Lecture4_7

Lecture4_7 - • We can write u + pv as something else…....

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9/26/2010 1 AME 331 Introduction to Fluid Mechanics Chapter 4: Basic Equations in Integral Form Prof. Jesse Little University of Arizona 9/27/10 1 Lecture Preview and Assignments Today Finish Chapter 4 Read Chapter 5-1 for next time Homework 4 due today Homework 5 due Friday (10/1) Exam 1 Monday (10/4) Covers Chapters 1-4 2
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9/26/2010 2 First Law of Thermodynamics (4-8) Summarizing the work we left off with last time Let’s plug this in to the 1 st law (rearranged a bit) Now an intelligent trick 3 First Law of Thermodynamics (4-8) Plug this back into the 1 st law The normal stress is pressure in most flows. Substituting our definition of energy gives: 4
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9/26/2010 3 First Law of Thermodynamics (4-8) We finally arrive to the expression we will use
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Unformatted text preview: • We can write u + pv as something else…. . 5 Lecture Example 4-6 • 4.198: Air at STP enters a compressor at 75 m/s and leaves at an absolute pressure and temperature of 200 kPa and 345 K, respectively, and speed V=125 m/s. The flow rate is 1 kg/s. The cooling water circulating around the compressor casing removes 18 kJ/kg of air. Determine the power required by the compressor. 6 9/26/2010 4 Second Law of Thermodynamics (4-9) • Start with our basic system law • Where • Now apply RTT 7 Second Law of Thermodynamics (4-9) • As with momentum, angular momentum and energy, we can write the 1/T term as an integral associated with our CV • Finally 8 9/26/2010 5 Chapter 4 v. Chapter 5 • Integral v. Differential Forms • Rocket Video • Airfoil Video 9...
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This note was uploaded on 08/25/2011 for the course AME 331 taught by Professor Zohar during the Fall '08 term at Arizona.

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Lecture4_7 - • We can write u + pv as something else…....

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