Unknown macro: {latex}
[
h_{\rm{f}} = \frac{{32\mu LV}}\rho gD^2 }} = \frac{{128\mu LQ{{\rho g\pi D^4 }}
]
Unknown macro: {latex}
$$
h_{\text{f}} = \frac{{32\mu LV}}
\rho gD^2 }} = \frac{{128\mu LQ
{{\rho g\pi D^4 }}
$$
Unknown macro: {latex}
\huge[
h_{\text{f}} = \frac{{32\mu LV}}
\rho gD^2 }} = \frac{{128\mu LQ
{{\rho g\pi D^4 }}
]