Unknown macro: {latex}
$$
\huge[
{\mathop
Unknown macro: {rm Re}
\nolimits} = {{4Q} \over {\pi D\nu }}
]
$$
Unknown macro: {latex}
$$
{\rm{f}} = 0.25} \over {\left[ {\log \left( {{\varepsilon \over {3.7D + {{5.74} \over {{\mathop
Unknown macro: {rm Re}
\nolimits} ^
Unknown macro: {0.9}
}}} \right)} \right]^2 }}
$$
Unknown macro: {latex}
$$
h_{\rm{f}} = {\rm{f}}{8 \over {g\pi ^2 }}{{LQ^2 } \over {D^5 }}
$$