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Physics of a Good Coffee Andrey Varlamov SPIN-CNR, Roma Giuseppe Balestrino Universita’ “Tor Vergata”, Roma Cambridge University, 29/09/ 2008.

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Presentation on theme: "Physics of a Good Coffee Andrey Varlamov SPIN-CNR, Roma Giuseppe Balestrino Universita’ “Tor Vergata”, Roma Cambridge University, 29/09/ 2008."— Presentation transcript:

1 Physics of a Good Coffee Andrey Varlamov SPIN-CNR, Roma Giuseppe Balestrino Universita’ “Tor Vergata”, Roma Cambridge University, 29/09/ 2008

2 Italian Moca

3 Filtration: the Darcy Law atm +  P P(T)=P atm +  P }  P = Q  L/(S  κ)  ( °C) = Pa s  P  4· 10 4 Pa → T* ~ 110 °C Q = m/t~200 g/min L~ 1 cm atm P=P atm → Q = κS  Pρ/ (  L) S~ 10 cm 2 κ ~

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

5 Moka explosion. κ ~ κ ~ ~ M=150 g, V=200 cm 3 T max ~ C→P max ~ 10 3 atm E ~ PV ~ 40 KJ → v=200 m/s PV=m/μRT

6 Espresso machine


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