Examples 15-1 and 15-2

Examples 15-1 and 15-2 - Example 15.2 0 Steam leaves a...

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Unformatted text preview: 9/29/2010 Example 15.2 0 Steam leaves a pressure cooker operating at 30 psia. The amount of liquid in the cooker decreases by 0.4 gal in 45 minutes after steady operating conditions are established. The cross-sectional area of the exit opening is 0.15 inz. — Determine the mass flow rate of steam and exit velocity. (Answers: 1.19x10‘3 lbm/s, 15.7 ft/s) — What is the total energy of steam per unit mass? (Answer: 1164.3 Btu/lbm) What part of that energyr is flow energy? (Answer: 76.3 Btu/lbm) — At what rate does energy leave the cooker? (Answer: 1.39 Btu/s) 9/29/2010 Solutions for Example 15.2 (,1 {MAM-u: adage idly-m 080:0» fig 5 U Q m? aHm-é); .U.m cage/x << r’fwedSi. o khijeaokfi ti; 8< PE: '13 esan5fi3 E§.U. Paying (1Q 80.9 : 0.059859 . P m ___ v 2 M ,1, fit as" ’USUOF"L_.W 0 0.9009 3%» 3. ”WA 36' Em: ._____,,3.22 31,... :3 Hal x163 LEM/5. 45Mi““oyflqiw . 9/29/2010 10 Summary and Conclusions - In this lecture, we: — defined mass flow rate and volume rate — stated conservation of mass principle - understood the meaning of flow energy WEE; For a steady compressible flow, does the volume flow rate remain constant? - Next Lecture — Energy Balance — Open System What Is steady flow? what is uniform flow? Consider a device with one inlet and one exit. If the volume flow rates at the inlet and exit are same, is the flow through the device steady or unsteady? Why? 9/29/2010 11 ...
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