example 14-1 - Example 14-1 Air enters a diffuser at a...

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Example 14-1 Air enters a diffuser at a volumetric flow rate of 697 cfm (ft 3 /min), a pressure of 40 psia, and a density of 0.2 lbm/ft 3 . The air exits at 101°F. Using areas on the figure and assuming variable specific heat, find a) the inlet temperature b) the exit velocity c) the exit pressure Solution: a) The specific volume is 3 1 1 3 11 f 5 lbm lbm 0.2 ft v ρ == = t = o 1 temperature(air, 40, 5) 80.2 F TP v = b) From the first law 22 12 hh += + V
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() 3 1 1 2 2 1 2 ft 1min 697 min 60s ft 523 s 1ft 3.2in 144in V A ⎛⎞ ⎜⎟ ⎝⎠ == = ± V 1 Btu enthalpy(air, 80.2) 129 lbm hT = 2 Btu enthalpy(air, 101) 134 lbm = 2 21 2 2 hh =− + 1 2 2 2 2 ft 25037 Btu ft s 2 129 134 523 Btu
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This note was uploaded on 04/06/2009 for the course ENGR 2250 taught by Professor Borca-tasciuc during the Spring '08 term at Rensselaer Polytechnic Institute.

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example 14-1 - Example 14-1 Air enters a diffuser at a...

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