Transport Phenomena

Use this for “Oil of viscosity 0.3 Pa·s fills a 1 mm gap under a 0.5 m² plate moving at 2 m/s. Find the shear stress and the force.”

Use this for “An oil (ρ = 900 kg/m³, μ = 0.05 Pa·s) runs down a vertical wall in a film 0.8 mm thick. How fast does it flow on average?”

Use this for “A steam line of outer radius 0.03 m at 120 °C gets 0.02 m of insulation (k = 0.05 W/(m·K)) in 25 °C air with h = 8 W/(m²·K). Find the heat lost per metre.”

Use this for “A 2 mm-radius rod with k = 20 W/(m·K) makes 1 × 10⁸ W/m³ of heat, and its surface is at 90 °C. How hot is its centre?”

Use this for “Water at 30 °C (4.25 kPa) evaporates up a 15 cm tube into dry air at 101.3 kPa, D = 2.7 × 10⁻⁵ m²/s. What is the flux?”

Use this for “Sugar diffuses in still water with D = 5 × 10⁻¹⁰ m²/s. About how long to spread 2 mm?”

Use this for “Water vapour diffuses into air flowing at Re = 20,000 in a wet smooth tube, Sc = 0.61. Estimate Sh from the friction factor.”

Use this for “Engine oil at 80 °C has cₚ = 2131 J/(kg·K), μ = 0.032 Pa·s and k = 0.138 W/(m·K). Find Pr and say what it compares.”