We use the Churchill-Bernstein equation (valid for $Re Pr > 0.2$): $$Nu_D = \left 0.3 + \frac0.62 Re_D^0.5 Pr^1/3[1 + (0.4/Pr)^2/3]^1/4 \left[ 1 + \left( \fracRe_D282,000 \right)^5/8 \right]^4/5 \right$$
Clearly stating conditions like "steady-state operation" or "constant properties." We use the Churchill-Bernstein equation (valid for $Re
Since the Reynolds number is less than 5 × 10^5, the flow is laminar. Using the correlation for laminar flow over a flat plate, we can calculate the Nusselt number: we can calculate the Nusselt number: