Consider steady heat transfer between two large parallel plates at constant temperatures of T 1 = 290 K and T 2 = 150 K that are L = 2 cm apart. Assuming the surfaces to be black (emissivity ε = 1 ) , determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air, (b) evacuated, (c) filled with fiberglass insulation, and (b) filled with super insulation having an apparent thermal conductivity of 0.00015 W/m⋅K.
Consider steady heat transfer between two large parallel plates at constant temperatures of T 1 = 290 K and T 2 = 150 K that are L = 2 cm apart. Assuming the surfaces to be black (emissivity ε = 1 ) , determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air, (b) evacuated, (c) filled with fiberglass insulation, and (b) filled with super insulation having an apparent thermal conductivity of 0.00015 W/m⋅K.
Consider steady heat transfer between two large parallel plates at constant temperatures of
T
1
=
290
K
and
T
2
=
150
K
that are
L
=
2
cm
apart. Assuming the surfaces to be black (emissivity
ε
=
1
)
,
determine the rate of heat transfer between the plates per unit surface area assuming the gap between the plates is (a) filled with atmospheric air, (b) evacuated, (c) filled with fiberglass insulation, and (b) filled with super insulation having an apparent thermal conductivity of 0.00015 W/m⋅K.
I had a theoretical question about attitude determination. In the attached images, I gave two axis and angles. The coefficient of the axes are the same and the angles are the same. The only difference is the vector basis. Lets say there is a rotation going from n hat to b hat. Then, you introduce a intermediate rotation s hat. So, I want to know if the DCM produced from both axis and angles will be the same or not. Does the vector basis affect the numerical value of the DCM? The DCM formula only cares about the coefficient of the axis and the angle. So, they should be the same right?
3-15. A small fixed tube is shaped in the form of a vertical helix of radius a
and helix angle y, that is, the tube always makes an angle y with the horizontal.
A particle of mass m slides down the tube under the action of gravity. If there is
a coefficient of friction μ between the tube and the particle, what is the steady-state
speed of the particle? Let y
γ
30° and assume that µ < 1/√3.
The plate is moving at 0.6 mm/s when the force applied to the plate is 4mN. If the surface area of the plate in contact with the liquid is 0.5 m^2, deterimine the approximate viscosity of the liquid, assuming that the velocity distribution is linear.
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