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Physics of a Good Coffee

Physics of a Good Coffee. Andrei Varlamov COHERENTIA INFM-CNR, Roma Giuseppe Balestrino Universita’ “Tor Vergata”, Roma. Wroclaw, September,15 2006. Italian Moca. Filtration: the Darcy Law. →. Q = κ S  P ρ / (  L).  P = Q  L/(S  κ ). Q = m/t~200 g/min. P=P atm.

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Physics of a Good Coffee

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  1. Physics of a Good Coffee • Andrei Varlamov COHERENTIA INFM-CNR, Roma • Giuseppe Balestrino Universita’ “Tor Vergata”, Roma Wroclaw, September,15 2006

  2. Italian Moca

  3. Filtration: the Darcy Law → Q = κSPρ/ ( L) P = Q  L/(S κ) Q = m/t~200 g/min P=Patm ( °C) = 10 -3 Pa s S~ 10 cm2 } L~ 1 cm κ~ 10-12 P(T)=Patm+P P4·104 Pa →T* ~ 110 °C

  4. The limitation of the Darcy Law at small pressures: opening of the cappillars

  5. Moka explosion. PV=m/μRT M=150 g, V=200 cm3 Tmax ~ 300 0C→Pmax ~ 103atm E ~ PV ~40 KJ → v=200 m/s κ~ 10-12 κ~ 10-13~ 10-14

  6. Espresso machine

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