CBE 30355 - Lecture Notes - Sept. 4, 2025

Announcements

Class notes

• Hydrostatics
• Lagrangian and Eulerian Descriptions

Goals:

• Calculate pressure distributions in fluids at rest.
• Distinguish Eulerian and Lagrangian descriptions of fluid motion.

Reading

• The class notes.
• BS&L chapter 1

Additional Readings:

I've written a couple of Matlab examples of how you can easily do linear regression on viscosity data (in the file ethglycolvisc.m) and integrate a system of ODE's (in the file rabbitsandfoxes.m). You may find these examples useful for the homework next week...

Demonstration:

In class today we demonstrated how hydraulics work, and how you can use a column of water and a little math to make a weighing scale. You should get to know some key numbers: 1 atm = 33.9 ft of water = 10.3 meters of water, 1psig = 2.3 ft of water, etc. These numbers are useful for doing back-of-the-envelope type calculations in designing piping networks. We'll look at such networks near the end of the term.