CE 319F: (© Kinnas, 1998-2020)
     Web-outs, Announcements, Homework Assignments & Solutions
     Spring 2020 - Part I (before Test I)

• LABS will be held EVERY week (the starting week will be announced here and in class). Make sure you visit the Lab website and print the corresponding documents BEFORE each lab.
• 1st class: Tuesday, Jan. 21; Reading assignment (from the textbook): pp. 1-11
  • NO Homework due the first week of class!
  • Pictures of applications of fluids
  • See what can happen to a bridge if you do not account for the wind forces!
  • The Greek alphabet
  • A Table of commonly used units in Fluid Mechanics - Tables and Figures (to be provided with your Tests and Final Exam)
    • Q1: An object weighs 1 lbf (on earth). What is its mass (in slugs and in lbm)? (the answer will be given in class)
    • Q2: How much 1 kg or 1 slug weigh (on earth)? (the answer will be given in class)
• 2nd and 3rd classes (January 23 & 28); Reading assignment (from the textbook): pp. 14-18 and pp. 33-48
  • Tables and Figures from the Appendix of the textbook (revised, as it will be provided in the exams)
    • Q3: How are the density, the specific weight, and the specific gravity of mercury on the moon, related to those on the earth? g_moon=1/6 g_earth (the answer will be given in class)
    • Q4: Verify the value for the density of air at p=1atm and 20 deg C, with that given in Table A.3. What will the density at p=2 atm (absolute) and 20 deg C?
  • Applications of viscosity:
    • Velocity and shear stress profiles inside a flowing fluid
    • Viscous flow between two parallel walls (Couette flow)
    • Plate sliding down a ramp as in Ex. 2.2
    • Solution to Problem 2.40 (determine the torque Q for omega=5 rad/sec, D=10 cm, y=h= 2mm) will be presented in class (correct answer: Q=2.45x10^(-4) N.m)>>> Inner surface of rotating disk, as given in Probs 2.40 and 2.41
    • Application of shear thicknening fluid to design of armors for soldiers and football players
  • Homework No.1 - Solutions
• 4th class (January 30); Reading assignment (from the textbook): pp. 48-52
  • An engineer's perspective of surface tension
  • Applications of surface tension: Capillary rise>>> Water droplet>>> Walking on water!? (see examples: Paper clip on water & A bug walking on water!)
  • Homework No.2 - Video showing the apparatus used to measure surface tension, described in Prob. 2.54 in HW#2 (go to the middle of the video)- Solutions
• 5th and 6th classes (February 4 & 6); Reading assignment (from the textbook): pp. 60-75
  • Does pressure depend on direction?
  • Illustation showing Pascal's experiment to prove his law!
  • Example of piezometric pressure
  • Application of hydrostatic law to atmospheric pressure change with altitude (revised on 9/19/18)- Link to U.S. Standard Atmosphere
  • In this picture, where is the pressure higher, at the bottom of the decanter or the bottom of the wine glass? What if the height of the wine in the glass were the same as the height of the wine in the decanter?
  • How does a Bourdon gage work?
  • How does a (pressure) strain gage look like, how is it mounted, and how does it work?
  • Homework No.3 - Solutions
• 7th, 8th, and 9th classes (Febr. 11, 13, and 18); Reading assignment (from the textbook): pp. 75-81
  • Hydrostatic force on a vertical flat gate [drawing used in the proof of: F_gate=p_centroid * A and Delta=y_cp-ybar=Ibar/(ybar*A)]
  • Perspective drawing of gate of Prob. 3.64, the solution of which will be presented in class
  • Check the UT's Hydrostatic Pressure Interactive Java Applet! Can you change the water level and compare your results to those from the applet?
  • How to deal with gate forces when the free-surface is under non-zero gage pressure?
  • Homework No.4 (it includes several old Test I problems) - Solutions
• Test I - February 27, 2020

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