Water bridge can affect the performance of fin-and-tube heat exchanger working under dehumidifying. In order to know the influence of water bridge on heat exchanger

the shape of water bridge needs to be studied. In this research

a visual experiment was used to develop the prediction model of water bridge shape. Based on the visual experiment

the contact line and the contact angles of water bridge were measured

covering various water volumes

solid plate separations and five different solid materials. The prediction model of contact line via correlated aspect ratio was developed

and the prediction model of contact angles via the correlated maximum and minimum contact angles was proposed. The mean deviation of aspect ratio of contact line was 3.4% and that of contact angles was 7.9%.