Flow trajectory analysis and velocity coefficients for fluid dynamics in tubes and holesZokhidjon Abdulkhaev, Mamadali Madraximov, Shairakhon Abdujalilova, Saxiba Mirzababayeva, Bakhromjon Otakulov, Abdusalom Sattorov and Zuhriddin UmirzakovE3S Web of Conf., 452 (2023) 02010DOI: https://doi.org/10.1051/e3sconf/202345202010