Physics of a Good Coffee - PowerPoint PPT Presentation
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Physics of a Good Coffee
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... opening of the cappillars Moka explosion. ~ 10-12 ~ 10-13 ~ 10-14 M=150 g, V=200 cm3 Tmax ~ 300 0C Pmax ~ 103atm E ~ PV ~ 40 KJ v=200 m/s PV=m ... – PowerPoint PPT presentation
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Title: Physics of a Good Coffee
1
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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Italian Moca
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Filtration the Darcy Law
?
?P Q ? L/(S? ?)
Q ?S?P?/ (? L)
Q m/t200 g/min
PPatm
?( C) 10 -3 Pa s
S 10 cm2
L 1 cm
? 10-12
P(T)Patm?P
?P?4104 Pa ? T 110 C
4
The limitation of the Darcy Law at small
pressures opening of the cappillars
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Moka explosion.
PVm/µRT
M150 g, V200 cm3 Tmax 300 0C?Pmax 103atm E
PV 40 KJ ? v200 m/s
? 10-12
? 10-13 10-14
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Espresso machine
