A one dimensional semi analysis model was developed based on accommodation theory to study the effect of electric field on liquid wetting characteristics in vertical rectangular capillary microgrooves heat sinks. The effects of electric field intensity

heat flux and microgrooves dimensions on liquid wetting characteristics are investigated. The results show that the electric field can be utilized to improve the wetting length of liquid in microgrooves heat sinks. The wetting length decreases with heat flux under the electric field effect. When the heat flux is relatively small

the enhancement of the wetting length due to the electric field intensity is higher

yet the enhancement due to the electric field decreases with the heat flux. The accommodation length and the corner flow length under the action of electric field are studied and compared. Both the accommodation length and the corner flow length increase with the increasing electric field intensity yet the enhancement in corner flow length is more distinguished. Since the liquid film in the corner flow stage is thinner than the accommodation stage

according to thin film theory

the enhancement of the corner flow length is important to the heat transfer enhancement of the rectangular microgrooves. Effects of microgroove dimensions on wetting length under electric field effect are considered. The length of wetting under the action of electric field increases and decreases with the increase of groove depth and groove width. Compared with microgrooves with smaller depth and width

when the groove size is larger

the electric field strength is more significant for with the liquid wetting strengthening in the microgrooves.