RT Journal Article ID 0729b8f72ac27874 A1 Wang, Guoshan A1 Bao, Ran T1 HEAT TRANSFER AUGMENTATION OF A TRANSFORMER OIL FLOW IN A SMOOTH TUBE BY EHD EFFECT UNDER HIGH TEMPERATURES JF Journal of Enhanced Heat Transfer JO JEH(T) YR 2011 FD 2011-04-20 VO 18 IS 2 SP 107 OP 114 K1 enhanced heat transfer K1 electrohydrodynamics K1 convective heat transfer K1 oil AB An experimental investigation was performed to understand the electrohydrodynamic (EHD) enhancing effect on laminar forced convective heat transfer of transformer oil. The experiment was carried out in a horizontally positioned smooth tube with an inner diameter of 30 mm under high-temperature conditions. Experimental results show that a high electric voltage applied can exert a strong enhancing effect on the heat transfer, but will cause only small augmentation on the friction factor. The heat transfer enhancement increases rapidly with the increase of the electric voltage applied, and then it seems gradually to approach a saturated maximum value. Also, the oil temperature has a great influence on the heat transfer enhancement and the enhancement ratio increases with the increase of the oil temperature. The average enhancement ratio of the heat transfer coefficient can exceed 6 under 8.0 kV voltages applied, while that of the average friction factor approaches only 1.5. PB Begell House LK https://www.dl.begellhouse.com/journals/4c8f5faa331b09ea,3a58938b34f636c7,0729b8f72ac27874.html