For fluid flow over a surface, the heat flux to the surface can be computed as

J = -k dT/dy

Where J = heat flux (W/m²), k = thermal conductivity (W/m ∙ K) T = temperature (K), and y = distance normal to the surface (m).

The following measurements are made for air flowing over a flat plate that is 200 cm long and 50 cm wide:

If k = 0.028 J/s ∙ m ∙ K,

(a) Determine the flux at the surface and

(b) The heat transfer in watts. Note that 1 J = 1 W ∙ s.

. T, K 3. 480 270 900 200