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\large
$$
Q = C_v A_2 \sqrt {{
Unknown macro: {2(p_1 - p_2 )}
\over {\rho \left[ {1 - \left( {{
Unknown macro: {d_2 } \mathord{\left/
{\vphantom {
{\vphantom {
Unknown macro: {d_1 } }} \right.
\kern-\nulldelimiterspace}
\kern-\nulldelimiterspace}
}} \right)^4 } \right]}}}
$$