Orifice Meter - Orifice Meter ρ1V1 A1 = ρ 2V2 A2 v2 v2 1 dP 1 = 2 e f ∫ρ 2 2 P2 1 V2 = C d 1(1 − β 4 2 V2 = C d P1 dP 2 P2 ρ 1 2 P 1 2

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Unformatted text preview: Orifice Meter ρ1V1 A1 = ρ 2V2 A2 v2 v2 1 dP + 1 = 2 + e f ∫ρ 2 2 P2 1 V2 = C d 1 (1 − β 4 ) 2 V2 = C d P1 dP 2 ∫ P2 ρ 1 2 P 1 2( P1 − P2 ) ρ (1 − β 4 ) d D Momentum Balance mV1 − mV3 + P1 A0 + P2 ( A1 − A0 ) − P3 A1 = 0 β≡ ρV 2 2 4 (1 − β )(1 − β 2 ) Kf = 2 Cd Calibrated For Air , Find Error With Helium P1 − P3 = K f Q = A0V2 = A0 C d 1 2( P1 − P2 ) ( P1 − P2 ) 2 =C , C ≡ A0 C d 4 ρ ρ (1 − β ) (1 − β 4 ) C 1 2 ρ Air 1 Q = C Air ( P1 − P2 ) 2 C Air ≡ 2 ρ Air ( P1 − P2 ) C ρ Air 1 1 Q=C =1 ( P1 − P2 ) 2 = C Air ( P1 − P2 ) 2 1 2 2 ρ He ρ He ρ Air ρ He Error = ρ Air 29 = = 2.7 ρ He 4 V2 V1 ...
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This document was uploaded on 09/26/2010.

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