The Physics Of Filter Coffee Epub Updated Jun 2026
For a decade, baristas believed fines (particles <100µm) always clog filters and cause bitterness.
The updated edition adds three new experiments using particle image velocimetry (PIV) showing how the angle of the coffee bed wall affects local flow velocity. This directly impacts how you should grind for slow drippers like the Hario Switch versus fast drippers like the Origami. the physics of filter coffee epub updated
: Detailed studies on the physics of paper filters, the geometry of different drippers, and the impact of kettle design on agitation and turbulence. Practical Application For a decade, baristas believed fines (particles <100µm)
His personal kitchen eventually became a full-fledged lab, and his blog, , attracted a massive audience of "coffee geeks" eager for data-backed evidence rather than barista lore. The Resulting "Textbook" : Detailed studies on the physics of paper
Pre-heating your carafe is insufficient. You need to disrupt the thermal boundary layer. The updated method (tested by Lance Hedrick, 2025) is a "thermal tap" —at 1:15 and 2:00, briefly increase pour height to 10cm above the bed. The falling water jet creates a vortex that mixes the stratified layers without channeling.
The first sign of trouble was the . A Japanese barista on YouTube had demonstrated that pouring water in a spiral, not a circle, changed the extraction gradient. Aris scoffed. “Hydrodynamic theater,” he muttered. But he ran the simulation anyway. To his horror, the model showed a 12% increase in dissolution efficiency. His entire chapter on isotropic extraction was wrong.