Enhancement of condensation heat transfer on a finned tube using an electric field - Effects of electrode coating

In the present paper, an attempt is made to develop an effective EHD enhanc ement technique for condensation heat transfer of steam around a horizontal finned tube. The main idea in the present study is to reduce the power con sumption by using a partially-coated electrode, and the experimental data o n heat transfer coefficients and flooding angles are presented. The results indicate that, by using such an electrode, the enhancement ratio remains a t almost the same level as that of a bare electrode but the power consumpti on can be markedly decreased. Within the present experimental range, the co ndensation heat transfer coefficient on the finned tube with the partially- coated electrode reaches a value about 3 times larger than that without the electrode. In addition, a model is presented for the EHD effect on the flo oding angle, and it was confirmed that the prediction from the model is in good agreement with the experimental data.