Note on “Mass transfer by free convection at inclined electrodes” by M. G. Fouad and A. M. Ahmed

✍ Scribed by U. Böhm

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 188 KB
• Volume: 15
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(70)90067-8

✦ Synopsis

FOUAD and Ahmed,l studying natural convection mass transfer at inclined electrodes, obtained nine equations, one for each of the angles of inclination investigated, which they combined in the general correlation Nu = O-3 (CScGr)O'=', (1)

As the constant C depends on the angle of inclination, the correlation is not general and cannot be applied for any angle for which C has not been listed. Furthermore, it has to be pointed out that the use of a general equation ( 1) for all positions of the electrode is invalid because of the presence of two different mechanisms as described below.

Case (1)

This includes vertical electrodes and the inclined positions when the density gradient and the gravity force have the same sense, ie the less dense liquid is above the denser one, which condition is fulfilled in the metal deposition investigated by Fouad and Ahmed when the cathode is facing downwards.

In this case laminar flow conditions along the electrode are to be expected. The only effect of tilting the electrode is to diminish the component of the gravitational force in the direction of the electrode surface;