Notes on Chapter 7 examples

Nm e k e k 400 c e k 300 c 1558 113 j s

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Unformatted text preview: b m 32174 ft 3 7.4805 gal 1 ft s2 1 gal mg z mu 2 2 Ep mg b zg u 2g b zg 12 10 ft 1 lbf 32.174 lbm ft / s2 LM2FG 32.174 ft IJ b10 ftgOP NH sK Q 834 ft lb f . 12 25.4 2 ft s (c) False Ek 7.7 (a) positive When the pressure decreases, the volumetric flow rate increases, and hence the velocity increases. Ep negative The gas exits at a level below the entrance level. 5m s (b) m b1.5g cm 2 2 1 m3 10 4 cm 2 273 K 10 bars 1 kmol 303 K 1.01325 bars 22.4 m 3 STP bg 16.0 kg CH 4 1 kmol 0.0225 kg s PoutVout PinVin uout Ek Vout Vin nRT nRT 1 2 2 m(uout uin Pin Pout Pin Pout 2 uin ) uout (m/s) A(m2) uin (m/s) A(m2) 5ms 10 bar 9 bar Pin Pout 5.555 m s 0.5(0.0225) kg (5.5552 s 5.0002 )m 2 1N 1W 2 2 s 1 kg m/s 1 N m/s 0.0659 W Ep mg ( zout zin ) 0.0225 kg 9.8066 m -200 m s s 44.1 W 7- 3 1N 1W 2 kg m/s 1 N m/s...
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