Contact angle measurement for LiBr aqueous solutions on different surface materials used in absorption systems
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2018-11
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Abstract
Wetting surface is a very important issue for the design of absorption applications and heat exchangers. The contact angle is deemed essential in wettability studies; However, LiBr aqueous solution contact angle studies are limited. This work analyses the contact angle of LiBr aqueous solution in the range of 0–55% mass fraction on different material surfaces: copper, aluminum, stainless-steel and polytetrafluoroethylene (PTFE) under atmospheric conditions. A sessile drop technique was used for measuring the contact angles, and a linear relation between solution surface tension and contact angle is observed in the tested materials. The study of three metals show hydrophilic performance (θ < 90°), whereas the PTFE shows hydrophobic performance. Additionally, the effect of the selection of the material, and consequent effect on the contact angle, on the minimum wetting rate and film thicknesses is presented under the working conditions of the absorption technologies. From the wettability point of view, the results show that using stainless-steel and aluminum leads to a slightly better performance than a copper made heat exchanger.
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Publisher Copyright: © 2018 The Authors
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Contact-angle , Sessile-drop-test , Absorption technologies , Falling-film , Wetting , Contact-angle , Sessile-drop-test , Absorption technologies , Falling-film , Wetting , Building and Construction , Mechanical Engineering , Project ID , info:eu-repo/grantAgreement/EC/H2020/680738/EU/ndustrial Energy and Environment Efficiency/INDUS3ES , info:eu-repo/grantAgreement/EC/H2020/680738/EU/ndustrial Energy and Environment Efficiency/INDUS3ES , Funding Info , The authors would like to thank the support of the project Indus3Es: Industrial Energy_x000D_ and Environmental Efficiency funded by the Horizon 2020 framework of the European Union,_x000D_ Project No. 680738. The authors would also like to express their gratitude for the support_x000D_ of MICRO4FAB and BEROA–GO 3.0 and Research Groups (No. IT009-16). , The authors would like to thank the support of the project Indus3Es: Industrial Energy_x000D_ and Environmental Efficiency funded by the Horizon 2020 framework of the European Union,_x000D_ Project No. 680738. The authors would also like to express their gratitude for the support_x000D_ of MICRO4FAB and BEROA–GO 3.0 and Research Groups (No. IT009-16).
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Martinez-Urrutia , A , Fernández de Arroiabe , P , Ramirez , M , Martinez-Agirre , M & Mounir Bou-Ali , M 2018 , ' Contact angle measurement for LiBr aqueous solutions on different surface materials used in absorption systems ' , International Journal of Refrigeration , vol. 95 , pp. 182-188 . https://doi.org/10.1016/j.ijrefrig.2018.05.041