Nomenclature and Units
Notation | Quantity | Unit |
---|---|---|
\(A\) |
Area |
\(m^{2}=10^{6} \mathrm{mm}^{2}=10^{4} \mathrm{cm}^{2}\) |
\(\rho\) |
Density |
\(k g / m^{3}=10^{3} g / c m^{3}\) |
\(t\) |
Time |
\(S\) (second) |
\(T\) |
Temperature |
\(C\) (degree Celsius), \(K\) (degree Kelvin) |
\(C_p\) |
Specific heat |
\(J / k g C=J / k g K\) |
\(k\) |
Conductivity |
\(W / m C=W / m K\) |
\(h\) |
Convection heat transfer coefficient |
\(W / m^{2} C=W / m^{2} K\) |
\(q\) |
Rate of heat transfer |
\(W\) |
\(\sigma\) |
Stefan Boltzmann constant |
\(W / m^{2} K^{4}\) |
\(\mathcal{E}\) |
Emmissivity |
Process |
\(h\) \(\left(\mathrm{W} / \mathrm{m}^{2} \cdot \mathrm{K}\right)\) |
Free convection |
|
Gases |
\(2-25\) |
Liquids |
\(50-1000\) |
Forced convection |
|
Gases |
\(25-250\) |
Liquids |
\(100-20,000\) |
Convection with phase change |
|
Boiling or condensation |
\(2500-100,000\) |