Analytical investigation of hydromagnetic ferro-nanofluid flowing via rotating convergent/divergent channelsSalim Hamrelaine, Mohamed Kezzar, Mohamed Rafik Sari and Mohamed R. EidEur. Phys. J. Plus, 137 11 (2022) 1291DOI: https://doi.org/10.1140/epjp/s13360-022-03480-2