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1. Triangular and parabolic straight fins are subjected to the same thermal conditions as the rectangular straight fin of Problem 3.134.
(a) Determine the length of a triangular fin of unit width and base thickness t = 3 mm that will provide the same fin heat rate as the straight rectangular fin. Determine the ratio of the mass of the triangular straight fin to that of the rectangular straight fin.
(b) Repeat part (a) for a parabolic straight fin.
2. Two long copper rods of diameter D = 10 mm are soldered together end to end, with solder having a melt- ing point of 650°C. The rods are in air at 25°C with a convection coefficient of 10 W/m2 · K. What is the minimum power input needed to effect the soldering?
a vapor-compression refrigeration cycle employed in a heat pump uses refrigerant r-134a and provides 15 kw of heating.
Demonstrate suitable accuracy by using a simple hand calculation for the static analysis of the structure. Describe in detail the hand calculations performed to validate the final solution. What is the approximate error between the simplified hand..
air enters an insulated diffuser operating at steady state with a pressure of 105 nm2 and a temperature of 57 degrees
Explain covalent bond? Explain Metallic bond and what important property derives from it in metals?
A pressure drop of 200 kPa is measured over a 400-m length of 8-cm-diameter horizontal cast iron pipe that transports 20-C water. Determine the ?ow rate using (a) the Moody diagram and (b) an alternate equation.
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A piston-cylinder device contains helium gas initially at 150 kPa, 20 degrees C, and 0.4 m^3. The helium is now compressed in a polytropic process (PV^n = constant) to 400 kPa and 140 degrees C. Determine the heat loss or gain during this process.
Consider the heat exchanger of Problem 11.14. After several years of operation, it is observed that the outlet temperature of the cold water reaches only 95°C rather than the desired 120°C for the same flow rates and inlet temperatures of the flui..
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118 an insulated rigid tank whose volume is 0.5 m3 is connected by a valve to a large vessel holding steam at 40 bar
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a large plate of a titanium-aluminum-vanadium alloy ti-6al-4v is at room temperature. estimate the maximum length of an
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