| Input | Value | Units | |-------|-------|-------| | Tip dia (d) | 25 | mm | | Root dia (D) | 38 | mm | | Bore dia (b) | 6 | mm | | Length (L) | 150 | mm | | Velocity (V) | 5 | m/s | | Density fluid (ρf) | 1000 | kg/m³ | | Density material (ρm) | 8000 | kg/m³ | | E | 193 | GPa | | μ | 0.001 | Pa·s |
The ratio was 0.97.
| Pitfall | Consequence | Mitigation | |---------|-------------|-------------| | Ignoring fluid-added mass | Overestimates f_n → false safety | Include ρf·πd²/4 in m_total | | Using tip dia only for St | Underestimates f_w for tapered wells | Use average diameter (d_root + d_tip)/2 | | Assuming incompressible flow | Inaccurate St for gases >0.3 Mach | Use compressible correction | | Neglecting temperature effect | E changes → f_n shifts | Recalculate at operating temp | | Applying to very short wells | Beam theory invalid | Use finite element analysis (FEA) | thermowell wake frequency calculation
where: