如何计算Reynolds Number
learn.whatIsHeading
Reynolds number predicts flow regime: laminar (smooth, orderly) or turbulent (chaotic, mixing). It's dimensionless and crucial for fluid mechanics analysis.
公式
The calculator applies Re = (ρ × v × L) / η
- Re
- (ρ × v × L) / η — (ρ × v × L) / η
- L
- L value — Variable used in the calculation
分步指南
- 1Enter fluid density, velocity, characteristic length, and dynamic viscosity
- 2The calculator applies Re = (ρ × v × L) / η
- 3Results classify flow and predict behavior
例题解析
输入
ρ = 1000 kg/m³, v = 0.1 m/s, L = 0.01 m (water in small pipe), η = 0.001 Pa·s
结果
Re = 1000 (laminar)
Smooth, predictable flow
常见错误注意事项
- ✕Confusing characteristic length (diameter for pipes, chord for airfoils)
- ✕Using kinematic instead of dynamic viscosity
常见问题
What Reynolds numbers indicate turbulence?
Re < 2300 is laminar, 2300-4000 is transitional, Re > 4000 is turbulent in pipes.
Does Reynolds number apply to all fluids?
Yes, it's dimensionless; the same Re value predicts similar flow behavior regardless of fluid type.
准备好计算了吗？尝试免费的 Reynolds Number 计算器
自己尝试一下 →