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ES 202 Fluid and Thermal Systems Lecture 3: Pressure Distribution on Submerged Surfaces (12/05/2002). Assignments. Reading: Cengel & Turner Section 10-4 and 10-5 Homework: 10-11, 10-19, 10-37 in Cengel & Turner Definition of specific gravity and gage pressure. Road Map of Lecture 3.

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es 202 fluid and thermal systems lecture 3 pressure distribution on submerged surfaces 12 05 2002

ES 202Fluid and Thermal SystemsLecture 3:Pressure Distribution on Submerged Surfaces(12/05/2002)

assignments
Assignments
  • Reading:
    • Cengel & Turner Section 10-4 and 10-5
  • Homework:
    • 10-11, 10-19, 10-37 in Cengel & Turner
    • Definition of specific gravity and gage pressure
road map of lecture 3
Road Map of Lecture 3
  • Announcements
  • Quiz on Lecture 2
  • Examples and exercises
    • Conceptual exercises
      • Pressure distribution at various depths and arbitrary shapes
      • Pressure distribution in multiple layers of different fluids
    • Application of manometer
    • Force and moment on vertically submerged surface
      • Concept of resultant force and center of pressure
announcements
Announcements
  • First homework set due by 5 pm next Monday at my office
  • Problem 10-37 is moved to Lecture 4 (next Monday)
  • Comments on write-up for Lab #1
  • Review body force and surface force in ES 201

For Section 06 only:

  • Location of Lab 1 at B105, not the lecture classroom
quiz on lecture 2
Forces acted on a system can generally be classified as:

body force

surface force

Surface force can further be classified as:

shear force

normal force

All about pressure:

Pressure is a vector/scalar.

Pressure is a body/surface force.

Pressure acts in the shear/normal direction.

Pressure is a compressive/expansive force.

Quiz on Lecture 2
quiz on lecture 2 cont d
Pressure is the same/different in different directions at any single point in a fluid.

Pressure variation in a static fluid:

Variation in horizontal direction

P = constant

Variation in vertical direction

d P / d y = - r g

Give a physical meaning/interpretation to the above equation

It is a balance between surface force and body force in a static fluid.

Quiz on Lecture 2 (Cont’d)
conceptual exercises
Conceptual Exercises
  • Pressure at various depths and arbitrary shape
    • Compare the pressure at various locations as indicated
    • What does the linear plot represent in the figure?
    • Does the figure show all the pressure forces present in the system?
    • If necessary, what modification will you make to include all the pressure forces in the system?
  • Pressure in multiple layers of different fluids
    • Draw the gage pressure distribution as a function of fluid depth
    • Discussion of pressure at the interface between fluids
manometer
Manometer
  • Definition: Device used to measure small to moderate pressure difference based on the difference in height of fluid columns
  • Manometer problem
    • What are the pressure values at the selected locations?
    • “Swim” through the fluid as you track down the pressure distribution
slide9

Vertically Submerged Surface

  • Fish tank problem
    • Estimate the total weight of water contained (intuition)
    • What is the pressure at the bottom of the tank?
    • Sketch the pressure distribution on the side wall?
    • Find the total force on the side wall
    • Find the total moment on the side wall about Point A
    • Find the center of pressure (take a first guess at its approximate location)