Air at a pressure of 1 atm and a temperature of 250 °C is in parallel flow over a top surface of a flat plate that is maintained at a uniform temperature of 20 °C. The plate has a length of 0.35 m (in the flow direction) and a width of 0.2 m. The Reynolds number based on the plate length, ReL is 9x10“. (a) Find the rate of heat transfer to the plate. (b) If the free stream velocity of air is increased 5 times and pressure increased 4 times, what will be the rate of heat transfer? For air at 1 atm: assume k= 0.0299 W/m.k, Pr 0.70.

Air at a pressure of 1 atm and a temperature of 250 °C is in parallel flow over a top surface of a flat plate that is maintained at a uniform temperature of 20 °C. The plate has a length of 0.35 m (in the flow direction) and a width of 0.2 m. The Reynolds number based on the plate length, ReL is 9x10“. (a) Find the rate of heat transfer to the plate. (b) If the free stream velocity of air is increased 5 times and pressure increased 4 times, what will be the rate of heat transfer? For air at 1 atm: assume k= 0.0299 W/m.k, Pr 0.70.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Air at a pressure of 1 atm and a temperature of 250 °C is in parallel flow over a top surface
of a flat plate that is maintained at a uniform temperature of 20 °C. The plate has a length of
0.35 m (in the flow direction) and a width of 0.2 m. The Reynolds number based on the
plate length, ReL is 9x10“.
(a) Find the rate of heat transfer to the plate.
(b) If the free stream velocity of air is increased 5 times and pressure increased 4 times,
what will be the rate of heat transfer?
For air at 1 atm: assume k=0.0299 W/m.k, Pr =0.70.
Draw sketch and show all calculations.

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