es 202 fluid and thermal systems lecture 5 buoyancy es 201 review 12 10 2002
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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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assignments
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)
road map of lecture 5
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
announcements
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
quiz on lecture 4
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
cargo problem as introduction
Cargo Problem as Introduction
  • Work on the problem
  • Give me a physical reason for the cause of the buoyancy force
archimede s principle
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).
conservation and accounting principles
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
production physics
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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