Research output: Contribution to journal › Article › peer-review
Impact of graphene coating created by dipping technique on film-wise condensation. / Barakhovskaia, Ella; Glushchuk, Andrey; Iermano, Fabio et al.
In: Applied Thermal Engineering, Vol. 223, 120007, 25.03.2023.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Impact of graphene coating created by dipping technique on film-wise condensation
AU - Barakhovskaia, Ella
AU - Glushchuk, Andrey
AU - Iermano, Fabio
AU - Iorio, Carlo Saverio
N1 - This work was done in the framework of HEAT TRANSFER PRODEX project and the financial support of the Belgian Federal Science Policy Office. We acknowledge the support from the GRAPHENE FLAGSHIP supported by the European Commission.
PY - 2023/3/25
Y1 - 2023/3/25
N2 - Film-wise condensation takes place in most heat exchangers since this mode is the most stable. Modifying cooled surfaces by applying coatings is trendy method to intensify heat transfer. In this work, a new concept allowing study the influence of surface coating on film-wise condensation is proposed. Reliable thermal data and accurate optical measurements of the condensate thickness distribution were obtained. The correctness of the concept was justified by the demonstration of good agreement between film thickness distributions measured for the uncoated surface and classical Nusselt's theory. Two types of the coating were created and tested as condensers’ surfaces. The first surface has a roughness of 18 µm filled with graphene, did not provide any condensation enhancement. The second coating consisted of the filled roughness of 10 µm and a several graphene layers, demonstrated two times enhancement of the film-wise condensation. For the first time, the impact of the graphene-based coating on film-wise vapour condensation was found when the condensate thickness is comparable with coating. In other words, the level of intensification depends on the technological parameters used to create the coatings.
AB - Film-wise condensation takes place in most heat exchangers since this mode is the most stable. Modifying cooled surfaces by applying coatings is trendy method to intensify heat transfer. In this work, a new concept allowing study the influence of surface coating on film-wise condensation is proposed. Reliable thermal data and accurate optical measurements of the condensate thickness distribution were obtained. The correctness of the concept was justified by the demonstration of good agreement between film thickness distributions measured for the uncoated surface and classical Nusselt's theory. Two types of the coating were created and tested as condensers’ surfaces. The first surface has a roughness of 18 µm filled with graphene, did not provide any condensation enhancement. The second coating consisted of the filled roughness of 10 µm and a several graphene layers, demonstrated two times enhancement of the film-wise condensation. For the first time, the impact of the graphene-based coating on film-wise vapour condensation was found when the condensate thickness is comparable with coating. In other words, the level of intensification depends on the technological parameters used to create the coatings.
KW - Film-wise condensation
KW - Graphene
KW - Heat transfer coefficient
KW - Heat transfer enhancement
KW - Multilayer coating
UR - https://www.scopus.com/inward/record.url?eid=2-s2.0-85146015166&partnerID=40&md5=66907b12c1465f7edae8621375364624
UR - https://www.mendeley.com/catalogue/6df3f7b6-9cc6-3eaf-880c-4fdc810973d5/
U2 - 10.1016/j.applthermaleng.2023.120007
DO - 10.1016/j.applthermaleng.2023.120007
M3 - Article
VL - 223
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
SN - 1359-4311
M1 - 120007
ER -
ID: 49448691