Solution Manual Heat And Mass Transfer Cengel 5th Edition Chapter 7 -

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:

Nu = 0.026 × Re^0.8 × Pr^0.33 = 0.026 × (50,000)^0.8 × 2.58^0.33 = 421.1 Since the Reynolds number is less than 5

Re = ρUD/μ = (1000 kg/m^3 × 10 m/s × 0.1 m) / (2 × 10^(-5) kg/m·s) = 50,000 we can calculate the Nusselt number:

Re = ρUL/μ = (1000 kg/m^3 × 5 m/s × 1 m) / (1.5 × 10^(-5) kg/m·s) = 333,333 Since the Reynolds number is less than 5

The heat transfer coefficient can be calculated as:

Since the Reynolds number is greater than 10^4, the flow is turbulent. Using the correlation for turbulent flow over a cylinder, we can calculate the Nusselt number: