Download (right-click, save target as ...) this page as a Jupyterlab notebook from: ES-20

CE 3305 Engineering Fluid Mechanics
Summer 2022 Exercise Set 20

LAST NAME, FIRST NAME

R00000000

Purpose :

Application of viscous flow principles (drag and lift)

Assessment Criteria :

Completion, plausible solutions, use JupyterLab as a calculator.

Problem 1.

A flat plate 1.5 m long and 1.0 m wide is towed in water at 20$^oC$ in the direction of its length and at a speed of 15 cm/s. Determine the resistance of the plate and the boundary layer thickness at its aft end.

In [1]:
# sketch here
In [2]:
# list known quantities
In [3]:
# list unknown quantities
In [4]:
# governing principles
In [5]:
# solution (step-by-step)
In [6]:
# discussion

Problem 2.

An airplane wing of 2m chord length (leading edge to trailing edge distance) and 11 m span flies at 200 km/hr in air at 30$^oC$. Assume the resistance of the wing surfaces is like that of a flat plate.

  1. What is the friction drag on the wing?
  2. What power will be required to overcome this friction?
  3. How much of the chord is laminar?
  4. What will be the change in drag if a turbulent boundary layer is tripped at the leading edge?
In [7]:
# sketch here
In [8]:
# list known quantities
In [9]:
# list unknown quantities
In [10]:
# governing principles
In [11]:
# solution (step-by-step)
In [12]:
# discussion

Problem 3.

Figure 1 is a schematic of wind blowing on a 55-gallon storage drum.

Figure 1: Schematic of open channel

Estimate the wind speed needed to tip the drum over. The mass of the drum is 54 lbm, the diameter is 24.0 inches, and the height is 36.0 inches.

In [13]:
# sketch here
In [14]:
# list known quantities
In [15]:
# list unknown quantities
In [16]:
# governing principles
In [17]:
# solution (step-by-step)
In [18]:
# discussion