) within the cellular matrix of the bean. When water infiltrates these pores, it displaces the gas. The Displacement Problem If you do not allow the CO2cap C cap O sub 2
Plastic brewers have lower thermal conductivity and lower heat capacity than ceramic or glass brewers. Consequently, plastic absorbs less energy from the water, preserving a higher and more consistent extraction temperature within the coffee bed. 4. Chromatographic Separation of Flavors the physics of filter coffee pdf full
When dry paper contacts water, capillary pressure pulls water into the pores. The Washburn equation describes this: ) within the cellular matrix of the bean
A critical, often overlooked physical force is . During the drawdown phase (when the water level falls), the coffee bed is subjected to drag forces. The water moving downward pulls particles with it. Consequently, plastic absorbs less energy from the water,
[ t = \frac2\mu L^2\gamma \cdot r \cdot \cos\theta ] Where ( \gamma ) is surface tension, ( r ) is pore radius, ( \theta ) is contact angle.
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