🎓 Lesson 4
D3
Boundary Layers & Similarity Parameters
A boundary layer is the thin layer of fluid near a surface where flow slows down due to friction, and similarity parameters are numbers (like Reynolds number) that help engineers compare different fluid flows without testing each one individually.
🎯 Learning Objectives
- ✓ Calculate Reynolds and Prandtl numbers for airflow in underground mine ventilation ducts
- ✓ Analyze whether a given convection scenario is laminar or turbulent using boundary layer criteria
- ✓ Apply the Dittus–Boelter correlation to estimate convective heat transfer coefficients in ore processing equipment
- ✓ Explain how boundary layer thickness varies with surface roughness and flow velocity in real mining infrastructure
- ✓ Design minimum duct diameters to maintain turbulent flow (Re > 4000) for effective heat removal in hoist-room cooling systems