Fluid Mechanics:
The speed of shallow water waves in the ocean (e.g., seismic sea
waves or...
Fluid Mechanics:
The speed of shallow water waves in the ocean (e.g., seismic sea
waves or tsunamis) depends only on the still water depth
and the acceleration due to gravity. Derive an expression for wave
speed.
Consider a shallow-water wave of length 1.5km propagating in an
ocean that is 62.5m deep.
a) Calculate the wave’s speed C and period T. (3P)
b) Now suppose that this wave propagates into a region in which
there is a current of strength U that opposes the wave propagation.
Explain how this modifies the dispersion relation and the wave
speed. (2P)
c) Assuming that the wave’s frequency ω remains constant, create
a plot of the wavelength λ as a function...
FLUID MECHANICS
The viscosity of water at 200C (680F) is
1.008 cp (centipoises). (A) Compute the absolute viscosity in
lb-sec/ft2 . (B) If the specific gravity at
200C is 0.998, compute the kinematic viscosity in
ft2/sec.
Use:
1 poise = 1 dyne-sec/cm2
1 lb = 444,800 dynes
1 ft = 30.48 cm
(Please provide a brief step explanation since a solution
has been already provided, but it isn't clear how they arrived at
the final solution. Thank you!)
Fluid Mechanics: A water tank is a cylinder 4 m in height and 2
meters in diameter. The tank is full at time
to. The tank sits on a platform 12 m tall. A
water tap is located at the bottom center of the tank. The tap,
when actuated, opens to a pipe 5 cm in radius.
a. Write down Bernoulli’s
equation. Identify the Pressure, Kinetic and Potential Energy
terms. Show that each has the units of an energy density...
Analysis of waves in shallow water (depth much less than
wavelength) yields te following wave equation:
where h is the water depth and gthe gravitational acceleration.
Give an expression for the wave speed.
1) Write an algebraic expression for the particle speed (cps) at
the sea surface for deep-water waves in terms of period T and wave
amplitude a.
2) Consider a wave with a wavelength L = 500 m and amplitude a =
2 m. Compute the ratio of the phase speed c divided by the particle
speed (cps) using your expression from part b?
Fluid Mechanics Pipe Problem
Type 2 EXAMPLE. Water at 20°C (r=1000 kg/m3 , µ= 0.001 Ns/m2 )
is flowing through 100 m 3/8" steel Sch 80 pipe. Inlet pressure is
11 kPa and outlet pressure is 10 kPa. Z1 = 10 m and Z2 = 2 m.
Find Q.