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the allowable endurance load?
Which are the following answers?!
A: 23.758.29 N
B: 38.773.54 N
C: 5.244.00 N
D: 47.516.59 N
E:19.386.77 N
c
is to be insulated to reduce heat losses. The heat transfer coefficient between steam and the
pipe surface is 120 W/m2
-k. The outer surface of the pipe may be assumed to be at 3000
c. It is
desired to use 1 cm thick asbestos (K = 0.1105 W/m – k) and 1 cm glass wool (K = 0.038 W/m
– k) insulation. The atmospheric air is at 300
c and the film coefficient between insulating layer
and air is 10 W/m2
-k. Determine which insulating material is to be used as first layer of
insulation? Why?
A uniaxial steel bar is initially 250mm in length with a square cross-section of 50mm x 50mm. The modulus of elasticity is 200 GPa and a poisson's ratio is 0.32 Determine the change in dimensions of the bar when carrying tensile load of 600kn.
ANS: (a) 0.1024, 7.383 kPa (b) 0.7312, 60.3 kPa
Consider the same plate as in the previous question: a square plate of L=1
m side attached to a torsionnal spring of stiffness 10Nm/rad. The mass of the plate is M=1
Kg. Now the air flow is coming from the left at 10m/s. What is the eigenfrequency (Hz) of this oscillator
energy to the air, then humidified by sat steam (at 110oC) with a rate of 0.33kg/min, find
the final air dry and wet bulb temperatures for unit mass rate.
Consider a discrete fluid-solid mechanical system (for instance a wing profile with two degrees of freedom). Solutions of the form V
⃗
e
λt
are looked for, V
⃗
being a two components vector. On the figure below the real and imaginary parts of λ
are plotted as function of the Cauchy number. Give an estimate of the critical value of the Cauchy number at which an instability occurs.
