An isothermal, 100 cm × 100 cm square plate is exposed to air. The air temperature is 25 ◦C, and the surface temperature is 45 ◦C. 1. Assuming pure natural convection, calculate the average heat...

An isothermal, 100 cm × 100 cm square plate is exposed to air. The air temperature is 25 ◦C, and the surface temperature is 45 ◦C.

1. Assuming pure natural convection, calculate the average heat transfer coefficients for three configurations:

(a) vertical;

(b) inclined at 60◦ to the vertical, with heated surface downward;

(c) Horizontal, upward facing.

2. Repeat part 1(a), this time assuming that the ambient air is flowing upward at a velocity of 0.1 m/s