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Determination of the adhesion energy of liquid droplets on a hydrophobic flat surface considering the contact area.pdf

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International Journal of Heat and Mass Transfer 102 (2016) 826–832 Contents lists available at ScienceDirect International Journal of Heat and Mass Transfer journal homepage: /locate/ijhmt Determination of the adhesion energy of liquid droplets on a hydrophobic ?at surface considering the contact area Yong Hwan Kim, Kiwook Kim, Ji Hwan Jeong ? School of Mechanical Engineering, Pusan National University, Jangjeon-Dong, Geumjeong-Gu, Busan 609-735, Republic of Korea article info Article history: Received 26 December 2015 Received in revised form 25 June 2016 Accepted 27 June 2016 Available online 9 July 2016 Keywords: Contact angle Dropwise condensation Adhesion energy Hydrophobic surface abstract The formation of liquid droplets on a hydrophobic surface and continuous droplet removal is bene?cial in the design of various engineering devices. A liquid droplet on an inclined hydrophobic surface may roll down or attach to the surface depending on the balance among the associated forces. A series of experiments is performed in order to measure the inclination angle of a hydrophobic surface that makes a liquid droplet begin to slide or roll down. Various sizes of sessile drops of deionized water, ethylene glycol, and methylene iodide are examined. The existing adhesion force models have not been successful in predicting the sliding angle because they do not consider the area where the liquid droplet and solid surface are in contact with each other, but rather they consider the length of the periphery of the contact area. In this study, a new method to predict the adhesion energy of a droplet on a ?at solid surface is proposed. The proposed method is based on the relationship between the solid and liquid contact area using moment of force analyses. Analyzing the experimental data using the proposed method, the adhesion energy per unit area is evaluated to have a constant value regardless of the droplet volume. The new definition of adhesion energy per unit area is appropri