自然对流 Rayleigh 状态

由温差、长度和物性可视化 Grashof/Rayleigh 数、自然对流状态和 Nusselt 估计。

visual calculator传热

先看流动形态，再相信数字。

该工具把 CFD 设置转换为工况、尺度和主导效应提示。调节下方计算器，观察动态图与计算结果如何一起变化。

输入尺度

模型

判断

RayleighGrashofnatural convectionheat transfer

公式

KaTeX rendered

\begin{aligned}\text{Gr = g beta DeltaT L\^{}3 / nu\^{}2}\\[0.35em]\text{Ra = Gr Pr}\end{aligned}

ASCII source

Gr = g beta DeltaT L^3 / nu^2, Ra = Gr Pr

Delta T (K)vertical length L (m)beta (1/K)nu (m^2/s)alpha (m^2/s)k (W/m/K)

Rayleigh Ra

2.873e+8

Grashof Gr

3.950e+8

Prandtl Pr

0.7273

Churchill-Chu Nu

84.1533

h (W/m^2/K)

4.3760

regime

laminar natural convection

L^3 sensitivity

0.1250

buoyancy term

0.8090

Rayleigh thresholds depend on geometry and boundary conditions. Use this as a setup triage before choosing natural-convection correlations or CFD turbulence models.

Rayleigh Grashof natural convection heat transfer