**5. Conclusions**

The second grade nanofluid flow by a stretching disk is examined here. The nanofluid flow is characterized with Hall current, Brownian motion and thermophoresis influences. Entropy optimization with nonlinear thermal radiation, Joule heating and heat absorption/generation is also presented. Concluding remarks are mentioned below:


**Author Contributions:** Conceptualization, Z.S. and L.B.M.; methodology, M.W.A.; software, Z.S.; validation, R.N. and Z.S.Y.; formal analysis, L.B.M.; investigation, Z.S.; resources, L.B.M.; data curation, M.W.A.; writing—original draft preparation, M.W.A and L.B.M.; writing—review and editing, Z.S. and R.N.; visualization, L.B.M.; supervision, Z.S. and R.N.; project administration, L.B.M.; funding acquisition, L.B.M. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Acknowledgments:** This research is supported by Postdoctoral Fellowship from King Mongkut's University of Technology Thonburi (KMUTT), Thailand.

**Conflicts of Interest:** The authors declare no conflict of interest.
