화학공학소재연구정보센터
International Journal of Heat and Mass Transfer, Vol.42, No.10, 1747-1755, 1999
EHD-assisted external condensation of R-134a on smooth horizontal and vertical tubes
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.