Flow velocity measurements using piezoelectric bimorph beam in external fluid flow Aidin Ghaffari, Afshin Moaddab Shabestari and Behnam Heydari Eur. Phys. J. Plus, 137 4 (2022) 487 Published online: 20 April 2022 DOI: 10.1140/epjp/s13360-022-02670-2