Engineering, 15.04.2020 17:27, naansah5457
One hundred electrical components, each dissipating 25 W, are attached to one surface of a square (0.2 m x 0.2 m) copper plate, and all the dissipated energy is transferred to water in parallel flow over the opposite surface. A protuberance at the leading edge of the plate acts to trip the boundary layer, and the plate itself may be assumed to be isothermal. The water velocity and temperature are u_{\infty } = 2 m/s and T_{\infty } = 17o C, and the water's thermophysical properties may be approximated as \nu = 0.96 x 10-6 m2/s, k = 0.620 W/m\cdotk, and Pr = 5.2.
(a) What is the temperature of the copper plate?
(b) If each component has a plate contact surface area of 1 cm2 and the corresponding contact resistance is 2 x 10-4 m2*K/W, what is the component temperature? Neglect the temperature variation across the thickness of the copper plate
Answers: 2
Engineering, 03.07.2019 14:10, makaylashrout77
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 04.07.2019 18:10, wyattlb97
Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?
Answers: 3
One hundred electrical components, each dissipating 25 W, are attached to one surface of a square (0...
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