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

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

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### ES 202Fluid and Thermal SystemsLecture 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
- 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

- 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

- Fundamentals of control volume analysis

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

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 4Cargo Problem as Introduction

- Work on the problem
- Give me a physical reason for the cause of the buoyancy force

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

- 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)

- 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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