**8. Conclusions**

In this article we studied the flow of two vertical conical carbon nanotubes (SWCNT and MWCNT) under the action of aqueous nanofluids, accompanied by the movement of swirling microorganisms and the influence of solute stratification in porous media. The investigation is carried out in the presence of chemical reactions, heat generation/absorption, and Joule heating. The noticeable features of the modeled problem are:


**Author Contributions:** Z.S. and E.A. modeled and solved the problem. Z.S. wrote the manuscript. M.J. and U.K. contributed in the numerical computations and plotting the graphical results. All the corresponding authors completed the manuscript after its internal evaluation. All authors have read and agreed to the published version of the manuscript.

**Funding:** This project was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, under grant No. (DF-143-130-1441).

**Acknowledgments:** The authors, therefore, gratefully acknowledge DSR for technical and financial support.

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