[Water Inflow] │ │ │ ▼ ▼ ▼ █ █ ░░░ █ █ <-- Water bypasses dense zones (█) █ █ ░░░ █ █ and rushes through the channel (░) │ ║ │ ▼ ▼ ▼ <-- Leads to localized over-extraction
Different chemical compounds in coffee dissolve at different rates depending on thermal energy:
Paper filters trap fine particles (fines) and oils, producing a cleaner cup; metal filters allow more oils and microparticles, increasing body. Filter pore size controls particle and colloid retention, affecting clarity, mouthfeel, and flavor perception. The Physics Of Filter Coffee Pdf
The physics of coffee brewing can be broken down into several key stages:
is the diffusion flux (the amount of solute moving through a unit area per unit time). [Water Inflow] │ │ │ ▼ ▼ ▼
Dissolve rapidly even at lower temperatures.
Where:
: Viscosity of water (which changes drastically with temperature) : Depth of the coffee bed Friction and Resistance