ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
THEORETICAL INVESTIGATION OF THE EFFECT OF AN ELECTRIC FIELD UPON VERTICAL PLATE CONDENSATION HEAT TRANSFER
Sinopsis
The effect of electric fields on film-wise
condensation on vertical plates, has been reported
by several researchers. Electric forces are found
to cause instability of the vapour-liquid inter-phase
resulting in droplet formation and reduction
of the thickness of the condensate film. Thus they
remarkably enhance the condensation heat transfer
coefficient. In previous papers these phenomena
were described only in a qualitative way, making
use of experimental data.
The aim of this paper is to present a theoretical model for this phenomenon. Combining results of electrohydrodynamical and capillary instability of falling liquid films, the size of the droplets and the distance between them is determined. From this the decrease in condensate film thickness is obtained. The increase of the heat transfer coefficient as a function of the electric field strength and the physical parameters of the fluid then can be derived. A comparison is made with experimental data.
The aim of this paper is to present a theoretical model for this phenomenon. Combining results of electrohydrodynamical and capillary instability of falling liquid films, the size of the droplets and the distance between them is determined. From this the decrease in condensate film thickness is obtained. The increase of the heat transfer coefficient as a function of the electric field strength and the physical parameters of the fluid then can be derived. A comparison is made with experimental data.