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Category > Computer Science Posted 12 Sep 2017 My Price 9.00

electrical components

One-hundred electrical components, each dissipating 25 W, are attached to one surface of a square (0.2 m × 0.2 m) copper plate, and all the dissipated power is transferred to water in parallel flow over the opposite surface. A turbulator 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∞ = 2 m/s and T∞ = 17°C, and its thermophysical properties may be approximated as = 0.96 × 10-6 m2 /s, k = 0.620 and Pr = 5.2.

(a) What is the temperature of the copper plate?

(b) If each component has a plate contact surface area of 100 mm2 and the corresponding contact resistance is 2 × 10-4 m2 . K/W,what is the component temperature? Neglect the temperature variation across the thickness of the copper plate.

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Maurice Tutor
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Status NEW Posted 12 Sep 2017 10:09 PM My Price 9.00

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