The equation of the modulator's passing cross-section area in the pulsation device with the vibrating rotorKyrylo Samoichuk, Vitalii Koshulko, Nataliia Sova and Dmytro TymchakE3S Web of Conf., 508 (2024) 04001DOI: https://doi.org/10.1051/e3sconf/202450804001