volume flow rate,, $$q_{\text{v}}$$

https://doi.org/10.1351/goldbook.V06642
Volume of a component crossing a surface divided by the time.
Source:
PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 997 (https://doi.org/10.1351/pac199668040957)