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ENG103 S08 MIDTERM PROB 2 KEY

ENG103 S08 MIDTERM PROB 2 KEY - (REMINDER FOR FULL CREDIT...

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Unformatted text preview: (REMINDER: FOR FULL CREDIT, SHOW ALGEBRAIC DERNATION FIRST, THEN PLUG IN NUMBERS) 2. Air flows steadily through a section of circular pipe with diameter D. Flow conditions are provided in the sketch below. Assume ideal gas behavior (Rm-r = 287 J/kg/K). Clearly justify each assum tion made in su ort of our anal sis. P2 = 127 kPa P1 = 690kPa T2 = 252K T1 = 300K V2=320 m/s a. Pick and clearly draw on the sketch above a control volume that will allow the calculation of the frictional force, Rx, exerted by the pipe wall on the fluid b. Calculate the velocity of the air at 1, V1 in m/s. Mas/S Wok-M - (Slaw? b“ Fig”) BVIAZPL/lA —) VI: ELM; 17' P; " I27 : 1 2 L V - Pa L' 2 —— (532 (510 fl RH F2. RT; " ’5‘ TL 2 (670)51 5 c. Determine the frictional force, Rx , exerted by the pipe wall on the air flowing through pipe. 9L, (flow) 4"]; fl\7(\7’;)£; 23w I O L A‘;KDL Mzez‘/z,v4' L—L—VLQ ‘2? VT; 4 ...
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