Abstract
In this paper, results of an experimental study on the EHD-assisted external condensation of R-134 over a plain tube will be presented and discussed. The experiments performed can be divided into two groups: (1) EHD-assisted external condensation on a vertical smooth tube and (2) EHD-assisted external condensation experiments on a horizontal smooth tube. In each case, experiments were conducted as a function of parametric values such as heat flux, electrode gaps and applied electric field potential. All of the experiments were conducted using a specially designed helical electrode and with R-134a as the working fluid. Experimental results demonstrate a remarkable potential in utilizing EHD to enhance external condensation heat transfer. It is concluded that the enhancement is driven by the effective removal of the condensate through EHD-induced liquid extraction and dispersion phenomena.
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