MECH 213 - 8.28.2007

MECH 213 - 8.28.2007 - MECH 213 PV Diagram for Polytropic...

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MECH 213 – August 28, 2007 PV Diagram for Polytropic process in an Ideal Gas Pressure Units 1 atm = 14.7 psia = 101.3 kPa dp = ρgdz dp/dz = lim Δz 0 [p(z - Δz) – p(z)]/-Δz = lim Δz 0 [(p + ρgΔz) – p]/-Δz dp/dt = -ρg Δp = -ρgΔz (z +↑) MANOMETER Right Side p 2 = p atm p 3 = p 2 + Δp p 3 = p 2 + ρgΔz but p 1 ≡p 3 n = 1 n=k n =0 n = ∞ p Area ρ dz p + dp P 1 2 dz Water lvl
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BAROMETER
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MECH 213 - 8.28.2007 - MECH 213 PV Diagram for Polytropic...

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