3. A blacktop road surface 18.3 m. wide receives solar radiation at the rate of 284 W/m² at noon and 189W/m² is lost by forced convection (the remaining is lost by radiation, and you do not need to account for it).A steady wind at 300 K blows across the road.A. Determine the wind velocity that will cause the road surface to be at 308K. Assume that the flow islaminar.B. Once you calculate the wind velocity, comment if this was a reasonable assumption.C. If your answer to part B is "no" - recalculate the velocity assuming turbulent flow

Answered: 3. A blacktop road surface 18.3 m. wide…

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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3. A blacktop road surface 18.3 m. wide receives solar radiation at the rate of 284 W/m² at noon and 189
W/m² is lost by forced convection (the remaining is lost by radiation, and you do not need to account for it).
A steady wind at 300 K blows across the road.
A. Determine the wind velocity that will cause the road surface to be at 308K. Assume that the flow is
laminar.
B. Once you calculate the wind velocity, comment if this was a reasonable assumption.
C. If your answer to part B is "no" - recalculate the velocity assuming turbulent flow

Expert Solution

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Given That:

$Width of blacktop road surface (w) = 18.3 m Solar radiation received at noon (q_{in}) = 284 W / m ² Forced convection heat loss (q_{conv}) = 189 W / m ² Air temperature (T_{air}) = 300 K Surface temperature required (T_{surface}) = 308 K Thermal conductivity of blacktop (k) = 0.024 W / m \cdot K$

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