ME 116

TEST 1: Fluid Properties, Pressure Measurement, Hydrostatic Forces, Rigid Body Motion, Newton's 2nd Law, Bernoulli's Equation

TEST 2:  Velocity and Acceleration Fields, Reynold's Transport Theorem, Finite Control Volume Analysis, Dimensional Analysis and Similitude

TEST 3: Internal Flow, External Flow, Boundary Layer Theory, Drag and Lift

Test 1 Concepts and Materials

Fluid Properties and Pressure Measurement

Important Concepts:

• Units used when measurement units and their meaning (Imperial v. Metric)

• The difference between absolute and gauge pressure

• The concept of fluid shear

• Vapor Pressure, Compressibility, and the Speed of Sound in a fluid.

Fluid shear is the nature by which fluid flows along a wall or boundary. One of the most important rules and concepts in fluid dynamics is the "Zero Boundary Condition." This assumption states that due to friction forces along a wall, average velocity along the wall is ZERO. As distance from the wall increases, velocity increases.

In a gas of mixed composition, such as normal air, the total pressure can be described as the sum of component vapor pressures.

Example: The absolute pressure in a canister is 10 psi, and it consists of helium and hydrogen gas. The hydrogen gas has a partial pressure of 7 psi. What is the partial pressure of the helium?

Answer: Subtract the known partial pressure from the total pressure to find the unknown. The partial pressure of the helium is 3 psi.

Hydrostatic Forces

Rigid Body Motion