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.
Qu 5 Determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron carbon alloy that initially contains 0.10 wt% C. The surface concentration is to be maintained at 0.90 wt% C, and the treatment is to be conducted at 1100°C. Use the data for the diffusion of
carbon into y-iron: Do = 2.3 x10-5 m2/s and Qd = 148,000 J/mol. Express your answer in hours to three significant figures.
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In figure A, the homogeneous rod of constant cross section is attached to unyielding supports. In figure B, a homogeneous bar with a cross-sectional area of 600 mm2 is attached to rigid supports. The bar carries the axial loads P1 = 20 kN and P2 = 60 kN, as shown.1. In figure A, derive the expression that calculates the reaction R1 in terms of P, and the given dimensions.2. In figure B, calculate the reaction (kN) at A.3. In figure B, calculate the maximum axial stress (MPa) in the rod.
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