Dear Dr. Adel

Kind regards..

In dealing with heat pipes charged with a nanofluid, you should consider the following points:-

1- The ability of the generated vapor inside the heat pipe to carry the nano-particles from the evaporator to the condenser sections.

2- The nano-particles should not settle down at the evaporator bottom due to gravity.

3- Heat pipe length is an important factor because long pipe may prevent successful circulation of nano-particles.

Wishing you all the best in your endeavor..

Yours Sincerely .. Aouf A. Al-Tabbakh

You can find some useful information in the following review papers:

http://www.sciencedirect.com/science/article/pii/S187661021403046X

http://www.sciencedirect.com/science/article/pii/S1876610217300668

• Thank you very much for the valuable information.