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ES 202 Fluid and Thermal Systems Lecture 5: Buoyancy & ES 201 Review (12/10/2002)

ES 202 Fluid and Thermal Systems Lecture 5: Buoyancy & ES 201 Review (12/10/2002). Assignments. Reading: Cengel & Turner Section 11-1 ES 201 notes Homework: 10-28, 10-32, 5-62E, 5-75 in Cengel & Turner

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ES 202 Fluid and Thermal Systems Lecture 5: Buoyancy & ES 201 Review (12/10/2002)

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  1. ES 202Fluid and Thermal SystemsLecture 5:Buoyancy & ES 201 Review(12/10/2002)

  2. Assignments • Reading: • Cengel & Turner Section 11-1 • ES 201 notes • Homework: • 10-28, 10-32, 5-62E, 5-75 in Cengel & Turner • For Problem 10-28, “10 cm” should be changed to “9.5 cm” in the figure for consistency • Look up steady state devices (nozzle, diffuser, turbine, compressor, heat exchanger)

  3. Road Map of Lecture 5 • Announcements • Buoyancy • Cargo problem as introduction • Archimedes’ principle • Examples • Review of ES 201 concepts • Fundamentals of control volume analysis • common form of conservation equation • steady state device: nozzle, diffuser, turbine,compressor, heatexchanger • function • design assumption • operation assumption

  4. Announcements • Feedback on problem session • Advice on data analysis, interpretation • For Section 5 only: • Lab write-up due tomorrow by 5 pm at my office

  5. Name at least two ways to find the resultant hydrostatic force on a submerged surface. The center of pressure is always above/below the centroid of a submerged surface. Explain your answer. Compare the hydrostatic forces acted on Surface AB in the following configurations: A A A B B B Quiz on Lecture 4

  6. Cargo Problem as Introduction • Work on the problem • Give me a physical reason for the cause of the buoyancy force

  7. Archimede’s Principle The buoyancy force acting on a body immersed in a fluid: • is equal to the weight of the fluid displaced by the body (magnitude); • and it acts upward through the centroid of the displaced volume (direction).

  8. More Example Problems

  9. Conservation and Accounting Principles • Common structure of accounting equation: storage = in – out + production • The above equation can be expressed in • rate form • finite time form • Major difference between the accounting of various extensive properties • means of transport (can be classified as “in” term) • production

  10. Production (Physics) • The simple book-keeping form does not contain any physics. It is true in general, even in balancing your check book. • The “physics” part comes in through the prescription of the production term. • What is the production for the followings: • mass • energy • momentum • entropy

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