Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470917855
Author: Bergman, Theodore L./
Publisher: John Wiley & Sons Inc
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Textbook Question
Chapter 7, Problem 7.43P
The cover plate of a flat-plate solar collector is at 15°C, while ambient air at 10°C is in parallel flow over the plate, with
- What is the rate of convective heat loss from the plate?
- If the plate is installed 2 m from the leading edge of a roof and flush with the roof surface, what is the rate of convective heat loss?
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Air with free stream temperature of 10 C is flowing over a flat plate
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The plate is maintained at 90 C. Find the velocity of air required to have
a rate of heat dissipation as 3.75 kW. Use the correlations:
Nu =0.664Res Pro3 for laminar flow
Nu, = (0.037R *-871)Pr for turbulent flow
Take the properties p = 1.0877 kg/m u=2.029x10 m/s, k=0.028
W/mK, C,-1.007KJ/kg.K and Pr=0.703
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Consider two cases involving parallel flow of dry air at V = 1.5 m/s, T=45°C, and atmospheric pressure over an isothermal plate at
T = 20°C. In the first case, Rex, = 5 x 105, while in the second case the flow is tripped to a turbulent state at x = 0 m. At what x
-location, in m, are the thermal boundary layer thicknesses of the two cases equal? What are the local heat fluxes, in W/m², at this
location for the two cases?
x =
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Air at 20 ◦ C flows inside a pipe 18-mm-ID having a uniform heat flux of 150 W/m 2 on the surface, the average flow velocity at entry being 1.0 m/s. The air pressure is 2 bar. Determine the value of convection coefficient. If the pipe is 2.5 m long, determine the air exit temperature and the wall temperature at the exit. Assume fully developed hydrodynamic boundary layer.
Chapter 7 Solutions
Fundamentals of Heat and Mass Transfer
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