1. The Geometry of Extraction A paper filter functions as a complex, disordered
$$Q = \frack \cdot A \cdot \Delta P\mu \cdot L$$
The Physics of Filter Coffee: A Deep Dive In the world of specialty coffee, the boundary between barista and scientist has blurred. Jonathan Gagné’s seminal work, The Physics of Filter Coffee