Modelling study on freezing process of water droplet on inclined cold plate surface with droplet dynamic behavior considered. (15th November 2022)

• Record Type: Journal Article
• Authors: Dang, Qun; Song, Mengjie; Zhang, Xuan; Pekař, Libor; Hosseini, Seyyed Hossein
• Is Part Of: International journal of heat and mass transfer. Volume 197(2022)
• Publication Date: 2022-11-15
• Subjects: Sessile water droplet -- Inclined surface -- Dynamic behavior -- Freezing process -- Modeling study; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2022.123327
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: A novel model is presented to calculate freezing process on inclined surface. The dynamic behavior of droplet on inclined surface is considered in this model. A high accuracy is reached at 95% when predicting the water droplet profiles. Critical angle which is the main condition of conical tip formation is presented. Abstract: Droplet freezing on inclined surfaces exists widely in engineering fields. To accurately predict and control the freezing process of a sessile water droplet on inclined surface, a theoretical model based on the heat-enthalpy method is presented in this study, with two types of dynamic behavior considered, deformation and spreading. After the validation of model by droplet profiles and freezing duration from experiments, the freezing characteristics are analyzed, including contact area, frozen height and vertex offset, etc. As found, the effect of inclined angle on less than 10.34 µL water droplet is greater than that on larger than 10.34 µL droplet, due to the mutual relation between surface tension and gravity effect. When the inclined angle of surface changes from 0° to 40°, the contact area keeps at 11.61 mm 2 for 10 µL water droplet, and increases by 5.64% from 23.04 to 24.34 mm 2 for 25 µL water droplet. The initial heights of 10 and 25 µL water droplets decrease by 0.85% from 1.18 mm to 1.17 mm and by 1.91% from 1.51 mm to 1.49 mm, respectively. That means it is easier frozen for the same water droplet on bigger inclined angle surface. This study is beneficial for the optimization of anti-frosting and defrosting technologies.