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A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K, is suddenly quenched in a large, constant-temperature oil bath at 350 K. The cylinder properties are k = 1.7 W/m · K, c = 1600 J/kg · K, and ρ = 400 kg/m3, while the convection coefficient is 50 W/m2 · K.
(a) Calculate the time required for the surface of the cylinder to reach 500 K.
(b) Compute and plot the surface temperature history for 0 ≤ t ≤ 300 s. If the oil were agitated, providing a convection coefficient of 250 W/m2 · K, how would the temperature history change?
A piston cylinder closed system expands from state 1 to state 2 due to heat addition and then is compressed from state 2 to state 3. If this process (1-2-3) is a cycle, what can be said about Temperature (T) and Pressure (P)?
Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 K, 1 bar, with a volumetric flow rate of 0.25 m3/s, and exits at 325 K, 0.95 bar. The flow area is 0.04 m2. Assuming the ideal gas model with k 5 1.4 for the ..
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On the basis of your intuition, cite an explicit expression for this temperature dependence.
Carefully draw and label the hydraulic grade line - Determine the total system head for the pipe configuration below (Figure 1) when the rate of flow is 20 L/s and the total static head on the pump is 100 m.
two l4 x 4 x 12-in. angles parallel to and on the x-axis are welded to either sides of a 10-in. high by 12-in. wide
Consider a cold aluminium canned drink that is initially at a uniform temperature of 3°C. The can is 12.5 cm high and has a diameter of 6 cm. The combined convection/radiation heat transfer coefficient between the can and the surrounding air at 25°C ..
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