Fernández de Arroiabe, PeruMartinez-Urrutia, AsierPeña, XabierMartinez-Agirre, ManexBou-Ali, M. Mounir2018-06Fernández de Arroiabe , P , Martinez-Urrutia , A , Peña , X , Martinez-Agirre , M & Bou-Ali , M M 2018 , ' Influence of the contact angle on the wettability of horizontal-tube falling films in the droplet and jet flow modes ' , International Journal of Refrigeration , vol. unknown , pp. 12-21 . https://doi.org/10.1016/j.ijrefrig.2018.04.0030140-7007researchoutputwizard: 11556/542Publisher Copyright: © 2018 Elsevier Ltd and IIRWettability has a key impact on the performance of LiBr-H2O horizontal-tube falling film absorbers working under typical operating conditions. Therefore, it is necessary to study the influence of the wettability properties on the film hydrodynamics and wetted area. This work analyses the influence of the contact angle (0° – 120°) on the transient film hydrodynamics and the wetted area in the droplet and jet flow modes (7 ≤ Re ≤ 53). The comparison between two-dimensional and three-dimensional models evidences that three-dimensional models are needed for incomplete wetting conditions. The influence of the contact angle on both the film hydrodynamics and wetted area is demonstrated using 3D unsteady CFD model. Furthermore, the results indicate that each Reynolds number has a maximum contact angle to wet the whole tube steadily. When the value of the contact angle is lower than this maximum value, the contact angle has not influence on the wetting ratio. In contrast, at higher values, the wetting ratio decreases as the contact angle increases.102540438enginfo:eu-repo/semantics/restrictedAccessjournal article10.1016/j.ijrefrig.2018.04.003Absorption technologiesWater-lithium bromideFalling filmContact angleWettabilityCFDAbsorption technologiesWater-lithium bromideFalling filmContact angleWettabilityCFDBuilding and ConstructionMechanical EngineeringFunding InfoThe authors would like to express their gratitude for the support of BEROA-GO 3.0 and research groups (No. IT009-16)The authors would like to express their gratitude for the support of BEROA-GO 3.0 and research groups (No. IT009-16)http://www.scopus.com/inward/record.url?scp=85047239388&partnerID=8YFLogxK