Entropy generation optimization and activation energy in nonlinear mixed convection flow of a tangent hyperbolic nanofluidM. Ijaz Khan, Tufail A. Khan, Sumaira Qayyum, T. Hayat, Muhammad Imran Khan and A. AlsaediEur. Phys. J. Plus, 133 8 (2018) 329DOI: https://doi.org/10.1140/epjp/i2018-12093-y