A horizontal, opaque surface at a steady-state temperature of 80°C is exposed to an airflow having a free stream temperature of
25°C with a convection heat transfer coefficient of 20 W/m2 ·K. The emissive power of the surface is 628 W/m2 , the irradiation is 1380 W/m2 , and the reflectivity is 0.30.
Determine the absorptivity of the surface.
Determine the net radiation heat transfer rate for this surface. Is this heat transfer to the surface or from the surface?
Determine the com-bined heat transfer rate for the surface. Is this heat transfer to the surface or from the surface?
Determine the absorptivity of the surface.
Determine the net radiation heat transfer rate for this surface. Is this heat transfer to the surface or from the surface?
Determine the com-bined heat transfer rate for the surface. Is this heat transfer to the surface or from the surface?
1 answer:
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Answer with Explanation:
The general equation of simple harmonic motion is
where,
A is the amplitude of motion
is the angular frequency of the motion
is known as initial phase
part 1)
Now by definition of velocity we have
part 2)
Now by definition of acceleration we have
part 3)
The angular frequency is related to Time period 'T' as
where
is the angular frequency of the motion of the particle.
Part 4) The acceleration and velocities are plotted below
since the maximum value that the sin(x) and cos(x) can achieve in their respective domains equals 1 thus the maximum value of acceleration and velocity is and
respectively.
